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EP2622111B1 - Procédé et dispositif de projection thermique - Google Patents

Procédé et dispositif de projection thermique Download PDF

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Publication number
EP2622111B1
EP2622111B1 EP11827768.0A EP11827768A EP2622111B1 EP 2622111 B1 EP2622111 B1 EP 2622111B1 EP 11827768 A EP11827768 A EP 11827768A EP 2622111 B1 EP2622111 B1 EP 2622111B1
Authority
EP
European Patent Office
Prior art keywords
gas
nozzle
compressed gas
filler material
flow
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
Application number
EP11827768.0A
Other languages
German (de)
English (en)
Other versions
EP2622111A2 (fr
Inventor
Gerd Paczkowski
Christian Rupprecht
Bernhard Wielage
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.)
Technische Universitaet Chemnitz
Original Assignee
Technische Universitaet Chemnitz
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Technische Universitaet Chemnitz filed Critical Technische Universitaet Chemnitz
Publication of EP2622111A2 publication Critical patent/EP2622111A2/fr
Application granted granted Critical
Publication of EP2622111B1 publication Critical patent/EP2622111B1/fr
Not-in-force legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/16—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed
    • B05B7/22—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed electrically, magnetically or electromagnetically, e.g. by arc
    • B05B7/222—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed electrically, magnetically or electromagnetically, e.g. by arc using an arc
    • B05B7/224—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed electrically, magnetically or electromagnetically, e.g. by arc using an arc the material having originally the shape of a wire, rod or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B15/00—Details of spraying plant or spraying apparatus not otherwise provided for; Accessories
    • B05B15/50—Arrangements for cleaning; Arrangements for preventing deposits, drying-out or blockage; Arrangements for detecting improper discharge caused by the presence of foreign matter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/16—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed
    • B05B7/20—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed by flame or combustion
    • B05B7/201—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed by flame or combustion downstream of the nozzle
    • B05B7/203—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed by flame or combustion downstream of the nozzle the material to be sprayed having originally the shape of a wire, rod or the like
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
    • C23C4/131—Wire arc spraying

Definitions

  • the invention relates to a method and apparatus for thermal spraying, in particular for arc spraying with filler material, as it is, for example, the wire arc spraying, according to the preamble of the first and eighth claim, wherein a filler material, usually two electrically conductive wires, melted by an arc and means a compressed gas (also called atomizing gas) are sprayed at high speeds in the range of 1 Mach and larger on a prepared surface.
  • a burner with a corresponding nozzle with a preferably centric flow opening for the compressed gas is used.
  • the wires are fed through current-carrying sleeves with different polarity, with a wire feed device being used for this purpose.
  • nebulizer gas nozzles direct the nebulizer gas to the molten material phase.
  • the material phase is nebulized and accelerated by momentum transfer of the gaseous phase in the resulting free jet
  • molten spray material dwells on the vortex-shaped trajectories in the area of the wire ends.At this time, the material is oxidized due to the atmospheric oxygen of the ambient or compressed air.On the continuous melting of the wire increases the recirculating amount of the molten phase, with the result of inhomogeneous atomization critically grown melting droplets.
  • a method of operating a plasma spray gun is disclosed in the document CH 578 622 known.
  • the working gas before its entry into the nozzle has a pressure of greater than or equal to 7 atmospheres and the fuel flow of the arc to a value of greater than or equal to 1000 amps.
  • the gas flow of the working gas and the fuel flow are pulsed synchronously, whereby the gas flow through the nozzle and the fuel flow between the pulses are brought to values close to or equal to zero.
  • the plasma spraying burner has a pin-shaped cathode. This is followed in the direction of work by an anodically connected Laval nozzle, which widens in the working direction.
  • a DC voltage generates an arc between the anode and the cathode and the working gas flowing through the plasma torch, which contains particulate spray material, is passed through the arc and ionized thereby, producing a plasma jet flowing through the nozzle above the nozzle inlet and thus within the plasma spray torch and exits from this at a speed of a few 1000 m / s, bouncing on the substrate to be coated and this coated with the molten particles.
  • the cathode is moved axially over cams up and down, so that the nozzle inlet is opened and closed in a pulsed manner. In this case, the nozzle inlet of the anodically connected nozzle is not complete be closed, as this would lead to a short circuit.
  • This solution is intended to be used to produce adherent layers, assuming that plasma jet speeds of a few 1000 m / s (subsonic flow of the plasma) can be generated when large values of the arc fuel stream and high gas pressures are provided. Since this leads to a very high thermal load on the nozzle, a pulsed mode of operation is proposed in this prior art.
  • the invention has for its object to develop a device for high-speed thermal spraying with filler, which avoids unwanted settling of the molten material at the nozzle or the additional material and ensures high-quality layer at high particle speeds in a homogeneous layer structure.
  • the modulated / pulsating gas flow is generated with a time variation of the gas volume flow of the compressed gas using a nebulizer gas nozzle.
  • the high-pressure gas flow expands preferably in the nozzle to speeds greater than Mach 1. These high speeds of the atomizing gas ensure Bescheunist the molten material phase and their adhesion to the base material.
  • the modulation of the gas flow of the compressed gas takes place as a function of the control behavior of the current-voltage source. However, it is also possible to control the frequency / modulation of the compressed gas regardless of the frequency of the current-voltage source or regulate.
  • the pulsed gas flow which leads to avoid the recirculation of the atomizing gas behind the wire ends and behind the arc and / or the instantaneous detachment of the molten droplets or particles of the filler materials, is preferably in dependence on the electrical parameters (current, voltage or current Voltage characteristic) of the current-voltage source and / or adjusted as a function of the fluid mechanical conditions of the respective coating task and can be determined by a few experiments.
  • the change in the frequency of the pulse of the gas flow of the atomizing gas is preferably carried out with a frequency from 20 Hz, wherein it is also possible, if necessary, to change the frequency or the pulse duration of the gas flow during the coating process.
  • the device according to the invention has a device for generating a compressed gas, which flows out at high speed through a nozzle and injects the molten material of the filler material onto a surface, wherein means are provided by which a modulated / pulsating gas flow of high velocity of the compressed gas can be generated through which the formation of a quasi-stationary vortex field of the behind the spray filler material and behind the short arc prevented or at least restricted.
  • a modulated / pulsating gas flow of high velocity of the compressed gas can be generated through which the formation of a quasi-stationary vortex field of the behind the spray filler material and behind the short arc prevented or at least restricted.
  • Most (eg thermal spraying) of the filler material in the form of two electrically conductive wires is formed, the ends of which are arranged in the region of the outlet of the nozzle or between the nozzle outlet and the surface to be coated, wherein in the region of the ends of the filler, through the means arranged in the device, a modulated / pulsating gas flow of the compressed gas with a time variation of the atomizing gas volumetric flow, the restriction or prevention of the quasi-stationary vortex field.
  • the means may be formed for example in the form of the gas flow of the pressure gas changing valves or in the form of mechanical elements and according to the required pulses interrupt the gas flow and greatly reduce and release again.
  • the mechanical elements are preferably arranged in a pressure line leading to the nozzle for the compressed gas and may be formed, for example, in the form of an angle to the pressure line through this rotatable shaft having one or more transverse bores in the region of the pressure line and by rotation the flow of the pressurized gas locks or greatly reduces or releases.
  • the means are designed in particular in the form of valves which change the gas flow, which may be, for example, high-performance valves which ensure a fast switching frequency.
  • the nozzle is designed in the manner of a nebulizer gas nozzle, in particular a Laval nozzle, which extends in Direction of flow of the gas first tapers and then expanded again, whereby the gas flow is first braked and then expanded, whereby its speed increases again.
  • the filler material is inclined with respect to the longitudinal axis of the nozzle in a shallow angle of attack, which is a maximum of 90 ° to 0 °, preferably about 25 ° ⁇ 5 °, with its ends in the region of the nozzle outlet or between the nozzle outlet and the to be coated surface.
  • a further advantageous embodiment of the invention is that the wire feed device, with which the filler material is tracked, not realized as usual a continuous tracking of the wire, but the wire feed discontinuously, or gradually regulates, such that the tracking of the wire in particular Dependence / correlation with the pulses of the pulsating gas flow of the compressed gas takes place.
  • the conceptual approach of the invention is based on a targeted, "high velocity" 'modulated' gas flow adapted to the process (or a temporal change in sputtering gas volumetric flow) to prevent settling of the molten phase (s) behind the wire ends and beyond the arc (preferably outside the nozzle).
  • This "pulsation" is preferably realized by high-performance solenoid valves, which relate their control signal as a function of the time interval of melting or melting a corresponding material fraction of the wire-shaped spray additive.
  • the high pressure gas flow is directed through suitable nebulizer gas nozzles (Laval similar) directed to speeds greater than Mach 1.
  • the impulsive impact of the gas phase leads to a fine and homogeneous atomization of the material phases.
  • the resulting quasi-stationary vortex field (behind the wire ends) is greatly reduced due to the pulsed gas flow and minimizes beam divergence.
  • the recirculation areas in the region of the wire ends are also greatly reduced, so that the melt film or drops do not or only partially recirculate and oxidize in these fluidized areas.
  • the control signal of the solenoid valves is synchronized for better process control with the control circuit of the current-voltage source.
  • the nebulizer gas nozzles are designed mass flow-specific for this process.
  • the gas flow pulsed by valves is adapted to the respective coating task, depending on the electrical parameters (current, voltage - including their frequencies and current-voltage characteristic) and the flow-mechanical conditions that lead to droplet detachment.
  • electrical parameters current, voltage - including their frequencies and current-voltage characteristic
  • flow-mechanical conditions that lead to droplet detachment.
  • FIG. 1 a device for coating the surface 1a of a base material 1 is shown, whereby a spray coating 2 was produced by means of wire arc spraying.
  • a filler material 3 here two wires, is guided in contact tubes 4. Both contact tubes 4 are connected to a voltage source 5, so that they are poled differently.
  • the filler material 3 can be tracked by a respective wire feed device 6. The ends of the filler material 3 are between the unspecified outlet of the nozzle 7 and the surface 1 a of the base material 1.
  • a mist 3a forms from the ablated filler material, with the risk that it forms a quasi-stationary vortex field, ie massive recirculation areas behind the wire-shaped spray additive material of the molten material before the nozzle in the region of the ends of the filler material, which can lead to that melted sprayed material dwells in the region of the wire ends on the vortex-shaped trajectories and oxidized in this time due to the atmospheric oxygen of the ambient or compressed air.
  • This is restricted or prevented according to the invention by the fact that the droplets of the plasma mist can not settle on the nozzle 7 or the contact tubes 4 or the additional material 3 due to the pulsed compressed gas.
  • an alternating current or a pulsed direct current is preferably generated, wherein the pressurized gas 8 is pulsed by a corresponding device 9, which has a high-performance valve not designated, in particular in dependence on the frequency of the voltage source (in particular synchronously thereto).
  • the frequency with which the compressed gas is pulsed regardless of the frequency of the voltage source. If DC power is provided by the voltage source, only the pressurized gas pulsates.
  • the required frequency of the pulsation of the compressed gas which is required for preventing the deposition of drops on the system or their removal, can be determined by a few experiments and is preferably ⁇ 20 Hz.
  • the speed of the gas flow of the compressed gas is greater than 1 after the nozzle at Mach numbers.
  • the Drahtanstellwinkel ⁇ of the filler material 3 is very flat and is preferably in the range of about 10 ° relative to the longitudinal axis A of the nozzle. 7
  • the flow cross-section of the nozzle 7 decreases in the flow direction in the manner of a diffuser and then widens again in the manner of a confuser, whereby the compressed gas 8 is accelerated. Its speed is after the nozzle Mach 1 and more, whereby an excellent homogeneity of the spray layer 2 and a good adhesion to the base material 1 is ensured.
  • FIG. 2 A schematic diagram of a variant for the mechanical pulsing of the compressed gas is shown in FIG. 2 shown.
  • the means for generating the pulsating gas flow are integrated into the pressure line 10 for the compressed gas and can interrupt and release the gas flow.
  • the pressure line 10 passes through a housing 11 in which at an angle of 90 ° and thus transversely to the pressure line 10 a this interrupting and is arranged by this rotatable shaft 12 is arranged.
  • the rotatable shaft 12 has in the region of the pressure line 10 has a transverse bore 13 in the form of a through hole.
  • the compressed gas flows through the transverse bore 13 in the direction of arrow to the nozzle, not shown here, when the transverse bore 13 is in a position in which the two openings 13.1, 13.2 have a connection to the pressure line 10. If the shaft 12 continues to rotate, the through-bore 13 is rotated in such a way that the pressure line 10 is interrupted.
  • the shaft 12 is rotatably supported by bearings 14 in the housing 11.
  • the flow of the pressurized gas is alternately locked or released and thereby generates the pulsating gas flow.
  • the frequency with which the gas flow pulsates can be determined in a simple manner by the rotational speed of the shaft, which is driven by a motor, not shown here. According to a variant, not shown, several through holes can pass through the shaft.
  • the solution according to the invention as a whole creates a simple and practical possibility for reducing or avoiding the developing vortex region of melted particles of the filler material and thereby undesirable settling or residence of particles / drops of the melted filler material on the burner / nozzle and / or on the filler material even avoided. As a result, a high-quality coating result can be realized.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Electromagnetism (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Nozzles (AREA)

Claims (15)

  1. Procédé de projection thermique, en particulier de projection par arc électrique d'un matériau d'appoint (3) qui est fondu par un arc électrique produit au moyen d'électrodes, dans lequel un gaz sous pression (8) sort à grande vitesse par une tuyère (7) et projette le matériau d'appoint (3) fondu sur une surface (la),
    dans lequel
    - un gaz sous pression (8) est généré avec un écoulement de gaz modulé/pulsé à grande vitesse et
    - la formation d'un lit tourbillonnaire quasi-stationnaire de matériau d'appoint (3) fondu est ainsi limitée ou empêchée, de telle façon
    - que le dépôt ou la persistance de particules/gouttes du matériau fondu sur la tuyère (7) et/ou sur le matériau d'appoint (3) soit empêché et/ou que les particules/gouttes déposées dessus soient dissoutes,
    caractérisé en ce que la modulation/la pulsation du flux de gaz sous pression (8) produit lors d'une modification dans le temps du débit volumique de gaz réalise la restriction ou l'inhibition du lit tourbillonnaire quasi-stationnaire au niveau des extrémités du matériau d'appoint (3).
  2. Procédé selon la revendication 1, caractérisé en ce qu'un flux de gaz modulé/pulsé est produit lors d'une modification dans le temps du débit volumique du gaz sous pression (8) en utilisant une tuyère (7) qui prend la forme d'une tuyère à gaz de pulvérisation.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le flux sous haute pression de gaz sous pression (8) est expansé à des vitesses supérieures à Mach 1.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que la modulation du flux de gaz sous pression (8) est commandée ou régulée en fonction de la modulation de la vitesse du gaz sous pression (8) indépendamment de la fréquence de la source de tension de courant (5) des électrodes.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que le flux de gaz pulsé est adapté en fonction des paramètres électriques des électrodes et/ou en fonction des conditions de mécanique des fluides de la tâche de revêtement en question.
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que la modification de la fréquence de l'impulsion du flux de gaz sous pression (8) s'effectue à partir d'une fréquence de 20 Hz et en ce que la fréquence du flux de gaz peut être modifiée en fonction des besoins.
  7. Dispositif pour la projection thermique, en particulier pour la projection par arc électrique de matériau d'appoint (3) fondu par un arc électrique généré au moyen d'électrodes, dans lequel le dispositif comprend une installation pour la production d'un gaz sous pression (8) qui sort à grande vitesse à travers une tuyère (7) et projette le matériau d'appoint (3) fondu sur une surface préparée (la), caractérisé en ce que
    - le dispositif pour la production du gaz sous pression présente des moyens qui peuvent produire un flux de gaz sous pression (8) modulé/pulsé,
    - qui restreint ou empêche la formation d'un lit tourbillonnaire quasi-statique de matériau fondu de telle façon que le dépôt de particules/gouttes de matériau fondu sur la tuyère (7) et/ou aux extrémités du matériau d'appoint (3) soit évité et/ou que les particules/gouttes déposées dessus soient dissoutes et
    - en ce qu'au niveau des extrémités du matériau d'appoint (3), les moyens disposés dans le dispositif réalisent la restriction ou l'inhibition d'un lit tourbillonnaire quasi-statique par le fait
    - que les moyens permettent de réaliser un écoulement modulé/pulsé du gaz sous pression (8) avec une modification dans le temps du débit volumique du gaz sous pression (8).
  8. Dispositif selon la revendication 7, caractérisé en ce que les moyens sont conformés comme des valves modifiant le flux de gaz sous pression (8) ou comme des éléments mécaniques qui arrêtent ou réduisent fortement et libèrent le flux de gaz en fonction des impulsions requises.
  9. Dispositif selon la revendication 8, caractérisé en ce que les éléments mécaniques sont disposés dans une conduite sous pression (10) pour le gaz sous pression (8) menant à la tuyère (7) et arrêtent ou réduisent fortement et libèrent le flux de gaz sous pression (8) passant par la conduite sous pression (10).
  10. Dispositif selon la revendication 9, caractérisé en ce qu'il est prévu, disposé selon un angle par rapport à la conduite sous pression (10), un arbre rotatif (12) passant à travers celle-ci, qui présente au niveau de la conduite sous pression (10) un ou plusieurs alésages transversaux (13) et qui coupe ou réduit fortement et libère le flux de gaz sous pression (8) par sa rotation.
  11. Dispositif selon l'une des revendications 7 à 10, caractérisé en ce que la tuyère (7) est conformée comme une tuyère à gaz de pulvérisation, en particulier une tuyère de Laval.
  12. Dispositif selon l'une des revendications 7 à 11, caractérisé en ce que la tuyère (7) se resserre d'abord puis s'élargit dans le sens du flux de gaz sous pression (8).
  13. Dispositif selon l'une des revendications 7 à 12, caractérisé en ce que la tuyère (7) présente un axe longitudinal (A) et le matériau d'appoint est incliné selon un angle (α) de 90° à 0° par rapport à l'axe longitudinal (A) de la tuyère.
  14. Dispositif selon l'une des revendications 7 à 13, caractérisé en ce que le matériau d'appoint (3) conformé comme un fil peut être amené par une installation d'avancement de fil (6), l'avancement du fil/matériau d'appoint (3) s'effectuant « pas à pas » en corrélation avec les impulsions du flux de gaz pulsé du gaz sous pression (8).
  15. Dispositif selon l'une des revendications 7 à 14, caractérisé en ce que le dispositif présente des moyens permettant de réaliser la modulation du flux de gaz sous pression (8) en fonction de la fréquence de la source de tension de courant (5) ou du comportement de fusion du matériau d'appoint (3).
EP11827768.0A 2010-09-29 2011-09-22 Procédé et dispositif de projection thermique Not-in-force EP2622111B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202010008661U DE202010008661U1 (de) 2010-09-29 2010-09-29 Vorrichtung zum thermischen Spritzen
PCT/DE2011/075229 WO2012048703A2 (fr) 2010-09-29 2011-09-22 Procédé et dispositif de projection thermique

Publications (2)

Publication Number Publication Date
EP2622111A2 EP2622111A2 (fr) 2013-08-07
EP2622111B1 true EP2622111B1 (fr) 2015-04-08

Family

ID=45595662

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11827768.0A Not-in-force EP2622111B1 (fr) 2010-09-29 2011-09-22 Procédé et dispositif de projection thermique

Country Status (3)

Country Link
EP (1) EP2622111B1 (fr)
DE (2) DE202010008661U1 (fr)
WO (1) WO2012048703A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103480519B (zh) * 2013-09-22 2017-01-25 张志宇 抗断电的电弧喷枪

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH578622A5 (fr) 1972-03-16 1976-08-13 Bbc Brown Boveri & Cie
DE4334610A1 (de) 1993-10-11 1995-04-13 Krupp Polysius Ag Verfahren zur Behandlung einer Oberfläche durch thermisches Spritzen
EP0879645A3 (fr) 1997-05-24 1999-05-26 Grillo-Werke AG Procédé de nettoyage du fil utilisé lors de la pulvérisation par arc électrique ainsi que dispositif adapté à la mise en oeuvre dudit procédé

Also Published As

Publication number Publication date
DE112011103335A5 (de) 2013-07-04
DE202010008661U1 (de) 2012-01-13
WO2012048703A4 (fr) 2012-10-18
WO2012048703A3 (fr) 2012-07-05
WO2012048703A2 (fr) 2012-04-19
EP2622111A2 (fr) 2013-08-07

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