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WO2014117840A1 - Procédé et système de production d'un composant d'alliage allongé présentant une variation de composition longitudinale contrôlée, et composant d'alliage allongé correspondant - Google Patents

Procédé et système de production d'un composant d'alliage allongé présentant une variation de composition longitudinale contrôlée, et composant d'alliage allongé correspondant Download PDF

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Publication number
WO2014117840A1
WO2014117840A1 PCT/EP2013/051887 EP2013051887W WO2014117840A1 WO 2014117840 A1 WO2014117840 A1 WO 2014117840A1 EP 2013051887 W EP2013051887 W EP 2013051887W WO 2014117840 A1 WO2014117840 A1 WO 2014117840A1
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Prior art keywords
molten region
core
elongated
length
composition
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Ceased
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PCT/EP2013/051887
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English (en)
Inventor
Wayne Eric Voice
David John JARVIS
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Agence Spatiale Europeenne
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Agence Spatiale Europeenne
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Priority to PCT/EP2013/051887 priority Critical patent/WO2014117840A1/fr
Publication of WO2014117840A1 publication Critical patent/WO2014117840A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/34—Laser welding for purposes other than joining
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/003—Apparatus
    • C23C2/0036—Crucibles
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/38—Wires; Tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/32—Wires

Definitions

  • the present invention relates to methods and systems for producing elongated components, such as wires or tapes, and to combinatorial material discovery and development.
  • Ni-Cr alloy trenches formed by tracking a high power electron beam across a variable thickness Cr or Ni film on a Ni or Cr substrate, did not exhibit the hoped for longitudinal composition variations. Pharr et al., Final Report, section 4.4 ORNL/TM-2005/133 (June 2006). Characterization of hard to access material located in trenches is also inherently slow.
  • Co-AI alloy rods formed by zone-melting assemblies of specially-shaped Co and Al pieces, exhibited the hoped for continuous longitudinal composition variation. See M.Th. Cohen-Adad et al., vol. 22, no. 4, J. Phas. Equilib. & Diff. pp 379-85 (2001); vol. 289, nos. 1-2, J. Alloys & Compounds 185-196 (1999).
  • an elongated heat-resistant core such as a filament or strip
  • an alloy of a given composition by passing the article through a region of molten alloy.
  • the article is passed through a convex meniscus established above a region of the molten material held in a crucible inside an induction furnace.
  • a filament is drawn vertically through a region of levitated molten metal, or horizontally through a convex meniscus established above the end of a vertical bar, again in an induction furnace.
  • a method for producing an elongated alloy component with a controlled variable composition along its length comprising : applying a heat source to a first material to form a molten region containing a mixing flow; passing a length of heat-resistant elongated core through the molten region in a substantially longitudinal direction to coat the length with a coating comprising material from the molten region; controlling the longitudinal composition of the coating by, during the step of passing the length of core through the molten region, introducing a second material into the molten region; and, cooling the length of coated core to form an elongated component comprising an alloy having a controlled longitudinally varying composition.
  • Passing is used to include movement by drawing, i.e., pulling, or pushing, or both, and may include intermittent and/or continuous movement of the core at a fixed or variable rate.
  • Substantially longitudinal movement of the core length through the molten region means movement with a substantial longitudinal component between entry into and exit from the molten region.
  • the portion of core length in the molten region need not be straight, nor remain fixed on a given path between a given entry into and exit from the molten region.
  • a heat-resistant core is one that maintains sufficient structural integrity during and after passage through the molten region and that does not decompose and render the coating composition uncontrollable.
  • the elongated core once coated with material from the molten region and cooled, may generally be retained in the elongated alloy component.
  • the composition of the coating may be controlled by introducing second material into the molten region at a constant or variable rate, during passage of the length of core.
  • the second material may be introduced within discrete time intervals or continuously, including while the length of core is not actually moving .
  • the second material may be in a solid or molten state and may be in the form of elements, alloys, compounds, including ceramics, or mixtures of each form.
  • a mixing flow includes any flow within the molten region that creates sufficient homogeneity in the material leaving the molten region and forming the coating to allow longitudinal coating composition to be controlled.
  • a mixing flow may leave a systematic gradient of composition or temperature between the locations where material is introduced into and leaves from the molten region, and nevertheless allow the longitudinal coating composition to be controlled.
  • a mixing flow may be created by induction heating, as a result of induction currents within the molten region, or may result from application of a directed heat source to different areas of the molten region to promote mixing.
  • composition of the molten region may be rapidly varied, and thus the longitudinal variation of the composition of the alloy coating more precisely controlled.
  • Another advantage of the method is that any sufficiently stable molten material can be formed into an elongated alloy component with controllable longitudinally varying composition, if a compatible and suitable heat-resistant filament is available.
  • the elongated core may be a flexible filament or strip which, after coating, forms an elongated alloy component in the form of a wire or tape.
  • An advantage of using wires or tapes for combinatorial alloy discovery is that a single wire or tape that maps out a region or regions of phase space can be synthesized rapidly.
  • characterization can be done rapidly and may be automated.
  • at least one of the rate at which the second material is introduced, and the speed at which the core passes through the molten region may be regulated to control the longitudinal composition of the coating to vary continuously or substantially step-wise along at least a fraction of the length.
  • Regulating introduction of material is intended to include preprogrammed and automated introduction, and may be done in conjunction with monitoring of the rate of introduction of material and other parts of the process, including the temperature and composition of the molten region, the speed of the core and the composition and thickness of the coating on the core.
  • Regulating of the speed of the core is also intended to include preprogrammed and automated movement, and may be done in conjunction with monitoring of the speed of the core and other parts of the process, including the introduction of material, the temperature and composition of the molten region and the composition and thickness of the coating on the core.
  • the core movement may be regulated to have a constant speed.
  • An advantage, in combinatorial alloy discovery, of being able to control the longitudinal composition of an elongated alloy component is that, by changing the longitudinal coating composition continuously, a linear region of phase space may be mapped out, and by changing the longitudinal coating composition step-wise, points in phase space may be mapped out.
  • An advantage of controlling the longitudinal composition of the alloy component is that the length portions of coating with a longitudinally uniform or suitably variable composition may be scaled to suit different characterization methods, particularly those with relatively low spatial resolution, and thus rapid
  • the length of core may be passed through the molten region at a substantially constant or at a variable speed, and the second material may be introduced at a variable rate.
  • An advantage of keeping the speed of movement of the core substantially constant is that the thickness of the coating, and thus the rate at which material is removed from the molten region, may be maintained substantially constant.
  • first material or a third material may be introduced into the molten region during the step of passing the core.
  • first, third or other materials may be introduced into the molten region at a constant or variable rate, within discrete time intervals or while the core is not moving, and may be in a solid or molten state and may be in the form of elements, alloys, compounds, including ceramics, or mixtures of these forms.
  • Advantages of introducing a first material during passage of the core include the ability to increase as well as decrease the concentration of first material in the molten region and coating and thus attain a greater capacity to control longitudinal coating composition variation.
  • An advantage of introducing a third material, or a fourth, etc., is that a greater range of material compositions can be accessed, including the complete phase space of tertiary or higher order alloys.
  • material may be introduced into the molten region in the form of a wire or rod feed or a powder stream.
  • An advantage of using a wire or rod feed is that virtually all of the fed material may be introduced into the molten region, making the introduction of material easier to regulate.
  • An advantage of using a powder stream, despite the often lower fraction of the fed material actually introduced, is that materials that are either not available or feasible to use in wire or rod form may be introduced into the molten region.
  • the heat source may comprise an induction heat source or a directed heat source, such as a laser, electron beam, focused incoherent light source or a plasma source.
  • induction heating An advantage of using induction heating is that induction mixing can be used to maintain a homogeneous molten region at a uniform temperature and form a meniscus. A further advantage is that induction heating can be performed in vacuum, isolated from environmental contamination and the atmosphere. A yet further advantage of induction heating is that high and low melting point materials may be effectively melted and mixed together.
  • the molten region may comprise a convex meniscus through which the elongated core passes in a substantially horizontal orientation, while in others the molten region may be electromagnetically levitated and the elongated core passed in a substantially vertical orientation.
  • An advantage of the horizontal configuration is that it can be scaled relatively easily, by decreasing or increasing the power of the heat source and size of the molten region, while an advantage of levitation is that possible contamination from a crucible or other supporting material may be reduced or eliminated.
  • Another aspect of the invention relates to a system for forming a continuous alloy component having a controllably variable longitudinal composition is provided, comprising : a heat source configured to form a molten region comprising a first material; means for regulating the passage of an elongated core through the molten region to coat the core with material from the molten region; means for regulating the addition of second material to the molten region during passage of the elongated core; and, means for cooling the coated core to form an elongated alloy component with controlled longitudinally variable composition.
  • An advantage of such a system is that synthesis may be automated.
  • the system may be integrated with one or more means for characterizing the elongated alloy component at different portions along its length.
  • These may include structural and/or compositional measurements, and measurements of mechanical, electrical, magnetic or other relevant properties.
  • an elongated alloy component such as a wire or tape, comprising an elongated heat-resistant core surrounded by an alloy coating, the coating having a defined longitudinally varying composition, may be provided.
  • FIGS. 3 to 7 illustrate different possible system configurations for synthesizing elongated alloy components with controlled longitudinally variable compositions, corresponding to different combinations of molten region configurations, means for introducing materials into the molten region and heat sources.
  • the claims are not to be construed as limited to just these system configurations.
  • the claims are not to be construed as limited to just the profiles shown in FIGS. 2 or the method shown in FIG. 1, which show or refer to no more than three materials being introduced into to the molten region.
  • Figure 1 shows schematically features of a coating method according to the present invention.
  • Figures 2A and 2B show examples of longitudinal composition profiles formed according to the present invention.
  • Figures 3A and 3B shows schematically side and top views of a coating system configuration using inductive heating according to the present invention.
  • FIGS 4 and 5 show schematically coating system configurations that use an inductive heat source according to the present invention.
  • Figures 6 and 7 show schematically coating system configurations that use a directed heat source according to the present invention.
  • FIG. 1 A method for forming an alloy component with a longitudinally varying composition according to the invention is shown schematically in FIG. 1.
  • a heat resistant core 5 is shown passing through a molten region 7 at a speed S in a substantially lengthwise direction, as indicated by the dashed arrow.
  • the speed S may be maintained constant or may vary, including stopping entirely, during the passage and coating of the core.
  • the uncoated portion of the heat resistant core before entry into the molten region is shown as 5u, while the portion of the core within the molten region is shown as 5 M and the coated portion as 5 C .
  • the boundary between 5 M and 5 C shown by the dotted line, indicated schematically the exit of the core from the molten region, and the exit of molten material from region 7 into coating 6.
  • Molten region 7 may initially be composed of solely first material, formed and maintained by delivering heat at a rate H to a first material, as shown by the dashed arrow, from a heat source, which is not shown.
  • the molten region is shown to contain a mixing flow, as indicated by the curved arrows. The actual distribution of the mixing flow may vary and need not correspond to the simple form shown in this and other figures.
  • Passage of core 5 through molten region 7 forms a coating 6 onto the core.
  • a length L of core is shown to have passed through molten region to form an alloy component of constant diameter D and length L.
  • the thickness of the coating 6, and thus diameter D may vary as a function of the composition and temperature of molten region 7 and speed S at which a given core is moved .
  • coating thickness may increase as speed S is increased within a given low speed range, and decrease with speed S within a given high speed range.
  • the size of molten region 7, the size of the core, and the diameter of alloy component D are not intended to be to scale in the figures.
  • the composition of molten region 7 may be varied by introducing regulated amounts of second or third materials, shown entering the molten region at rates R 2 and R3, respectively, and by introducing regulated amounts of the first material, shown as entering at rate Ri.
  • alloy component diameter D may depend on other factors, such as the composition and temperature of the molten region.
  • molten region Given amounts of material or materials may be added to the molten region to achieve a desired composition, and the molten region may be allowed to homogenize and stabilize before applying a coating of the desired composition to the core, or materials may be added at low enough rates, and into multiple portions of the molten region, to avoid forming
  • homogenization and temperature stability need not be complete throughout molten region 7, so long as the material leaving molten region 7 at rate R 6 and forming coating 6, is sufficiently homogenous to allow the longitudinal coating composition to be controlled .
  • the long itudinal composition of length L of the component may be controlled by regulating the rates, Ri, R 2 , R3, etc., at which first, second, third, etc. materials are introduced, the rate R 6 at which molten material is removed, and the speed S at which core 5 is passed though molten region 7.
  • R 6 may be maintained more or less proportional to S.
  • the rate H, at which heat is delivered, may also be regulated, as necessary, to maintain the molten region and mixing flow during passage of the core.
  • first material during passage of the core allows for greater control over the longitud inal alloy coating composition, because the concentration of the first material can be increased or decreased and the coating composition controlled by balancing the rates at which first and other materials are introd uced into the molten reg ion .
  • the distance from the molten reg ion at which coating 6 beg ins to solidify wil l vary, depend ing on factors such as its composition, thickness and temperature, and the speed at which the coated core moves away from the molten reg ion and heat source, and is not shown in FIG . 1 or any other fig ure.
  • the cool ing of the coating may be further controlled and accelerated using conventional means, such as a gas stream .
  • the alloy component may be further heat treated, including cooling at a controlled rate.
  • Heat-resistant elongated core 5 may be a flexible filament or strip, which when coated and cooled forms an elongated alloy component in the form of a wire or tape.
  • Suitable materials for use as the heat resistant core include metals, includ ing refractory metals, such as tungsten or molybdenum wire or strip, or ceramics, such as silicon carbide filaments. Different cores may be compatible with d ifferent compositions and composition ranges of the molten region .
  • the filament or strip may be twisted and more than one filament or strip may be braided together to form the elongated core. Flexible filaments and strips are available in different lengths and are easy to store, for example, on reels, and handle.
  • tens or hundreds of meters of W and Mo filaments can be obtained in a range of diameters, of the order of 10 or 100 Mm .
  • Elongated alloy components e.g ., in the form of wires and tapes, can be synthesized relatively rapidly, with the core being passed at speeds of at least a few cm per second . Synthesis of alloy wires and tapes is amenable to
  • Alloy wires and tapes may be stored and handled relatively easily.
  • different types of longitudinal composition profile may be formed by appropriate regulation of material addition rates Ri and R 2 , and material removal rate R 6 , primarily, though not exclusively, through regulation of core passage speed S.
  • the rate H, at which heat is delivered to the molten region may also be regulated .
  • Profiles I to III show the longitudinal concentration profile, in arbitrary units, of second material measured at different points in coating 6 along length L, initially comprising solely first material and reaching a quantity corresponding to concentration C 2 .
  • the origin of the horizontal axis in FIG. 2A corresponds to the right hand end of length L shown in FIG. 1, where the concentration of the second material in the coating 6 is zero, before the second material was been added, and point L indicates the composition of the coating adjacent to the boundary, where the core and coating most recently exited the molten region .
  • the concentration of second material in the alloy coating can be controlled to increase at different rates along length L, either continuously or discontinuously, to reach level C 2 after passage of length L.
  • the step-wise increase shown in profile I can be achieved in different ways.
  • the core may initially be translated a distance 0.25 L, before any second material is added to the first material in the molten region, forming a portion of length 0.25 L coated in pure first material .
  • the core may then be maintained at a constant speed, stopped or slowed, while a quantity 0.25 C 2 of second material is added at rate R 2 .
  • the greater R 2 the more rapid the increase in the concentration of second material .
  • the process may be repeated to create a substantially stepwise increase over length L to concentration C 2 , which may be adjusted as required, as may the number of steps, the length and concentration change associated with each step. Further the steps need not have the aspect ratio shown, the horizontal portions need not be separated by vertical or even linear portions. For example, if core 5 is passed at a constant speed throughout the formation of the step-wise profile, during and after addition of second material, the composition of the molten region 7, and the composition of the material entering the coating, may take time to approach a uniform value, leading to a non-linear profile before each horizontal portion .
  • the horizontal portions may not be perfectly horizontal and may accommodate an increase or decrease in concentration of a constituent material .
  • Profile II shows a notionally linear increase of concentration of second material along length L, which may be achieved by balancing the rate R 2 , at which the second material is introduced, and the rate R 6 , at which a mixture of second and first material is removed from molten region 7.
  • First material may also be added at Ri to achieve a notionally linear profile.
  • Profile III shows the result of setting R 2 and R 6 nominally equal and constant, such that the volume of molten region 7 stays constant and the concentration of the second element asymptotes towards C 2 .
  • Profile types or portions of particular profile types may be repeated, and even reversed, along a length of core to create a complicated profile along a length L of core.
  • the second material concentration may be increased step-wise from C 2 to C 2 ', between 0 and l_i, and by then regulating the addition of first material and the speed of the core, the concentration of second material may be decreased step-wise back to C 2 , between l_i and L 2 .
  • a series of ascending and descending portions of step-wise profiles may be formed along a length of core, beyond the pair of ascending and descending portions shown in FIG. 2B.
  • given concentrations of third material may be established in each of the ascending and descending portions or pairs of portions shown in FIG. 2B.
  • portions 0 to , Li to L 2 , L 2 to L 3/ L 3 to L 4 may each correspond to a different concentration of a third material, or portions 0 to L 2 and L 2 to L 4 , may each correspond to a different composition of third material .
  • the ascending and descending pairs may contain two portions with nominally equal compositions and whose properties may be compared for verification purposes.
  • phase diagram By creating different profiles, different regions of a phase diagram may be mapped along the length of an alloy component. Continuously varying profiles, such as types II or III, correspond to lines running through phase space, and step-wise profiles, such as type I, correspond to points. Where first, second and third materials are elements, all or part of a tertiary phase diagram may be mapped out along a length of core. Where the materials are alloys, or where a fourth material is introduced, higher order phase diagrams maybe investigated . Other longitudinal profiles may be formed, including combinations of various stepwise and continuous profiles, with the addition of two, three or more materials or elements, as necessary. Possible configurations of systems for implementing the methods described above are shown in FIGS. 3 to 7.
  • Each of the configurations may be housed in a suitable enclosure or chamber and may be operated under vacuum or in an inert atmosphere, as appropriate for the particular molten region, heat source and means for introducing material .
  • the means for introducing material into the molten region may correspond to the wire or rod feeds shown in FIGS. 3, 4, 5, and 7, the powder stream shown in FIG. 6, or other suitable means, such as a stream of molten material .
  • Material in the form of rods, wire or powder may be preheated before introduction into the molten region, as may the elongated core.
  • Different material introduction means and heat sources may be combined in the same system .
  • a given first, second, etc., material may be introduced into the molten region using more than one introduction means.
  • FIGS. 3 to 7 do not show means for storing, guiding and regulating movement of the elongated core and elongated alloy component, nor means for storing the first, second, etc. materials. These may be distributed inside and outside the chamber or enclosure, as appropriate.
  • the means for cooling the coated core to form an elongated alloy component is also not indicated for the systems shown in FIGS. 3 to 7.
  • the cooling means may be passive, involving moving the coated core to locations remote from the heat source and molten region and allowing sufficient time for cooing, or active, such as a gas stream directed at the coated core, or a combination of both .
  • FIGS 3A and 3B are side and top views of the components of a possible system in which molten region 7 with a mixing flow, shown schematically by the curved arrows as in FIG. 1, formed in crucible 9 by application of induction heater 11.
  • the upper surface of molten region 7 is shown as comprising a convex meniscus, created at least in part by the action of the mixing flow, extending above the crucible, with core 5 passing through the meniscus and emerging with coating 6.
  • the different segments of core 5, uncoated, within the molten region or part of the alloy component 6, are not labeled .
  • Second and third materials in the form of rods or wires W 2 and W 3 , are shown being added at rates R 2 and R 3 , with material being removed from molten region 7 at rate R 6 .
  • the second and third materials are shown entering molten region 7 in locations remote from the core, to facilitate homogenization by the mixing flow.
  • first material may also be introduced into the molten region, and the second and third materials may be simultaneously introduced into more than one location .
  • FIG. 4 is a variation of the system shown in FIG. 3A and 3B, in which crucible 15 is open at its base to accommodate a feed rod or bar of solid first material 17, which may be used to introduce first material at rate Ri into a molten region 7, e.g ., by regulating the relative motion of solid material 17.
  • Induction heater 11 again forms molten region 7 containing a mixing flow and comprising a convex meniscus.
  • Core 5 is again shown passing at speed S through molten region 7, to form coating 6.
  • Second material is shown being added as rod or wire W 2 fed at rate R 2 a third, fourth, etc. material may also be added, with material being removed from molten region 7 into coating 6 at rate R 6 .
  • FIG. 5 shows a variation in which molten region 7 containing a mixing flow is levitated by action of induction heater 11 and contained within crucible 17, while core 5 passes vertically through the molten region at speed S.
  • Second and third materials in the form of a rods or wires W 2 and W 3 are shown added at rates R 2 and R 3 , with material being removed from molten region 7 into coating 6 at rate R 6 .
  • a first material, or a fourth material, may also be introduced to the molten region, though these features are not shown .
  • FIG. 6 is a further variation on the system of FIGS. 3A, 3B and 4, with core 5 passing horizontally at speed S through molten region 7 formed by a directed heat source 12.
  • Directed heat source 12 could be, e.g ., an electron beam, a laser or focused incoherent light source or a plasma source.
  • the molten region 7, comprising a convex meniscus and containing a mixing flow, is shown constrained by crucible 9 and a region of solid first material 17, from which first material enters the molten region at rate Ri, while material is removed from molten region 7 into coating 6 at rate R 6 .
  • the directed heat source may be configured, for example scanned, in order to maintain a mixing flow and from a suitable meniscus.
  • a second material is shown entering molten region 7 at rate R 2 , introduced by a stream of powder P 2 .
  • a third, fourth, etc. material could also be introduced, and an open-based crucible of the type shown in FIG. 4 could be used .
  • crucible 9 may no longer be needed to constrain molten region 7, and may be reduced in size or omitted entirely.
  • FIG. 7 show a further variation in which molten region 7, comprising a convex meniscus and containing a mixing flow and supported by a heat resistant substrate 19, is formed, as in FIG. 6, by directed heat source 12.
  • First and second materials, in the form of rods or wires W t and W 2 are shown being added at rates Ri and R 2 , with material being removed from molten region 7 into coating 6 at rate R 6 .
  • Third, fourth or more materials could also be added, though these are not shown in the figure.
  • the processes of forming and maintaining the molten region using the heat source, regulating the introduction into and removal of material from the molten region, and regulating the speed of passage of the core through the molten region may be preprogrammed, monitored and automated, as
  • Synthesis of an elongated alloy components using such a system may be preprogrammed or automated, and the different processes may be monitored to facilitate regulation.
  • the resulting elongated alloy components, such as wires and tapes may be stored on reels, for ease of transport and handling prior to their characterization.
  • Suitable characterization methods include structural and/or compositional measurements by x-ray diffraction, scanning electron microscopy, electron back- scatter pattern analysis, energy dispersive x-ray spectroscopy, and measurements of mechanical, e.g., hardness, electrical, or magnetic properties.
  • alloy components may be tailored to suit particular characterization methods. For example, a step-wise profile may be created comprising portions with uniform composition over a length that is suited to one or more characterization methods.
  • Automated characterization may involve passing the wire or strip at a more or less constant rate through one or more probe stations where one or more characterization methods may be conducted, or may involve stopping and starting the passage of the wire or strip through a probe station, as needed.
  • a system for synthesizing elongated alloy components may be integrated with means for practicing one or more of the previously mentioned characterization methods.
  • Alloy sample libraries particularly those in the form of a wires or tapes, may thus be synthesized and rapidly characterized in the same system, and the results obtained from the characterization means may be used to feed information back to the synthesis part of the system.
  • a promising composition range associated with a superior property in a portion of a coarse step-wise composition profile, may be further investigated by synthesizing a length of alloy component with a finer step- wise composition profile.
  • materials system suitable for investigation include alloys, except those with a substantially higher melting point than the available core materials, and may include superconductors, such as niobium-titanium based alloys, thermoelectrics, magnetic alloys, shape memory alloys and other multi- component materials.
  • superconductors such as niobium-titanium based alloys, thermoelectrics, magnetic alloys, shape memory alloys and other multi- component materials. The method and system may thus be applied to a range of alloy systems, including structural and functional alloys.

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  • Continuous Casting (AREA)

Abstract

La présente invention concerne des composants d'alliage (5) allongés, tels que des fils ou des rubans, qui comprennent un noyau thermorésistant et un revêtement d'alliage présentant une composition contrôlée à variation longitudinale, appropriée pour la découverte et la mise au point d'un alliage combinatoire, ou pour d'autres utilisations. On décrit un procédé de synthèse de tels composants (5), qui consiste à faire passer un noyau thermorésistant (5) à travers une zone en fusion (7) comprenant un premier matériau, tandis qu'un ou plusieurs autres matériaux sont introduits dans la zone en fusion (7). On décrit également un système approprié pour la synthèse et la caractérisation de tels composants (5).
PCT/EP2013/051887 2013-01-31 2013-01-31 Procédé et système de production d'un composant d'alliage allongé présentant une variation de composition longitudinale contrôlée, et composant d'alliage allongé correspondant Ceased WO2014117840A1 (fr)

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PCT/EP2013/051887 WO2014117840A1 (fr) 2013-01-31 2013-01-31 Procédé et système de production d'un composant d'alliage allongé présentant une variation de composition longitudinale contrôlée, et composant d'alliage allongé correspondant

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PCT/EP2013/051887 WO2014117840A1 (fr) 2013-01-31 2013-01-31 Procédé et système de production d'un composant d'alliage allongé présentant une variation de composition longitudinale contrôlée, et composant d'alliage allongé correspondant

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US4233338A (en) * 1977-08-31 1980-11-11 Produits Chimiques Ugine Kuhlmann Processes for deposition of thin films of crystalline silicon on graphite
US5662969A (en) 1994-01-31 1997-09-02 Graham Group Hot coating by induction levitation
US6030371A (en) * 1996-08-23 2000-02-29 Pursley; Matt D. Catheters and method for nonextrusion manufacturing of catheters
US6174570B1 (en) 1998-01-22 2001-01-16 Societe Nationale d'Etude et de Construction de Moteurs d'Aviation “SNECMA” Method for metal coating of fibres by liquid process
KR20030052753A (ko) * 2001-12-21 2003-06-27 주식회사 포스코 고강도 용융아연도금강판의 제조방법
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US4233338A (en) * 1977-08-31 1980-11-11 Produits Chimiques Ugine Kuhlmann Processes for deposition of thin films of crystalline silicon on graphite
US5662969A (en) 1994-01-31 1997-09-02 Graham Group Hot coating by induction levitation
US6030371A (en) * 1996-08-23 2000-02-29 Pursley; Matt D. Catheters and method for nonextrusion manufacturing of catheters
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