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EP2281075B1 - Device for use in a method for the production of a protective layer and method for the production of a protective layer - Google Patents

Device for use in a method for the production of a protective layer and method for the production of a protective layer Download PDF

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Publication number
EP2281075B1
EP2281075B1 EP09757118A EP09757118A EP2281075B1 EP 2281075 B1 EP2281075 B1 EP 2281075B1 EP 09757118 A EP09757118 A EP 09757118A EP 09757118 A EP09757118 A EP 09757118A EP 2281075 B1 EP2281075 B1 EP 2281075B1
Authority
EP
European Patent Office
Prior art keywords
opening
component
material particles
receiving device
coated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
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EP09757118A
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German (de)
French (fr)
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EP2281075A2 (en
Inventor
Josef Linska
André Werner
Uwe Michel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MTU Aero Engines AG
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MTU Aero Engines GmbH
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Publication date
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Priority to PL09757118T priority Critical patent/PL2281075T3/en
Publication of EP2281075A2 publication Critical patent/EP2281075A2/en
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D15/00—Electrolytic or electrophoretic production of coatings containing embedded materials, e.g. particles, whiskers, wires
    • C25D15/02—Combined electrolytic and electrophoretic processes with charged materials
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/22—Servicing or operating apparatus or multistep processes
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/004—Sealing devices

Definitions

  • the present invention enters an apparatus for use in a process for the galvanic production of a hard material particles having protective layer on a component of a turbomachine, in particular a blade tip armor of a blade tip of a rotor blade.
  • the invention further relates to a method for the galvanic production of a hard material particles having protective layer on a component of a turbomachine, in particular a blade tip armor of a blade tip of a rotor blade.
  • the efficiency of the turbomachine is determined in particular by the rotor gap between the tips of the rotor blades and the rotor or the rotor blades facing wall of the rotor housing.
  • a so-called air seal is used, wherein the air seal defined by so-called inlet linings on the housing inner sides and correspondingly hard deposits on the blade tips.
  • hard-material particles are provided for coating the blade tips in an immersion bath having an electrolyte, which are applied to the corresponding blade tip during electroplating with the metallic matrix layer, in particular with a nickel layer.
  • the hard material particles are embedded in the galvanically applied metallic matrix layer.
  • a disadvantage of the known methods and devices that they are relatively expensive, since among other things structurally complex devices are used for the galvanization process.
  • very high amounts of hard material particles are used to achieve the desired concentrations on the blade tips.
  • Hard material particles, such as (cubic) boron nitride hard particles are very expensive, so that the application of the known methods is very expensive overall.
  • US3980549 discloses an apparatus for use in a process for electroplating a boron nitride particulate protective nickel layer on a component having an elastic, bag-like receptacle for receiving the hard particles and which is smaller than the diameter of a reticulated mesh-permeable material permeable to an electrochemical coating solution the hard material particles consists.
  • the receiving device is designed such that it can be detachably attached to an opening above and around a region of the component to be coated. By attaching the receiving device over or around the region of the component to be coated, a defined amount of hard material particles for the coating can be provided.
  • the opening of the receiving device is surrounded by a flexible seal.
  • the seal is laminated in the edge of the opening.
  • the design of a flexible seal at the edge of the opening of the receiving device it can be securely attached to the component to be coated, for example, a blade tip of a rotor readily.
  • the formation of a seal also ensures that the hard material particles are applied only in the actual areas of the component to be coated.
  • the receiving device is connected in the region of its opening with a top base plate, such that the opening corresponds to an opening in the top base plate and the top base plate is releasably secured to a cover.
  • the cover has at least one mold opening for receiving the regions of the component to be coated, wherein the opening of the attachment base plate is positioned with the opening of the receiving device over these areas.
  • the opening of the attachment base plate can be surrounded by at least one seal. This also ensures that the hard particles are actually provided only in the areas of the component to be coated.
  • at least one fixing pin for insertion into a corresponding fixing opening of the cover may be formed on the opposite side of the receiving device of the attachment base plate. This ensures a precise, simple and secure positioning of the receiving device on the cover.
  • the cover has at least one fixing device for releasably securing the cover to the component. This also makes it possible to securely position the cover on the desired component surfaces. Furthermore, it is possible that between the attachment base plate and the mold opening a form-fitting surrounding the opening seal is formed.
  • the hard material particles may consist of (cubic) Bohrnitrid, ceramic, titanium carbide, tungsten carbide, chromium carbide, aluminum oxide or zirconium oxide or a mixture thereof.
  • the particle size is usually between 30 to 200 microns, but other particle sizes can also be used.
  • the cover can be rigid or flexible.
  • the inventive method ensures a simplified and cost-effective process flow.
  • a sufficiently high concentration of hard material particles is provided for the coating without these being distributed freely and uncontrollably in the electrochemical coating solution.
  • the attachment of the receiving device over and around the area to be coated of the component is procedurally easy to perform.
  • unneeded hard material particles remain in the receiving device.
  • This can then readily be used for a next coating step, provided that the concentration of hard material particles is still sufficient.
  • the receiving device consists of a permeable material for the electrochemical coating solution
  • the galvanic process ie the formation of a metallic matrix layer, in particular a nickel-containing layer on the region to be coated of the component under embedding of the hard material particles is not hindered.
  • the galvanic forming of the filling layer between the embedded hard material particles according to method step c) can be carried out, for example, after removal of the receiving device.
  • a rotation of the component wherein the axis of rotation of the component is horizontal.
  • the rotational movement of the component ensures a uniform distribution of the hard material particles on the component surface to be coated. Due to gravity, the hard material particles are pressed in an upper position of the rotating component against the component surface to be coated.
  • the component is completely introduced into the immersion bath with the electrochemical coating solution. But it is also possible that the component is only partially or partially immersed in the galvanic immersion bath.
  • integrally bladed rotor disks or rotor rings BLISK or BLING
  • the rotation of the BLISK or BLING with horizontally oriented rotation axis results in the desired uniform distribution of the hard material particles on the blade tips.
  • the receiving device with the opening is positively placed over the region of the component to be coated, wherein the opening is surrounded by a flexible seal.
  • the flexible seal can be laminated in the edge of the opening.
  • the receiving device is connected in the region of its opening with a top base plate, such that the opening of the receiving device corresponds to an opening in the top base plate and the top base plate is detachably fastened to a cover.
  • the cover has at least one mold opening for receiving the regions of the component to be coated, wherein in step a) the opening of the sales base plate is positioned with the opening of the receiving device over these areas.
  • This process step also ensures that only predetermined regions of the component are coated with the protective layer having the hard material particles.
  • the components or component areas to be coated can be positioned in a form-fitting manner quickly and easily by means of the mentioned mold openings in the cover.
  • the cover is releasably secured to the component prior to method step a).
  • the cover can be designed such that it can accommodate one or more component areas to be coated in corresponding mold openings.
  • the cover can be flexible or rigid.
  • the electrochemical coating solution used in process step b) and / or process step c) contains nickel.
  • it may be a nickel sulfamate solution.
  • a massive nickel anode is used for the projecting into the galvanic immersion anode.
  • Other metallic coating materials are conceivable and are in particular based on the metallic composition of the component to be coated.
  • the hard material particles used usually consist of (cubic) Bohrnitrid, ceramic, titanium carbide, tungsten carbide, chromium carbide, alumina or zirconia or a mixture thereof. Typical particle sizes of the hard material particles used are between 30 .mu.m and 200 .mu.m. Other grain sizes are usable.
  • the filling layer formed in method step c) fills the intermediate space between the hard material particles, the hard material particles being geometrically integrated in the filling layer in a range between 65 and 90%.
  • an inventive component is produced according to a method described above, wherein the component is in particular a blade tip of a blade of a compressor of an aircraft engine, in particular a BLISK or BLING.
  • These bladed disks or rings consist in particular of titanium or nickel alloys.
  • these components are made of titanium-based metal matrix composites.
  • these components consist of so-called intermetallic materials of the TiAl or Ti 3 Al type.
  • FIG. 1 shows a schematic representation of an apparatus 10 for use in a process for the galvanic production of a hard material particles having protective layer on a component 38 of a turbomachine.
  • this is a blade tip armor of a blade tip 34 of a rotor blade 42.
  • the device 10 is a bag-like receiving device 12 for receiving the hard material particles 14 (see. FIG. 2 ), wherein the receiving device 12 from a net, screen or nonwoven, permeable to an electrochemical coating solution material with a mesh size which is smaller than the diameter of the hard particles 14 is.
  • the receiving device 10 is designed such that it with an opening 16 (see. FIG.
  • the receiving device 12 is connected in the region of its opening 16 with a top base plate 18, wherein the opening 16 with an opening 20 in the top base plate 18 corresponds.
  • the attachment base plate 18 is releasably attached to a cover 24.
  • the attachment takes place in the illustrated embodiment by fixing pins 28 which are arranged on the receiving device 12 opposite side of the attachment base plate 18 and in corresponding fixing openings 30 of the cover 24 are inserted (see. Fig. 2 ).
  • the cover 24 has a plurality of mold openings 26 for receiving the blade tips 34 or the areas 40 of the component 38 to be coated.
  • the opening 20 of the attachment base plate 18 with the opening 16 of the receiving device 12 is positioned over the blade tips 34 or the areas 40 to be coated.
  • the individual mold openings 26 are surrounded by a respective seal 36 in a form-fitting manner.
  • the seal 36 comes to lie between the top base plate 18 and the cover 24.
  • the seal 36 is usually made of wax or rubber.
  • fixing devices 32 are formed for releasably securing the cover 24 to the component 38.
  • the blade tip 34 of the rotor blade 42 to be coated in the illustrated embodiment consists of a titanium alloy.
  • FIG. 2 shows a schematic representation of the receiving device 12. It can be seen that in the bag and fleece-like receiving device 12, the hard material particles 14 are concentrated. The hard material particles 14 usually consist of cubic boron nitride. Furthermore, it can be seen that the opening 16 of the receiving device 12 is connected to the attachment base plate 18, such that the opening 16 corresponds to the opening 20 in the attachment base plate 18. In addition, it is clear that the opening 20 in the attachment base plate is surrounded by a seal 22. In addition, the two fixing pins 28 are arranged on the attachment base plate 18.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Making Paper Articles (AREA)

Description

Die vorliegende Erfindung betritt eine Vorrichtung zur Verwendung in einem Verfahren zur galvanischen Herstellung einer Hartstoffpartikel aufweisenden Schutzschicht auf einem Bauteil einer Strömungsmaschine, insbesondere einer Schaufelspitzenpanzerung einer Schaufelspitze einer Rotorschaufel. Die Erfindung betrifft weiterhin ein Verfahren zur galvanischen Herstellung einer Hartstoffpartikel aufweisenden Schutzschicht auf einem Bauteil einer Strömungsmaschine, insbesondere einer Schaufelspitzenpanzerung einer Schaufelspitze einer Rotorschaufel.The present invention enters an apparatus for use in a process for the galvanic production of a hard material particles having protective layer on a component of a turbomachine, in particular a blade tip armor of a blade tip of a rotor blade. The invention further relates to a method for the galvanic production of a hard material particles having protective layer on a component of a turbomachine, in particular a blade tip armor of a blade tip of a rotor blade.

Zur Steigerung des Wirkungsgrads, der Leistung und der Lebensdauer von Strömungsmaschinen, insbesondere von Gasturbinen im Triebwerksbau werden die Bauteiloberflächen zunehmend mit unterschiedlichen Beschichtungen versehen. Dadurch ergibt sich im Triebwerksbau eine jeweils verbesserte Aerodynamik, höhere mögliche Verbrennungstemperaturen und höhere mögliche mechanische Beanspruchungen der einzelnen Bauteile. So wird zum Beispiel der Wirkungsgrad der Strömungsmaschine insbesondere durch den Rotorspalt zwischen den Spitzen der Rotorschaufeln und der dem Rotor bzw. den Rotorschaufeln zugewandten Wand des Rotorgehäuses mitbestimmt. Um diesen Spalt möglichst gering zu halten, wird eine so genannte Luftdichtung verwendet, wobei sich die Luftdichtung aus so genannten Einlaufbelägen an den Gehäuseinnenseiten und entsprechend harten Belägen auf den Schaufelspitzen definiert. Durch die Aufbringung einer so genannten Schaufelspitzenpanzerung reduziert sich der Verschleiß an der Schaufelspitze beim so genannten Einlaufen in den Einlaufbelag signifikant. Bei Turbinenschaufeln ist das galvanische Aufbringen von Schleifpartikeln durch Galvanisieren bekannt. Entsprechende Verfahren werden in der US-A-5665217 , derTo increase the efficiency, the performance and the service life of turbomachines, in particular of gas turbines in engine construction, the component surfaces are increasingly provided with different coatings. This results in an improved aerodynamics in the engine, higher possible combustion temperatures and higher possible mechanical stresses of the individual components. Thus, for example, the efficiency of the turbomachine is determined in particular by the rotor gap between the tips of the rotor blades and the rotor or the rotor blades facing wall of the rotor housing. In order to keep this gap as small as possible, a so-called air seal is used, wherein the air seal defined by so-called inlet linings on the housing inner sides and correspondingly hard deposits on the blade tips. The application of a so-called blade tip armor reduces the wear on the blade tip during so-called running into the inlet lining significantly. In the case of turbine blades, the galvanic application of abrasive particles by galvanizing is known. Appropriate procedures are in the US-A-5665217 , of the

US-A-5437724 und der US-A-5074970 beschrieben. Dabei werden zur Beschichtung der Schaufelspitzen in einem einen Elektrolyt aufweisenden Tauchbad Hartstoffpartikel bereitgestellt, die während des Galvanisierens mit der metallischen Matrixschicht, insbesondere mit einer Nickelschicht auf die entsprechende Schaufelspitze aufgebracht werden. Dabei erfolgt ein Einbetten der Hartstoffpartikel in die galvanisch aufgetragene metallische Matrixschicht. Nachteilig an dem bekannten Verfahren und Vorrichtungen ist jedoch, dass diese relativ aufwändig sind, da unter anderem konstruktiv aufwändige Vorrichtungen für den Galvanisierungsvorgang verwendet werden. Des Weiteren werden sehr hohe Mengen an Hartstoffpartikeln verwendet, um die gewünschten Konzentrationen auf den Schaufelspitzen zu erreichen. Hartstoffpartikel, wie zum Beispiel Hartstoffpartikel aus (kubischen) Bornitrid sind jedoch sehr teuer, so dass die Anwendung der bekannten Verfahren insgesamt sehr teuer ist. Um diese Kosten zu verringern wurde gemäß der DE 3525079 Al versucht, die Hartstoffpartikel bzw. Schleifteilchen auf einem elektrisch nicht leitenden porösen Band anzuordnen. Nachteilig ist jedoch, dass die Schleifteilchen mittels einer Klebstoffschicht an dem Band befestigt sind und nach dem Galvanisieren und Aufbringen der Schleifteilchen auf der entsprechenden Bauteiloberfläche diese Klebeverbindung wieder getrennt werden muss. Dies ergibt einen relativ komplizierten Prozessablauf. US-A-5437724 and the US-A-5074970 described. In this case, hard-material particles are provided for coating the blade tips in an immersion bath having an electrolyte, which are applied to the corresponding blade tip during electroplating with the metallic matrix layer, in particular with a nickel layer. In this case, the hard material particles are embedded in the galvanically applied metallic matrix layer. A disadvantage of the known methods and devices, however, that they are relatively expensive, since among other things structurally complex devices are used for the galvanization process. Furthermore, very high amounts of hard material particles are used to achieve the desired concentrations on the blade tips. Hard material particles, such as (cubic) boron nitride hard particles, however, are very expensive, so that the application of the known methods is very expensive overall. To reduce these costs was in accordance with the DE 3525079 A1 Attempts to arrange the hard particles or abrasive particles on an electrically non-conductive porous tape. The disadvantage, however, is that the abrasive particles are attached to the belt by means of an adhesive layer and after the electroplating and application of the abrasive particles on the corresponding component surface, this adhesive bond must be separated again. This results in a relatively complicated process.

US3980549 offenbart eine Vorrichtung zur Verwendung in einem Verfahren zur galvanischen Herstellung einer Bornitridpartikel aufweisenden Schutznickelschicht auf einem Bauteil, die eine elastische, beutelartige Aufnahmevorrichtung zur Aufnahme der Hartstoffpartikel aufweist und aus einem netzartigen, für eine elektrochemische Beschichtunglösung durchlässigen material mit einer maschenweite die Kleiner ist als der Durchmesser der Hartstoffpartikel besteht. US3980549 discloses an apparatus for use in a process for electroplating a boron nitride particulate protective nickel layer on a component having an elastic, bag-like receptacle for receiving the hard particles and which is smaller than the diameter of a reticulated mesh-permeable material permeable to an electrochemical coating solution the hard material particles consists.

Es ist daher Aufgabe der vorliegenden Erfindung eine gattungsgemäße Vorrichtung zur Verwendung in einem Verfahren zur galvanischen Herstellung einer Hartstoffpartikel aufweisenden Schutzschicht auf einem Bauteil einer Strömungsmaschine, insbesondere einer Schaufelspitzenpanzerung einer Schaufelspitze einer Rotorschaufel bereitzustellen, die einen vereinfachten und kostengünstigeren Prozessablauf gewährleistet.It is therefore an object of the present invention to provide a generic device for use in a process for the galvanic production of a hard material particles having protective layer on a component of a turbomachine, in particular a blade tip armor of a blade tip of a rotor blade, which ensures a simplified and cost-effective process flow.

Es ist weiterhin Aufgabe der vorliegenden Erfindung ein gattungsgemäßes Verfahren zur galvanischen Herstellung einer Hartstoffpartikel aufweisenden Schutzschicht auf einem Bauteil einer Strömungsmaschine, insbesondere einer Schaufelspitzenpanzerung einer Schaufelspitze einer Rotorschaufel bereitzustellen, welches einen vereinfachten und kostengünstigeren Prozessablauf gewährleistet.It is another object of the present invention to provide a generic method for the galvanic production of a hard material particles having protective layer on a component of a turbomachine, in particular a blade tip armor of a blade tip of a rotor blade, which ensures a simplified and cost-effective process flow.

Gelöst werden diese Aufgaben durch eine Vorrichtung gemäß den Merkmalen des Anspruchs 1 sowie ein Verfahren gemäß den Merkmalen des Anspruchs 10.These objects are achieved by a device according to the features of claim 1 and a method according to the features of claim 10.

Vorteilhafte Ausgestaltungen der Erfindung sind in den jeweiligen Unteransprüchen beschrieben.Advantageous embodiments of the invention are described in the respective subclaims.

Eine erfindungsgemäße Vorrichtung zur Verwendung in einem Verfahren zur galvanischen Herstellung einer Hartstoffpartikel aufweisenden Schutzschicht auf einem Bauteil einer Strömungsmaschine, insbesondere einer Schaufelspitzenpanzerung einer Schaufelspitze einer Rotorschaufel umfasst eine beutel-, tüten- oder sackartige Aufnahmevorrichtung zur Aufnahme der Hartstoffpartikel, wobei die Aufnahmevorrichtung aus einem netz-, sieb- oder vliesartigen, für eine elektrochemische Beschichtungslösung durchlässigen Material mit einer Maschenweite die kleiner ist als der Durchmesser der Hartstoffpartikel besteht. Zudem ist die Aufnahmevorrichtung derart gestaltet, dass sie mit einer Öffnung über und um einen zu beschichteten Bereich des Bauteils lösbar anbringbar ist. Durch das Anbringen der Aufnahmevorrichtung über oder um den zu beschichtenden Bereich des Bauteils kann eine definierte Menge an Hartstoffpartikeln für die Beschichtung bereitgestellt werden. Ein unnötiger Verbrauch an Hartstoffpartikeln kann nicht erfolgen, da die Aufnahmevorrichtung möglicherweise nicht für die Beschichtung verwendete Hartstoffpartikel auffängt, so dass diese für einen nächsten Beschichtungsvorgang wieder verwendet werden können. Zudem kann das Anbringen der Aufnahmevorrichtung über und um den zu beschichtenden Bereich des Bauteils einfach und schnell erfolgen, so dass der Prozessablauf insgesamt sehr vereinfacht wird.A device according to the invention for use in a method for the galvanic production of a hard material particles protective layer on a component of a turbomachine, in particular a blade tip armor of a blade tip of a rotor blade comprises a bag, bag or bag-like receiving device for receiving the hard material particles, wherein the receiving device from a network , sieve-like or fleece-like, permeable to an electrochemical coating solution material with a mesh size which is smaller than the diameter of the hard material particles. In addition, the receiving device is designed such that it can be detachably attached to an opening above and around a region of the component to be coated. By attaching the receiving device over or around the region of the component to be coated, a defined amount of hard material particles for the coating can be provided. An unnecessary consumption of hard material particles can not take place, since the receiving device may not catch hard material particles used for the coating, so that they can be reused for a next coating process. In addition, attaching the receiving device over and around the area to be coated of the component can be done easily and quickly, so that the overall process flow is greatly simplified.

In vorteilhaften Ausgestaltungen der erfindungsgemäßen Vorrichtung ist die Öffnung der Aufnahmevorrichtung von einer flexiblen Dichtung umgeben. Insbesondere ist die Dichtung in den Rand der Öffnung einlaminiert. Durch die Ausgestaltung einer flexiblen Dichtung am Rand der Öffnung der Aufnahmevorrichtung kann diese ohne Weiteres an dem zu beschichtenden Bauteil, zum Beispiel einer Schaufelspitze eines Rotors sicher befestigt werden. Durch die Ausbildung einer Dichtung ist zudem gewährleistet, dass die Hartstoffpartikel nur in den tatsächlich zu beschichtenden Bereichen des Bauteils aufgebracht werden.In advantageous embodiments of the device according to the invention, the opening of the receiving device is surrounded by a flexible seal. In particular, the seal is laminated in the edge of the opening. The design of a flexible seal at the edge of the opening of the receiving device, it can be securely attached to the component to be coated, for example, a blade tip of a rotor readily. The formation of a seal also ensures that the hard material particles are applied only in the actual areas of the component to be coated.

In den erfindungsgemäßen Vorrichtung ist die Aufnahmevorrichtung im Bereich ihrer Öffnung mit einer Aufsatzgrundplatte verbunden, derart, dass die Öffnung mit einer Öffnung in der Aufsatzgrundplatte korrespondiert und die Aufsatzgrundplatte an einer Abdeckung lösbar befestigt ist. Dabei weist die Abdeckung mindestens eine Formöffnung zur Aufnahme der zu beschichtenden Bereiche des Bauteils auf, wobei die Öffnung der Aufsatzgrundplatte mit der Öffnung der Aufnahmevorrichtung über diesen Bereichen positioniert ist. Eine derartige Ausgestaltung der Vorrichtung gewährleistet eine sichere und definierte Aufnahme der zu beschichtenden Bereiche des Bauteils in der Abdeckung und eine entsprechende Positionierung der die Hartstoffpartikel enthaltenden Aufnahmevorrichtung über und um die zu beschichtenden Bereiche des Bauteils. Durch die Verwendung einer derartigen Aufnahmevorrichtung vereinfacht sich der Prozessablauf, da die Hartstoffpartikel enthaltende Aufnahmevorrichtung ohne Weiteres und sicher positioniert werden kann.In the device according to the invention the receiving device is connected in the region of its opening with a top base plate, such that the opening corresponds to an opening in the top base plate and the top base plate is releasably secured to a cover. In this case, the cover has at least one mold opening for receiving the regions of the component to be coated, wherein the opening of the attachment base plate is positioned with the opening of the receiving device over these areas. Such an embodiment of the device ensures a secure and defined recording of the areas of the component to be coated in the cover and a corresponding positioning of the recording device containing the hard material particles over and around the areas of the component to be coated. By using such a receiving device simplifies the process flow, since the receiving device containing hard material particles can be easily and safely positioned.

In weiteren vorteilhaften Ausgestaltungen der erfindungsgemäßen Vorrichtung kann die Öffnung der Aufsatzgrundplatte von mindestens einer Dichtung umgeben sein. Auch dies gewährleistet, dass die Hartstoffpartikel tatsächlich nur in den Bereichen des Bauteils, die zu beschichten sind, bereitgestellt werden. Zudem kann an der der Aufnahmevorrichtung gegenüberliegenden Seite der Aufsatzgrundplatte mindestens ein Fixierungsstift zur Einführung in eine entsprechende Fixieröffnung der Abdeckung ausgebildet sein. Dadurch wird eine exakte, einfache und sichere Positionierung der Aufnahmevorrichtung an der Abdeckung gewährleistet. In einer - weiteren Ausgestaltung der erfindungsgemäßen Vorrichtung weist die Abdeckung mindestens eine Fixiervorrichtung zur lösbaren Befestigung der Abdeckung an dem Bauteil auf. Auch hierdurch ist eine sichere Positionierung der Abdeckung an den gewünschten Bauteilflächen möglich. Des Weiteren ist es möglich, dass zwischen der Aufsatzgrundplatte und der Formöffnung eine die Öffnung formschlüssig umgebende Dichtung ausgebildet ist. Dadurch ist gewährleistet, dass die Hartstoffpartikel nur in den tatsächlich zu beschichtenden Bereichen des Bauteils mit Hilfe der galvanisch aufgetragenen metallischen Matrixschicht eingebettet werden. Die Hartstoffpartikel können dabei aus (kubischen) Bohrnitrid, Keramik, Titankarbid, Wolframkarbid, Chromkarbid, Aluminiumoxid oder Zirkonoxid oder einer Mischung davon bestehen. Die Partikelgröße beträgt üblicherweise zwischen 30 bis 200 µm, andere Partikelgrößen können jedoch auch verwendet werden. Die Abdeckung kann starr oder flexibel ausgebildet sein.In further advantageous embodiments of the device according to the invention, the opening of the attachment base plate can be surrounded by at least one seal. This also ensures that the hard particles are actually provided only in the areas of the component to be coated. In addition, at least one fixing pin for insertion into a corresponding fixing opening of the cover may be formed on the opposite side of the receiving device of the attachment base plate. This ensures a precise, simple and secure positioning of the receiving device on the cover. In a - further embodiment of the device according to the invention, the cover has at least one fixing device for releasably securing the cover to the component. This also makes it possible to securely position the cover on the desired component surfaces. Furthermore, it is possible that between the attachment base plate and the mold opening a form-fitting surrounding the opening seal is formed. This ensures that the hard material particles are embedded only in the areas of the component that are actually to be coated with the aid of the galvanically applied metallic matrix layer. The hard material particles may consist of (cubic) Bohrnitrid, ceramic, titanium carbide, tungsten carbide, chromium carbide, aluminum oxide or zirconium oxide or a mixture thereof. The particle size is usually between 30 to 200 microns, but other particle sizes can also be used. The cover can be rigid or flexible.

Ein erfindungsgemäßes Verfahren zur galvanischen Herstellung einer Hartstoffpartikel aufweisenden Schutzschicht auf einem Bauteil einer Strömungsmaschine, insbesondere einer Schaufelspitzenpanzerung einer Schaufelspitze einer Rotorschaufel umfasst folgende Schritte:

  1. a) Anbringen einer Öffnung einer mit Hartstoffpartikeln gefüllten, beutel-, tüten- oder sackartigen Aufnahmevorrichtung einer Vorrichtung über und um einen zu beschichtenden Bereich des Bauteils, wobei die Aufnahmevorrichtung aus einem netz-, sieb- oder vliesartigen, für eine elektrochemische Beschichtungslösung durchlässigen Material mit einer Maschenweite die kleiner ist als der Durchmesser der Hartstoffpartikel besteht;
  2. b) Einbringen von zumindest den zu beschichtenden Bereichen des Bauteils in ein Tauchbad mit der elektrochemischen Beschichtungslösung und Anlegen einer Spannung zur Bildung einer metallischen Matrixschicht zumindest an dem zu beschichtenden Bereich des Bauteils unter Einbettung der Hartstoffpartikel; und
  3. c) Galvanisches Ausbilden einer Füllschicht zwischen den eingebetteten Hartstoffpartikeln.
An inventive method for the galvanic production of a hard material particles having protective layer on a component of a turbomachine, in particular a blade tip armor of a blade tip of a rotor blade comprises the following steps:
  1. a) attaching an opening of a filled with hard particles, bag, bag or bag-like receiving device of a device over and around a region to be coated of the component, wherein the receiving device of a net, screen or fleece-like, permeable to an electrochemical coating solution material a mesh size smaller than the diameter of the hard particles;
  2. b) introducing at least the regions of the component to be coated into an immersion bath with the electrochemical coating solution and applying a voltage to form a metallic matrix layer at least on the region of the component to be coated while embedding the hard material particles; and
  3. c) Galvanic forming a filling layer between the embedded hard material particles.

Das erfindungsgemäße Verfahren gewährleistet einen vereinfachten und kostengünstigen Prozessablauf. Insbesondere wird eine genügend hohe Konzentration an Hartstoffpartikeln für die Beschichtung bereitgestellt ohne dass diese in der elektrochemischen Beschichtungslösung frei und unkontrolliert verteilt sind. Zudem ist das Anbringen der Aufnahmevorrichtung über und um den zu beschichtenden Bereich des Bauteils verfahrenstechnisch einfach durchzuführen. Bei dem erfindungsgemäßen Verfahren verbleiben nicht benötigte Hartstoffpartikel in der Aufnahmevorrichtung. Diese kann dann ohne weiteres für einen nächsten Beschichtungsschritt verwendet werden, sofern die Konzentration an Hartstoffpartikeln noch ausreichend ist. Dadurch dass die Aufnahmevorrichtung aus einem für die elektrochemische Beschichtungslösung durchlässigen Material besteht, wird der galvanische Vorgang, d. h. die Bildung einer metallischen Matrixschicht, insbesondere einer nickelhaltigen Schicht an dem zu beschichtenden Bereich des Bauteils unter Einbettung der Hartstoffpartikel nicht behindert. Das galvanische Ausbilden der Füllschicht zwischen den eingebetteten Hartstoffpartikeln gemäß dem Verfahrensschritt c) kann zum Beispiel nach einer Entfernung der Aufnahmevorrichtung durchgeführt werden.The inventive method ensures a simplified and cost-effective process flow. In particular, a sufficiently high concentration of hard material particles is provided for the coating without these being distributed freely and uncontrollably in the electrochemical coating solution. In addition, the attachment of the receiving device over and around the area to be coated of the component is procedurally easy to perform. In the method according to the invention unneeded hard material particles remain in the receiving device. This can then readily be used for a next coating step, provided that the concentration of hard material particles is still sufficient. The fact that the receiving device consists of a permeable material for the electrochemical coating solution, the galvanic process, ie the formation of a metallic matrix layer, in particular a nickel-containing layer on the region to be coated of the component under embedding of the hard material particles is not hindered. The galvanic forming of the filling layer between the embedded hard material particles according to method step c) can be carried out, for example, after removal of the receiving device.

In einer weiteren vorteilhaften Ausgestaltung des erfindungsgemäßen Verfahrens erfolgt im Verfahrensschritt c) ein Rotieren des Bauteils, wobei die Rotationsachse des Bauteils horizontal verläuft. Durch die Rotationsbewegung des Bauteils wird eine gleichmäßige Verteilung der Hartstoffpartikel auf der zu beschichtenden Bauteilfläche gewährleistet. Schwerkraftbedingt werden die Hartstoffpartikel in einer oberen Position des rotierenden Bauteils gegen die zu beschichtende Bauteiloberfläche gedrückt. Das Bauteil ist dabei komplett in das Tauchbad mit der elektrochemischen Beschichtungslösung eingebracht. Es ist aber auch möglich, dass das Bauteil nur teilweise bzw. abschnittsweise in das galvanische Tauchbad eintaucht. Insbesondere bei integral beschaufelten Rotorscheiben oder Rotorringen (BLISK oder BLING) ergibt sich durch die Rotation der BLISK oder BLING bei horizontal ausgerichteter Drehachse die gewünschte gleichmäßige Verteilung der Hartstoffpartikel auf den Schaufelspitzen.In a further advantageous embodiment of the method according to the invention takes place in step c), a rotation of the component, wherein the axis of rotation of the component is horizontal. The rotational movement of the component ensures a uniform distribution of the hard material particles on the component surface to be coated. Due to gravity, the hard material particles are pressed in an upper position of the rotating component against the component surface to be coated. The component is completely introduced into the immersion bath with the electrochemical coating solution. But it is also possible that the component is only partially or partially immersed in the galvanic immersion bath. Especially with integrally bladed rotor disks or rotor rings (BLISK or BLING), the rotation of the BLISK or BLING with horizontally oriented rotation axis results in the desired uniform distribution of the hard material particles on the blade tips.

In einer weiteren vorteilhaften Ausgestaltung des erfindungsgemäßen Verfahrens wird im Verfahrensschritt a) die Aufnahmevorrichtung mit der Öffnung formschlüssig über den zu beschichtenden Bereich des Bauteils gestülpt, wobei die Öffnung von einer flexiblen Dichtung umgeben ist. Die flexible Dichtung kann dabei in den Rand der Öffnung einlaminiert sein. Durch das formschlüssige Stülpen der Aufnahmevorrichtung über den zu beschichtenden Bauteilbereich ist gewährleistet, dass nur diese Bereiche, d. h. die gewünschten Bauteilbereiche beschichtet werden. Zudem kann der genannte Stülpvorgang einfach und schnell durchgeführt werden.In a further advantageous embodiment of the method according to the invention, in the method step a), the receiving device with the opening is positively placed over the region of the component to be coated, wherein the opening is surrounded by a flexible seal. The flexible seal can be laminated in the edge of the opening. The positive insertion of the receiving device over the component area to be coated ensures that only these areas, i. H. the desired component areas are coated. In addition, the mentioned Stülpvorgang can be easily and quickly performed.

In dem erfindungsgemäßen Verfahren ist die Aufnahmevorrichtung im Bereich ihrer Öffnung mit einer Aufsatzgrundplatte verbunden, derart, das die Öffnung der Aufnahmevorrichtung mit einer Öffnung in der Aufsatzgrundplatte korrespondiert und die Aufsatzgrundplatte an einer Abdeckung lösbar befestigbar ist. Die Abdeckung weist dabei mindestens eine Formöffnung zur Aufnahme der zu beschichtenden Bereiche des Bauteils auf, wobei im Verfahrensschritt a) die Öffnung der Absatzgrundplatte mit der Öffnung der Aufnahmevorrichtung über diesen Bereichen positioniert wird. Auch dieser Verfahrensschritt gewährleistet, dass nur vorbestimmte Bereiche des Bauteils mit der Hartstoffpartikel aufweisenden Schutzschicht beschichtet werden. Zudem können die zu beschichtenden Bauteile bzw. Bauteilbereiche schnell und einfach mittels der genannten Formöffnungen in der Abdeckung formschlüssig positioniert werden.In the method according to the invention the receiving device is connected in the region of its opening with a top base plate, such that the opening of the receiving device corresponds to an opening in the top base plate and the top base plate is detachably fastened to a cover. The cover has at least one mold opening for receiving the regions of the component to be coated, wherein in step a) the opening of the sales base plate is positioned with the opening of the receiving device over these areas. This process step also ensures that only predetermined regions of the component are coated with the protective layer having the hard material particles. In addition, the components or component areas to be coated can be positioned in a form-fitting manner quickly and easily by means of the mentioned mold openings in the cover.

In weiteren vorteilhaften Ausgestaltungen des erfindungsgemäßen Verfahrens wird die Abdeckung vor dem Verfahrensschritt a) an dem Bauteil lösbar befestigt. Dabei kann die Abdeckung derart ausgestaltet sein, dass sie einen oder mehrere zu beschichtende Bauteilbereiche in entsprechenden Formöffnungen aufnehmen kann. Zudem kann die Abdeckung flexibel oder starr ausgebildet sein.In further advantageous embodiments of the method according to the invention, the cover is releasably secured to the component prior to method step a). In this case, the cover can be designed such that it can accommodate one or more component areas to be coated in corresponding mold openings. In addition, the cover can be flexible or rigid.

In einer weiteren vorteilhaften Ausgestaltung des erfindungsgemäßen Verfahrens enthält die im Verfahrensschritt b) und/oder dem Verfahrensschritt c) verwendete elektrochemische Beschichtungslösung Nickel. Insbesondere kann es sich dabei um eine Nickelsulfamatlösung handeln. Es ist aber auch möglich, dass für die in das galvanische Tauchbad ragende Anode eine massive Nickelanode verwendet wird. Auch andere metallische Beschichtungsmaterialien sind denkbar und richten sich insbesondere nach der metallischen Zusammensetzung des zu beschichtenden Bauteils. Die verwendeten Hartstoffpartikel bestehen üblicherweise aus (kubischen) Bohrnitrid, Keramik, Titankarbid, Wolframkarbid, Chromkarbid, Aluminiumoxid oder Zirkonoxid oder einer Mischung davon. Typische Korngrößen der verwendeten Hartstoffpartikel liegen zwischen 30 µm und 200 µm. Auch andere Korngrößen sind verwendbar.In a further advantageous embodiment of the process according to the invention, the electrochemical coating solution used in process step b) and / or process step c) contains nickel. In particular, it may be a nickel sulfamate solution. But it is also possible that a massive nickel anode is used for the projecting into the galvanic immersion anode. Other metallic coating materials are conceivable and are in particular based on the metallic composition of the component to be coated. The hard material particles used usually consist of (cubic) Bohrnitrid, ceramic, titanium carbide, tungsten carbide, chromium carbide, alumina or zirconia or a mixture thereof. Typical particle sizes of the hard material particles used are between 30 .mu.m and 200 .mu.m. Other grain sizes are usable.

In einer weiteren vorteilhaften Ausgestaltung des erfindungsgemäßen Verfahrens füllt die im Verfahrensschritt c) gebildete Füllschicht den Zwischenraum zwischen den Hartstoffpartikel aus, wobei die Hartstoffpartikel geometrisch in einem Bereich zwischen 65 bis 90 % in die Füllschicht eingebunden sind. Dadurch ergibt sich vorteilhafterweise eine sichere Fixierung der Hartstoffpartikel in der metallischen Matrix, wobei zusätzlich gewährleistet ist, dass ein genügend großer Bereich der Hartstoffpartikel noch aus der sie umgebenden Matrix herausragt.In a further advantageous embodiment of the method according to the invention, the filling layer formed in method step c) fills the intermediate space between the hard material particles, the hard material particles being geometrically integrated in the filling layer in a range between 65 and 90%. This advantageously results in a secure fixation of the hard material particles in the metallic matrix, wherein it is additionally ensured that a sufficiently large area of the hard material particles still protrudes from the surrounding matrix.

In weiteren vorteilhaften Ausgestaltungen des erfindungsgemäßen Verfahrens erfolgt vor dem Verfahrensschritt a) eine Reinigung und/oder eine Abdeckung der Bauteile mit einer anschließenden Entfernung der Abdeckung in den zu beschichtenden Bereichen und/oder eine chemische Vorbehandlung zumindest der zu beschichtenden Bereiche des Bauteils. Diese Maßnahmen dienen dazu, dass sich die metallische Matrix der aufzutragenden Schutzschicht ohne weiteres mit der metallischen Bauteiloberfläche verbindet. Die Art der Vorbehandlung hängt dabei insbesondere von der Zusammensetzung des zu beschichtenden Bauteils ab. So kann die Vorbehandlung von Titanbauteilen zum Beispiel folgende Schritte umfassen:

  1. 1. Ätzen des Bauteils in einer sauren sowie fluoridhaltigen, Salpetersäure enthaltenden Lösung;
  2. 2. Aktivbeizen des geätzten Bauteils in einer zumindest Natriumnitrat oder Tetrafluorborsäure enthaltenden Lösung und
  3. 3. Aktivierung des aktiv gebeizten Bauteils in einem säurehaltigen Bad oder einem sauren nickelhaltigen Bad. Nach einer derartigen Vorbehandlung kann die Hartstoffpartikel enthaltende Schicht direkt aufgebracht werden.
In further advantageous embodiments of the method according to the invention takes place before the process step a) cleaning and / or covering of the components with a subsequent removal of the cover in the areas to be coated and / or chemical pretreatment of at least the areas to be coated of the component. These measures serve to ensure that the metallic matrix of the protective layer to be applied readily bonds to the metallic component surface. The type of pretreatment depends in particular on the composition of the component to be coated. For example, the pretreatment of titanium components may include the following steps:
  1. 1. etching the component in an acidic and fluoride-containing solution containing nitric acid;
  2. 2. Active etching of the etched component in a solution containing at least sodium nitrate or tetrafluoroboric acid, and
  3. 3. Activation of the actively pickled component in an acidic bath or acidic nickel-containing bath. After such pretreatment, the layer containing the hard material particles can be applied directly.

Ein erfindungsgemäßes Bauteil ist hergestellt nach einem im Vorhergehenden beschriebenen Verfahren, wobei das Bauteil insbesondere eine Schaufelspitze einer Laufschaufel eines Verdichters eines Flugtriebwerks, insbesondere einer BLISK oder BLING ist. Diese beschaufelten Scheiben oder Ringe bestehen dabei insbesondere aus Titan- oder Nickellegierungen. Es ist aber auch möglich, dass diese Bauteile aus Metallmatrix-Verbundwerkstoffen auf Titanbasis hergestellt sind. Des Weiteren besteht die Möglichkeit, dass diese Bauteile aus so genannten intermetallischen Werkstoffen vom Typ TiAl oder Ti3Al bestehen.An inventive component is produced according to a method described above, wherein the component is in particular a blade tip of a blade of a compressor of an aircraft engine, in particular a BLISK or BLING. These bladed disks or rings consist in particular of titanium or nickel alloys. However, it is also possible that these components are made of titanium-based metal matrix composites. Furthermore, there is the possibility that these components consist of so-called intermetallic materials of the TiAl or Ti 3 Al type.

Weitere Vorteile, Merkmale und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung eines zeichnerisch dargestellten Ausführungsbeispiels. Es zeigen

  • Figur 1 eine schematische Darstellung einer erfindungsgemäßen Vorrichtung; und
  • Figur 2 eine schematische Darstellung einer Aufnahmevorrichtung der erfindungsgemäßen Vorrichtung gemäß Figur 1.
Further advantages, features and details of the invention will become apparent from the following description of a drawing illustrated embodiment. Show it
  • FIG. 1 a schematic representation of a device according to the invention; and
  • FIG. 2 a schematic representation of a receiving device of the device according to the invention FIG. 1 ,

Figur 1 zeigt eine schematische Darstellung einer Vorrichtung 10 zur Verwendung in einem Verfahren zur galvanischen Herstellung einer Hartstoffpartikel aufweisenden Schutzschicht auf einem Bauteil 38 einer Strömungsmaschine. In dem dargestellten Ausführungsbeispiel handelt es sich dabei um eine Schaufelspitzenpanzerung einer Schaufelspitze 34 einer Rotorschaufel 42. Man erkennt, dass die Vorrichtung 10 eine tütenartige Aufnahmevorrichtung 12 zur Aufnahme der Hartstoffpartikel 14 (vgl. Figur 2) aufweist, wobei die Aufnahmevorrichtung 12 aus einem netz-, sieb- oder vliesartigen, für eine elektrochemische Beschichtungslösung durchlässigem Material mit einer Maschenweite die kleiner ist als der Durchmesser der Hartstoffpartikel 14 besteht. Zudem ist die Aufnahmevorrichtung 10 derart gestaltet, dass sie mit einer Öffnung 16 (vgl. Figur 2) über und um den zu beschichtenden Bereich 40 des Bauteils 38 lösbar anbringbar ist. In dem dargestellten Ausführungsbeispiel ist die Aufnahmevorrichtung 12 im Bereich ihrer Öffnung 16 mit einer Aufsatzgrundplatte 18 verbunden, wobei die Öffnung 16 mit einer Öffnung 20 in der Aufsatzgrundplatte 18 korrespondiert. Die Aufsatzgrundplatte 18 ist dabei an einer Abdeckung 24 lösbar befestigt. Die Befestigung erfolgt in dem dargestellten Ausführungsbeispiel durch Fixierungsstifte 28, die an der der Aufnahmevorrichtung 12 gegenüberliegenden Seite der Aufsatzgrundplatte 18 angeordnet sind und in entsprechende Fixieröffnungen 30 der Abdeckung 24 einführbar sind (vgl. Fig. 2). FIG. 1 shows a schematic representation of an apparatus 10 for use in a process for the galvanic production of a hard material particles having protective layer on a component 38 of a turbomachine. In the illustrated embodiment, this is a blade tip armor of a blade tip 34 of a rotor blade 42. It can be seen that the device 10 is a bag-like receiving device 12 for receiving the hard material particles 14 (see. FIG. 2 ), wherein the receiving device 12 from a net, screen or nonwoven, permeable to an electrochemical coating solution material with a mesh size which is smaller than the diameter of the hard particles 14 is. In addition, the receiving device 10 is designed such that it with an opening 16 (see. FIG. 2 ) is removably attachable over and around the region 40 to be coated of the component 38. In the illustrated embodiment, the receiving device 12 is connected in the region of its opening 16 with a top base plate 18, wherein the opening 16 with an opening 20 in the top base plate 18 corresponds. The attachment base plate 18 is releasably attached to a cover 24. The attachment takes place in the illustrated embodiment by fixing pins 28 which are arranged on the receiving device 12 opposite side of the attachment base plate 18 and in corresponding fixing openings 30 of the cover 24 are inserted (see. Fig. 2 ).

Des Weiteren erkennt man, dass die Abdeckung 24 mehrere Formöffnungen 26 zur Aufnahme der Schaufelspitzen 34 bzw. der zu beschichtenden Bereiche 40 des Bauteils 38 aufweist. Für den Beschichtungsvorgang wird die Öffnung 20 der Aufsatzgrundplatte 18 mit der Öffnung 16 der Aufnahmevorrichtung 12 über den Schaufelspitzen 34 bzw. den zu beschichtenden Bereichen 40 positioniert. Man erkennt, dass die einzelnen Formöffnungen 26 von jeweils einer Dichtung 36 formschlüssig umgeben sind. Die Dichtung 36 kommt dabei zwischen der Aufsatzgrundplatte 18 und der Abdeckung 24 zu liegen. Die Dichtung 36 besteht überlicherweise aus Wachs oder Gummi.Furthermore, it can be seen that the cover 24 has a plurality of mold openings 26 for receiving the blade tips 34 or the areas 40 of the component 38 to be coated. For the coating process, the opening 20 of the attachment base plate 18 with the opening 16 of the receiving device 12 is positioned over the blade tips 34 or the areas 40 to be coated. It can be seen that the individual mold openings 26 are surrounded by a respective seal 36 in a form-fitting manner. The seal 36 comes to lie between the top base plate 18 and the cover 24. The seal 36 is usually made of wax or rubber.

Des Weiteren erkennt man, dass an der Abdeckung 24 Fixiervorrichtungen 32 zu lösbaren Befestigung der Abdeckung 24 an dem Bauteil 38 ausgebildet sind. Die im dargestellten Ausführungsbeispiel zu beschichtende Schaufelspitze 34 der Rotorschaufel 42 besteht aus einer Titanlegierung.Furthermore, it can be seen that on the cover 24 fixing devices 32 are formed for releasably securing the cover 24 to the component 38. The blade tip 34 of the rotor blade 42 to be coated in the illustrated embodiment consists of a titanium alloy.

Figur 2 zeigt eine schematische Darstellung der Aufnahmevorrichtung 12. Man erkennt, dass in der tüten- und vliesartig ausgebildeten Aufnahmevorrichtung 12 die Hartstoffpartikel 14 konzentriert sind. Üblicherweise bestehen die Hartstoffpartikel 14 aus kubischem Bohrnitrid. Des Weiteren erkennt man, dass die Öffnung 16 der Aufnahmevorrichtung 12 mit der Aufsatzgrundplatte 18 verbunden ist, derart, dass die Öffnung 16 mit der Öffnung 20 in der Aufsatzgrundplatte 18 korrespondiert. Zudem wird deutlich, dass die Öffnung 20 in der Aufsatzgrundplatte von einer Dichtung 22 umgeben ist. Zudem sind an der Aufsatzgrundplatte 18 die beiden Fixierungsstifte 28 angeordnet. FIG. 2 shows a schematic representation of the receiving device 12. It can be seen that in the bag and fleece-like receiving device 12, the hard material particles 14 are concentrated. The hard material particles 14 usually consist of cubic boron nitride. Furthermore, it can be seen that the opening 16 of the receiving device 12 is connected to the attachment base plate 18, such that the opening 16 corresponds to the opening 20 in the attachment base plate 18. In addition, it is clear that the opening 20 in the attachment base plate is surrounded by a seal 22. In addition, the two fixing pins 28 are arranged on the attachment base plate 18.

Claims (13)

  1. A device for use in a method for the galvanic production of a protective layer, having hard-material particles, on a component (38) of a turbo-machine, in particular a blade-tip armouring of a blade tip (34) of a rotor blade (42), wherein the device (10) has a pouch-, bag- or sack-like receiving device (12) to receive the hard-material particles (14) and consists of a net-, screen- or non-woven-like material that is pervious to an electrochemical coating solution with a mesh width that is smaller than the diameter of the hard-material particles (14), and wherein the receiving device (12) is configured in such a way that it can be fitted in a detachable manner with an opening (16) over and around a region (40) of the component (38) that is to be coated, characterised in that the receiving device (12) in the region of its opening (16) of the receiving device (12) is connected to an attachment base plate (18) in such a way that the opening (16) corresponds with an opening (20) in the attachment base plate (18), and the attachment base plate (18) can be secured in a detachable manner to a cover (24), wherein the cover (24) has at least one shaped opening (26) to receive the regions (40) of the component (38) that are to be coated, and the opening (20) of the attachment base plate (18) is positioned with the opening (16) of the receiving device (12) over these regions (40).
  2. A device according to claim 1, characterised in that the opening (16) is surrounded by a flexible seal.
  3. A device according to claim 2, characterised in that the seal is laminated into the edge of the opening (16).
  4. A device according to one of claims 1 to 3, characterised in that the opening (20) is surrounded by at least one seal (22).
  5. A device according to one of claims 1 to 4, characterised in that formed on the side of the attachment base plate (18) lying opposite the receiving device (12) there is at least one fixing pin (28) for introduction into a corresponding fixing opening (30) of the cover (24).
  6. A device according to one of claims 1 to 5, characterised in that the cover (24) has at least one fixing device (32) for the detachable securement of the cover (24) to the component (38).
  7. A device according to one of claims 1 to 6, characterised in that the shaped opening (26) is surrounded by a seal (36) in a form-locking manner.
  8. A device according to one of the preceding claims, characterised in that the hard-material particles (14) consist of cubic boron nitride, ceramic material, titanium carbide, tungsten carbide, chromium carbide, aluminium oxide or zirconium oxide or a mixture thereof.
  9. Method for the galvanic production of a protective layer, having hard-material particles, on a component (38) of a turbo-machine, in particular a blade-tip armouring of a blade tip (34) of a rotor blade (42), having the following steps:
    a) fitting of an opening (16) of a pouch-, bag- or sack-like receiving device (12), filled with hard-material particles (14), of a device (10) over and around a region (40) of the component (38) to be coated, wherein the receiving device (12) consists of a net-, screen- or non-woven-like material that is pervious to an electrochemical coating solution with a mesh width that is smaller than the diameter of the hard-material particles (14);
    b) introduction of at least the regions (38) of the component (38) that are to be coated into a dip bath with the electrochemical coating solution and application of a voltage to form a metallic matrix layer at least on the region (40) of the component (38) that is to be coated with embedding of the hard-material particles (14); and
    c) galvanic formation of a filler layer between the embedded hard-material particles (14), characterised in that the receiving device (12) is connected in the region of its opening (16) to an attachment base plate (18) in such a way that the opening (16) of the receiving device (12) corresponds with an opening (20) in the attachment base plate (18), and the attachment base plate (18) can be secured in a detachable manner to a cover (24), wherein the cover (24) has at least one shaped opening (26) to receive the regions (40) of the component (38) that are to be coated, and the opening (20) of the attachment base plate (18) is positioned with the opening (16) of the receiving device (12) over these regions (40).
  10. Method according to claim 9, characterised in that the cover (24) is detachably secured to the component (38) prior to method step a).
  11. Method according to one of claims 9 to 10, characterised in that the electrochemical coating solution used in method step b) and/or method step c) contains nickel.
  12. Method according to one of claims 9 to 11, characterised in that the hard-material particles (14) consist of (cubic) boron nitride, ceramic material, titanium carbide, tungsten carbide, chromium carbide, aluminium oxide or zirconium oxide or a mixture thereof.
  13. Method according to one of claims 9 to 12, characterised in that prior to method step a) cleaning and/or covering of the components (38) with subsequent removal of the cover in the regions (40) that are to be coated and/or chemical pretreatment at least of the regions (40) of the component (38) that are to be coated are/is effected.
EP09757118A 2008-06-05 2009-06-03 Device for use in a method for the production of a protective layer and method for the production of a protective layer Not-in-force EP2281075B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL09757118T PL2281075T3 (en) 2008-06-05 2009-06-03 Device for use in a method for the production of a protective layer and method for the production of a protective layer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008026936A DE102008026936A1 (en) 2008-06-05 2008-06-05 Apparatus for use in a process for producing a protective layer and process for producing a protective layer
PCT/DE2009/000771 WO2009146684A2 (en) 2008-06-05 2009-06-03 Device for use in a method for the production of a protective layer and method for the production of a protective layer

Publications (2)

Publication Number Publication Date
EP2281075A2 EP2281075A2 (en) 2011-02-09
EP2281075B1 true EP2281075B1 (en) 2012-10-10

Family

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Application Number Title Priority Date Filing Date
EP09757118A Not-in-force EP2281075B1 (en) 2008-06-05 2009-06-03 Device for use in a method for the production of a protective layer and method for the production of a protective layer

Country Status (6)

Country Link
US (1) US20110186439A1 (en)
EP (1) EP2281075B1 (en)
CA (1) CA2726858A1 (en)
DE (1) DE102008026936A1 (en)
PL (1) PL2281075T3 (en)
WO (1) WO2009146684A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11078588B2 (en) * 2017-01-09 2021-08-03 Raytheon Technologies Corporation Pulse plated abrasive grit

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3046204A (en) * 1957-08-02 1962-07-24 Lee H Barron Method for making diamond tools
US3980549A (en) * 1973-08-14 1976-09-14 Di-Coat Corporation Method of coating form wheels with hard particles
US4608128A (en) * 1984-07-23 1986-08-26 General Electric Company Method for applying abrasive particles to a surface
JPS62161998A (en) * 1986-01-10 1987-07-17 Mitsubishi Metal Corp Particle dispersion metal plating device
US5074970A (en) 1989-07-03 1991-12-24 Kostas Routsis Method for applying an abrasive layer to titanium alloy compressor airfoils
CA2048804A1 (en) * 1990-11-01 1992-05-02 Roger J. Perkins Long life abrasive turbine blade tips
US5196107A (en) * 1990-12-25 1993-03-23 Mitsubishi Denki Kabushiki Kaisha Dispersion plating method
US5312540A (en) * 1992-01-31 1994-05-17 Honda Giken Kogyo Kabushiki Kaisha Method of and apparatus for producing a grinder used for a grinding machine and grinding-particles packing apparatus
US5389228A (en) * 1993-02-04 1995-02-14 United Technologies Corporation Brush plating compressor blade tips
US5486281A (en) 1993-10-15 1996-01-23 United Technologies Corporation Method for CBN tipping of HPC integrally bladed rotors
US5437724A (en) 1993-10-15 1995-08-01 United Technologies Corporation Mask and grit container
US5935407A (en) * 1997-11-06 1999-08-10 Chromalloy Gas Turbine Corporation Method for producing abrasive tips for gas turbine blades

Also Published As

Publication number Publication date
PL2281075T3 (en) 2013-03-29
CA2726858A1 (en) 2009-12-10
DE102008026936A1 (en) 2009-12-10
US20110186439A1 (en) 2011-08-04
EP2281075A2 (en) 2011-02-09
WO2009146684A3 (en) 2010-02-11
WO2009146684A2 (en) 2009-12-10

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