WO2017175499A1 - TiAl系金属間化合物焼結体及びTiAl系金属間化合物焼結体の製造方法 - Google Patents
TiAl系金属間化合物焼結体及びTiAl系金属間化合物焼結体の製造方法 Download PDFInfo
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- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/16—Both compacting and sintering in successive or repeated steps
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/0408—Light metal alloys
- C22C1/0416—Aluminium-based alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/045—Alloys based on refractory metals
- C22C1/0458—Alloys based on titanium, zirconium or hafnium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/047—Making non-ferrous alloys by powder metallurgy comprising intermetallic compounds
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C14/00—Alloys based on titanium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2301/00—Metallic composition of the powder or its coating
- B22F2301/05—Light metals
- B22F2301/052—Aluminium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2301/00—Metallic composition of the powder or its coating
- B22F2301/20—Refractory metals
- B22F2301/205—Titanium, zirconium or hafnium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2301/00—Metallic composition of the powder or its coating
- B22F2301/40—Intermetallics other than rare earth-Co or -Ni or -Fe intermetallic alloys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2304/00—Physical aspects of the powder
- B22F2304/10—Micron size particles, i.e. above 1 micrometer up to 500 micrometer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
Definitions
- the present invention relates to a TiAl-based intermetallic compound sintered body and a method for producing a TiAl-based intermetallic compound sintered body.
- TiAl-based intermetallic compounds are intermetallic compounds (alloys) composed of Ti (titanium) and Al (aluminum) bonded together, and are lightweight and have high strength at high temperatures. Applied to high temperature structural materials. TiAl-based intermetallic compounds are difficult to form by forging, casting, or the like due to their low spreadability, and may be formed by sintering. A sintered body of a TiAl-based intermetallic compound is formed, for example, by sintering a powder of a TiAl-based intermetallic compound as shown in Patent Document 1.
- the sintered body of the TiAl-based intermetallic compound can have higher strength by increasing the sintered density when sintered. Therefore, higher sintering density is required.
- the present invention provides a TiAl-based intermetallic compound sintered body having a high sintered density and high strength, and a method for producing a TiAl-based intermetallic compound sintered body having a high sintered density and high strength. Objective.
- a manufacturing method of a TiAl-based intermetallic compound sintered body of the present disclosure includes a TiAl-based intermetallic compound in which Ti and Al are bonded and an additive metal.
- a sintered powder body is sintered to produce a TiAl intermetallic compound sintered body, and the additive metal is Ni or Ni and Fe.
- the TiAl-based intermetallic compound sintered body can be made into a metal structure in which an additive metal phase is present at the grain boundary of the adjacent TiAl phase. Therefore, this method for producing a TiAl-based intermetallic compound sintered body can increase the sintered density and the strength.
- the method of manufacturing the TiAl-based intermetallic compound sintered body includes a mixing step of mixing the TiAl-based powder body and a binder to obtain a mixture, and injection molding in which the mixture is formed into a molded body by a metal injection molding machine. It is preferable to include a step, a degreasing step for degreasing the molded body to produce a degreased body, and a sintering step for sintering the degreased body to produce the TiAl-based intermetallic compound sintered body. Since this TiAl-based intermetallic compound sintered body uses a metal powder injection molding method, it is possible to improve the shape accuracy while improving the sintering density.
- the TiAl-based powder body preferably has a Ni content of 0.01 wt% or more and 1 wt% or less.
- the additive metal phase can be appropriately present at the grain boundary of the adjacent TiAl phase, so that the sintered density can be appropriately improved.
- the TiAl-based powder body preferably has a total amount of Ni and Fe of 0.01% by weight or more and 2% by weight or less.
- the additive metal phase can be appropriately present at the grain boundary of the adjacent TiAl phase, so that the sintered density can be appropriately improved.
- the TiAl-based powder body is preferably a mixture of a plurality of TiAl-based solid solution powders containing the TiAl-based intermetallic compound and the additive metal.
- the additive metal phase can be appropriately present at the grain boundary of the adjacent TiAl phase, so that the sintered density can be appropriately improved.
- the TiAl-based powder body is a mixture of a TiAl-based powder that is a powder of the TiAl-based intermetallic compound and an additive metal powder containing the additive metal. It is preferable.
- the additive metal phase can be appropriately present at the grain boundary of the adjacent TiAl phase, so that the sintered density can be appropriately improved.
- the TiAl-based intermetallic compound sintered body of the present disclosure contains a TiAl-based intermetallic compound in which Ti and Al are bonded, and an additive metal that is Ni,
- the Ni content is 0.01% by weight or more and 1% by weight or less of the whole. Since this TiAl-based intermetallic compound sintered body contains Ni in this compounding ratio with respect to the TiAl-based intermetallic compound, it is possible for the Ni phase to exist at the grain boundary of the TiAl phase of the sintered body. become. Therefore, the sintered density of the TiAl-based intermetallic compound sintered body is improved.
- a TiAl-based intermetallic compound sintered body of the present disclosure includes a TiAl-based intermetallic compound in which Ti and Al are bonded, and an additive metal that is Ni and Fe.
- the total content of Ni and Fe is 0.01% by weight or more and 2% by weight or less based on the total content. Since this TiAl-based intermetallic compound sintered body contains Ni and Fe in this compounding ratio with respect to the TiAl-based intermetallic compound, the NiFe phase must exist at the grain boundary of the TiAl phase of the sintered body. Is possible. Therefore, the sintered density of the TiAl-based intermetallic compound sintered body is improved.
- the TiAl-based intermetallic compound sintered body contains 20 to 80 wt% Ti, 20 to 80 wt% Al, and 0 to 30 wt% mixed metal,
- the mixed metal preferably contains at least one of Nb, Cr, and Mn.
- the TiAl-based intermetallic compound sintered body has improved strength because the TiAl-based intermetallic compound has this blending ratio.
- the TiAl-based intermetallic compound sintered body a plurality of TiAl-based sintered powders containing the TiAl-based intermetallic compound and the additive metal are bonded, and the additive metal phase that is a metal phase of the additive metal is It is preferable that it exists between the adjacent TiAl-based sintered powders.
- the additive metal phase since the additive metal phase is present at the grain boundary of the TiAl phase of the sintered body, the sintering density is more appropriately improved.
- the sintered density of the TiAl-based intermetallic compound sintered body can be increased and the strength can be increased.
- FIG. 1 is a block diagram showing a configuration of a sintered body manufacturing system according to the first embodiment.
- FIG. 2 is an explanatory diagram schematically illustrating the configuration of the powder manufacturing apparatus according to the first embodiment.
- FIG. 3 is a schematic view for explaining phases of the TiAl-based intermetallic compound sintered body according to the first embodiment.
- FIG. 4 is a flowchart for explaining a manufacturing flow of the TiAl-based intermetallic compound sintered body by the sintered body manufacturing system according to the first embodiment.
- FIG. 5 is a table showing the sintered density of the example and the comparative example.
- FIG. 6 is a diagram of the metal structure of the TiAl-based intermetallic compound sintered body of the comparative example.
- FIG. 1 is a block diagram showing a configuration of a sintered body manufacturing system according to the first embodiment.
- FIG. 2 is an explanatory diagram schematically illustrating the configuration of the powder manufacturing apparatus according to the first embodiment.
- FIG. 3 is a schematic view for
- FIG. 7 is a diagram of the metal structure of the TiAl-based intermetallic compound sintered body of the comparative example.
- FIG. 8 is a diagram of the metal structure of the TiAl-based intermetallic compound sintered body of the example.
- FIG. 9 is a diagram of the metal structure of the TiAl-based intermetallic compound sintered body of the example.
- FIG. 10 is a graph showing the relationship between the Ni content and the sintered density.
- FIG. 11 is a table showing the sintered density of the example and the comparative example.
- FIG. 12 is a diagram of the metal structure of the TiAl-based intermetallic compound sintered body of the comparative example.
- FIG. 13 is a diagram of the metal structure of the TiAl-based intermetallic compound sintered body of the example.
- FIG. 14 is a diagram of the metal structure of the TiAl-based intermetallic compound sintered body of the example.
- FIG. 15 is a graph showing the relationship between the Ni and Fe contents and the sintered density.
- FIG. 16 is a table showing the sintered density of the example and the comparative example.
- FIG. 17 is a diagram of the metal structure of the TiAl-based intermetallic compound sintered body of the comparative example.
- FIG. 18 is a diagram of the metal structure of the TiAl-based intermetallic compound sintered body of the example.
- FIG. 1 is a block diagram showing a configuration of a sintered body manufacturing system according to the first embodiment.
- a sintered body manufacturing system 1 according to the first embodiment is a system for executing a method of manufacturing a sintered body of a TiAl-based intermetallic compound.
- the TiAl-based intermetallic compound sintered body is a sintered body mainly composed of a TiAl-based intermetallic compound (TiAl-based alloy).
- the TiAl-based intermetallic compound in the present embodiment is a compound in which Ti (titanium) and Al (aluminum) are bonded (TiAl, Ti 3 Al, Al 3 Ti, etc.).
- the TiAl-based intermetallic compound may be a solution in which a mixed metal M described later is dissolved in a TiAl phase that is a phase in which Ti and Al are bonded.
- the sintered body manufacturing system 1 includes a powder manufacturing apparatus 10, a metal powder injection molding apparatus 20, a degreasing apparatus 30, and a sintering apparatus 40.
- the sintered body manufacturing system 1 manufactures powder of TiAl-based intermetallic compound with a powder manufacturing apparatus 10, and metal powder injection molding with a binder by a metal powder injection molding apparatus 20, and metal powder injection with a sintering apparatus 40.
- the formed compact is sintered to produce a TiAl-based intermetallic compound sintered body (TiAl-based intermetallic compound sintered body).
- TiAl-based ingot A 1 is an ingot of the above-described TiAl-based intermetallic compound.
- the TiAl-based ingot A 1 is obtained by dissolving an additive metal in the TiAl phase of a TiAl-based intermetallic compound.
- the additive metal in the first embodiment is Ni (nickel).
- TiAl-based ingot A 1 has a TiAl-based intermetallic compound content of 99 wt% or more and 99.99 wt% or less, and the content of Ni as an additive metal is 0.01 wt% or more and 1 wt% or less. It is. Further, the content of Ni as the additive metal is more preferably 0.2 wt% or more and 0.6 wt% or less.
- the TiAl-based intermetallic compound in the TiAl-based ingot A 1 contains 20 to 80 wt% Ti, 20 to 80 wt% Al, and 0 to 30 wt% mixed metal M. That is, the TiAl-based ingot A 1 has a Ti content of 19.8 wt% or more and 79.992 wt% or less, and an Al content of 19.8 wt% or more and 79.992 wt% when viewed from all components including the added metal.
- the mixed metal M is 0 wt% or more and 29.997 wt% or less.
- the mixed metal M is in the form of a solid solution in the TiAl phase.
- the mixed metal M is a metal other than Ti and Al, and contains at least one of Nb (niobium), Cr (chromium), and Mn (manganese), for example.
- the TiAl-based ingot A 1 is an alloy lump in which Ni as an additive metal and mixed metal M are dissolved in the TiAl phase of the TiAl-based intermetallic compound.
- the TiAl-based ingot A 1 is manufactured by melting and mixing pure metals (Ti, Al, Ni, mixed metal M) of each component and then cooling.
- FIG. 2 is an explanatory diagram schematically illustrating the configuration of the powder manufacturing apparatus according to the first embodiment.
- the powder manufacturing apparatus 10 includes a heating body 12 and a gas injection body 14.
- Heating body 12 is a heating wire that is coiled around the TiAl-based ingot A 1.
- Heating body 12 generates heat when current flows, melting the TiAl-based ingot A 1.
- the molten TiAl-based ingot A 1 is dropped as a liquid TiAl-based melt A 2 in the vertical direction below the TiAl-based ingot A 1 .
- the gas injection body 14 is an injection tube that allows an inert gas G (argon in the present embodiment) to flow inside and injects the inert gas G from an opening. Opening of the gas injection member 14, with respect to TiAl-based ingot A is located vertically below the 1, TiAl-based ingot A TiAl-based melt A 2 dripped downward in the vertical direction of 1, inert gas G is injected. The TiAl-based melt A 2 to which the inert gas G has been injected is cooled and solidified while being divided into a plurality of pieces, and becomes a plurality of TiAl-based solid solution powders B 1 .
- the gas injection body 14 is plural, the number may be single and the number is arbitrary.
- TiAl-based solid solution powder B 1 Since the TiAl-based solid solution powder B 1 is manufactured by melting and solidifying the TiAl-based ingot A 1 , the contained metal component is the same as that of the TiAl-based ingot A 1 . That, TiAl-based solid solution powder B 1 represents an alloy powder Ni and mixed metal M as an additive metal TiAl phase is a solid solution of TiAl-based intermetallic compound (particles). Then, TiAl-based solid solution powder B 1 represents the content ratio of the metal components is the same as the TiAl-based ingot A 1.
- the particle size of the TiAl-based solid solution powder B 1 represents, 1 [mu] m or more 50 ⁇ m or less, more preferably 1 [mu] m or more 20 ⁇ m or less.
- TiAl based solid solution powder B 1 represents a single powder (particle), a plurality of the aggregate of TiAl-based solid solution powder B 1, referred to as TiAl-based powder material B 2.
- a metal powder injection molding apparatus 20 shown in FIG. 1 is an apparatus that performs metal powder injection molding (MIM).
- the metal powder injection molding apparatus 20 manufactures a molded body D from the mixture C.
- the mixture C is a mixture of the TiAl-based powder B 2 manufactured by the powder manufacturing apparatus 10 and a binder.
- the binder is for joining the TiAl-based solid solution powder B 1 between the TiAl-based powder body B 2 is a resin having fluidity.
- the mixture C is provided with fluidity and moldability by adding a binder.
- the metal powder injection molding apparatus 20 injects the mixture C into the mold.
- the mixture C injected into the mold forms a molded body D. Since the molded body D is provided with fluidity by adding a binder, the molded body D is maintained in a shape defined by the mold even when it is removed from the mold.
- the degreasing device 30 is a device for degreasing the molded body D. Specifically, the degreasing apparatus 30 accommodates the molded body D taken out from the mold and heats the interior to a degreasing temperature, thereby removing (degreasing) the binder from the molded body D, and degreasing A field E is generated.
- the degreasing temperature is a temperature equal to or higher than the temperature at which the binder is thermally decomposed.
- Sintering device 40 houses a degreased body E therein, sintered by heating the interior sintering temperature, the brown body E sintering (a TiAl-based solid solution powder B 1 together in degreased body E ) To produce a TiAl-based intermetallic compound sintered body F.
- the sintering temperature is a temperature at which the TiAl-based solid solution powders B 1 can be sintered with each other, for example, between 1400 ° C. and 1500 ° C.
- the sintering apparatus 40 promotes sintering by maintaining the inside at a sintering temperature for a predetermined time (for example, 1 hour).
- the sintering device 40 may be a device different from the degreasing device 30 or the same device as the degreasing device 30.
- the sintering apparatus 40 is the same apparatus as the degreasing apparatus 30, the temperature is continuously raised to the sintering temperature without decreasing the temperature from the degreasing temperature.
- TiAl-based intermetallic compound sintered body F is for the TiAl-based solid solution powder B 1 together in degreased body E is obtained by sintering, the same components as TiAl-based solid solution powder B 1, containing only the same ratio . That is, in the TiAl-based intermetallic compound sintered body F, the content of the TiAl-based intermetallic compound is 99% by weight or more and 99.99% by weight or less, and the content of Ni as the additive metal is 0.01% by weight. % To 1% by weight. Further, the content of Ni as the additive metal is more preferably 0.2 wt% or more and 0.6 wt% or less.
- the TiAl intermetallic compound in the TiAl intermetallic compound sintered body F contains 20 to 80% by weight of Ti, 20 to 80% by weight of Al, and 0 to 30% by weight of the mixed metal M. To do. That is, in the TiAl-based intermetallic compound sintered body F, Ti is 19.8% by weight or more and 79.992% by weight or less and Al is 19.8% by weight or more when viewed from all the components including the added metal. 79.992% by weight or less, and the mixed metal M is 0% by weight or more and 29.997% by weight or less.
- TiAl-based solid solution powder B 1 joined by sintering, and TiAl based sintered powder F1.
- the TiAl-based intermetallic compound sintered body F is obtained by bonding (welding) a plurality of TiAl-based sintered powders F1 by forming a neck.
- TiAl based solid solution powder B 1 represents, in TiAl-based intermetallic the compound (TiAl Aiuchi), Ni as an additive metal is solid-solved.
- Ni as the additive metal is not dissolved in the TiAl-based intermetallic compound (in the TiAl phase), and the phase is divided into the TiAl phase and the additive metal phase (Ni phase).
- the TiAl-based intermetallic compound (TiAl phase) in the TiAl-based intermetallic compound sintered body F contains Ti, Al, and the mixed metal M, and does not contain Ni.
- FIG. 3 is a schematic diagram for explaining phases of the TiAl-based intermetallic compound sintered body according to the first embodiment.
- the TiAl phase in the TiAl-based sintered powder F1 is referred to as TiAl phase F2
- the additive metal phase (Ni phase) is referred to as additive metal phase F3.
- the Ni phase (added metal phase F3) is between adjacent TiAl-based sintered powders F1 (grain boundaries), that is, TiAl phase F2 of one TiAl-based sintered powder F1 and adjacent thereto.
- the Ni phase (added metal phase F3) exists around each of the plurality of TiAl-based intermetallic compounds (TiAl phase F2).
- the sintered density of the TiAl-based intermetallic compound sintered body F is improved because the added metal phase F3 is present at the grain boundary between the adjacent TiAl phases F2.
- FIG. 4 is a flowchart for explaining a manufacturing flow of the TiAl-based intermetallic compound sintered body by the sintered body manufacturing system according to the first embodiment.
- the sintered body manufacturing system 1 first generates a plurality of TiAl-based solid solution powders B 1 (TiAl-based powder bodies B 2 ) from the TiAl-based ingot A 1 by the powder manufacturing apparatus 10. (Step S10).
- the sintered body manufacturing system 1 After generating the TiAl-based solid solution powder B 1, the sintered body manufacturing system 1 generates a mixture C by mixing a TiAl-based powder body B 2 and a binder (step S12), the metal powder injection molding device 20 Thus, the mixture C is injection molded to form the molded body D (step S14). After molding the molded body D, the sintered body manufacturing system 1 generates the degreased body E by degreasing the molded body D by the degreasing apparatus 30 (step S16), and sinters the degreased body E by the sintering apparatus 40 Then, a TiAl-based intermetallic compound sintered body F is generated (step S18). By Step S18, the manufacturing process of the TiAl-based intermetallic compound sintered body is completed.
- the manufacturing method of the TiAl-based intermetallic compound sintered body F executed by the sintered body manufacturing system 1 according to the present embodiment sinters the TiAl-based powder body B 2 to obtain the TiAl-based intermetallic compound.
- a sintered body F is produced.
- TiAl based powder body B 2 contains the additive metal and TiAl-based intermetallic compound Ti and Al are bonded.
- the additive metal is Ni in the first embodiment.
- the method for producing the TiAl-based intermetallic compound sintered body F sinters the TiAl-based powder body B 2 containing the TiAl-based intermetallic compound and the additive metal.
- a metal structure in which the additive metal phase F3 exists at the grain boundary of the adjacent TiAl phase F2 can be obtained. Therefore, the manufacturing method of this TiAl-based intermetallic compound sintered body F can increase the sintering density and the strength.
- the manufacturing method of the TiAl-based intermetallic compound sintered body F executed by the sintered body manufacturing system 1 includes a mixing step, an injection molding step, a degreasing step, and a sintering step.
- Mixing step to obtain a mixture C by mixing a TiAl-based powder body B 2 and a binder.
- the mixture C is formed into a molded body D by a metal powder injection molding machine (metal powder injection molding apparatus 20).
- the degreasing step the molded body D is degreased to produce a degreased body E.
- the degreased body E is sintered to produce a TiAl-based intermetallic compound sintered body F.
- the manufacturing method of this TiAl type intermetallic compound sintered body F manufactures the TiAl type intermetallic compound sintered body F using a metal powder injection molding method.
- a metal powder injection molding method it is necessary to sinter while maintaining the molded shape.
- the sintering conditions for sintering while maintaining the molded shape are severe, such as a narrow sintering temperature range. ing. Therefore, when producing a sintered body of TiAl-based intermetallic compound by the metal powder injection molding method, the sintering conditions cannot be set appropriately, and it may be difficult to improve the sintered density while maintaining the molded shape. There is.
- the TiAl-based intermetallic compound sintered body F can have a metal structure in which the additive metal phase F3 exists at the grain boundary of the adjacent TiAl phase F2. Therefore, the manufacturing method of the TiAl-based intermetallic compound sintered body F can improve the shape accuracy by the metal powder injection molding method while keeping the sintered density high.
- the content of Ni is 1 wt% or less than 0.01 wt%.
- the sintering apparatus 40 can appropriately cause the additive metal phase F3 to exist at the grain boundary of the adjacent TiAl phase F2. Therefore, the manufacturing method of this TiAl-based intermetallic compound sintered body F can improve the sintering density more appropriately.
- TiAl-based powder block B 2 is obtained by mixing a plurality of TiAl-based solid solution powder B 1 containing the additive metal and TiAl-based intermetallic compound.
- the TiAl-based intermetallic compound sintered body F is manufactured by using a TiAl-based solid solution powder B 1 used for sintering as a powder containing a TiAl-based intermetallic compound and an additive metal, so that TiAl of the sintered body is obtained.
- the added metal phase F3 can be appropriately present at the grain boundary of the phase F2. Therefore, the manufacturing method of this TiAl-based intermetallic compound sintered body F can improve the sintering density more appropriately.
- the TiAl-based intermetallic compound sintered body F includes a TiAl-based intermetallic compound in which Ti and Al are bonded and an additive metal that is Ni, and the content of Ni is 0.01 wt. % To 1% by weight. Since this TiAl-based intermetallic compound sintered body F contains Ni in this compounding ratio with respect to the TiAl-based intermetallic compound, the additive metal phase F3 is present at the grain boundary of the TiAl phase F2 of the sintered body. It becomes possible. Therefore, this TiAl-based intermetallic compound sintered body F can improve the sintering density more appropriately.
- the TiAl-based intermetallic compound sintered body F contains 20 to 80% by weight of Ti, 20 to 80% by weight of Al, and 0 to 30% by weight of the mixed metal M,
- the mixed metal M contains at least one of Nb, Cr, and Mn.
- the TiAl-based intermetallic compound sintered body F has improved strength because the TiAl-based intermetallic compound has this blending ratio.
- TiAl-based intermetallic compound sintered body F a plurality of TiAl-based sintered powders F1 containing a TiAl-based intermetallic compound and an additive metal are bonded, and the additive metal phase that is the metal phase of the additive metal is adjacent to the TiAl-based intermetallic compound sintered body F. Between the TiAl-based sintered powder F1. In this TiAl-based intermetallic compound sintered body F, since the additive metal phase F3 is present at the grain boundary of the TiAl phase F2 of the sintered body, the sintered density can be improved more appropriately.
- the second embodiment is different from the first embodiment in that Ni and Fe (iron) are used as additive metals.
- description of portions having the same configuration as that of the first embodiment is omitted.
- the additive metals according to the second embodiment are Ni and Fe.
- the content of the TiAl-based intermetallic compound is 98 wt% or more and 99.99 wt% or less
- the total content of Ni and Fe as additive metals is 0. 0.01% by weight or more and 2% by weight or less.
- Ni is contained in an amount of 0.01% by weight or more and less than 2% by weight, and more preferably 0.01% by weight or more and 1% by weight or less with respect to the total amount of Ni and Fe.
- a TiAl-based intermetallic compound sintered body F is generated by the same method as in the first embodiment, using this TiAl-based ingot A 1 containing Ni and Fe as additive metals.
- the content of the TiAl-based intermetallic compound is 98 wt% or more and 99.99 wt% or less, and the total content of Ni and Fe is 0. 0.01% by weight or more and 2% by weight or less.
- the TiAl-based intermetallic compound sintered body F according to the second embodiment forms the same phase as in the first embodiment. That is, in the TiAl-based intermetallic compound sintered body F according to the second embodiment, the alloy phase of Ni and Fe (added metal phase F3) is between adjacent TiAl-based sintered powders F1 (grain boundaries), that is, It exists between the TiAl phase F2 of one TiAl-based sintered powder F1 and the TiAl phase F2 of the TiAl-based sintered powder F1 adjacent thereto. Accordingly, the sintered density of the TiAl-based intermetallic compound sintered body F according to the second embodiment is also improved because the added metal phase F3 is present at the grain boundary between the adjacent TiAl phases F2.
- the total content of Ni and Fe is 0.01 wt% or more and 2 wt% or less.
- the sintering apparatus 40 can appropriately cause the additive metal phase F3 to exist at the grain boundary of the adjacent TiAl phase F2. Therefore, the manufacturing method of the TiAl-based intermetallic compound sintered body F according to the second embodiment can also improve the sintering density more appropriately.
- the TiAl-based intermetallic compound sintered body F includes a TiAl-based intermetallic compound in which Ti and Al are combined, and an additive metal that is Fe and Ni, and the total content of Fe and Ni is The total content is 0.01% by weight or more and 2% by weight or less. Since this TiAl-based intermetallic compound sintered body F contains Fe and Ni in this compounding ratio with respect to the TiAl-based intermetallic compound, the additive metal phase F3 is added to the grain boundary of the TiAl phase F2 of the sintered body. It becomes possible to exist. Therefore, this TiAl-based intermetallic compound sintered body F can improve the sintering density more appropriately.
- the sintering density of the TiAl-based intermetallic compound sintered body F can be improved more appropriately by using Ni or Ni and Fe as the additive metal. Can do.
- the TiAl-based powder body a mixture of a TiAl-based powder that is a powder of a TiAl-based intermetallic compound and an additive metal powder containing Ni as an additive metal is used. Different from the embodiment. In the third embodiment, description of portions having the same configuration as that of the first embodiment is omitted.
- the powder manufacturing apparatus 10 manufactures a TiAl-based powder B 1 a from a TiAl-based ingot A 1 a.
- TiAl-based ingot A 1 a does not contain Ni as an additive metal, but contains only a TiAl-based intermetallic compound.
- the TiAl-based intermetallic compound here is Ti, Al, and mixed metal M as in the first embodiment, and the blending ratio is the same as in the first embodiment.
- the TiAl-based powder B 1 a is a powder containing Ti, Al, and a mixed metal M, and has the same content ratio as the TiAl-based ingot A 1 a.
- the particle size of the TiAl-based powder B 1 a is the same as TiAl-based solid solution powder B 1 of the first embodiment.
- a plurality of TiAl-based powders B 1 a and a plurality of additive metal powders B 3 a are mixed to produce a TiAl-based powder body B 2 a.
- the additive metal powder B 3 a is a Ni powder. That is, the TiAl-based powder body B 2 a has powders of two different components, that is, a TiAl-based intermetallic compound powder and a Ni powder that is an additive metal powder.
- the content ratio of the TiAl-based intermetallic compound and Ni is the same as that of the TiAl-based powder body B 2 according to the first embodiment.
- the particle size of the added metal powder B 3 a is the same range as TiAl-based powder B 1 a, and more preferably less than TiAl-based powder B 1 a.
- the particle size of the additive metal powder B 3 a is preferably 0.01 times or more and 0.2 times or less that of the TiAl-based powder B 1 a.
- the sintered body manufacturing system 1 according to the third embodiment generates the mixture C by mixing the TiAl-based powder body B 2a and the binder, and thereafter the sintered body manufacturing system 1 according to the third embodiment.
- the process is the same as in the first embodiment, and the same TiAl-based intermetallic compound sintered body F as in the first embodiment is manufactured.
- the TiAl-based powder body B 2 a according to the third embodiment includes a TiAl-based powder B 1 a that is a powder of a TiAl-based intermetallic compound, an additive metal powder B 3 a that contains Ni as an additive metal, and A mixture of a plurality of Even in such a case, the same TiAl-based intermetallic compound sintered body F as in the first embodiment can be manufactured. Therefore, the sintered body manufacturing system 1 according to the third embodiment is the first embodiment. Similar to the form, the sintered density can be appropriately improved.
- the additive metal powder B 3 a may be Ni and Fe powder.
- the additive metal powder B 3 a may be Ni powder and Fe powder, or may be an alloy powder of Ni and Fe.
- the TiAl-based powder body B 2 a has the same content ratio of the TiAl-based intermetallic compound to Ni and Fe as the TiAl-based powder body B 2 according to the second embodiment. Further, the additive metal powder body B 2 a has the same content ratio of Ni and Fe as in the first embodiment.
- the additive metal is Ni, or Ni and Fe.
- the additive metal is only Fe, if the Fe content is 2% by weight or more, the sintered density is similarly reduced. Can be high.
- the content of Fe is preferably 5% by weight or less in order to suppress a decrease in strength (creep strength) of the sintered body and a decrease in oxidation resistance.
- FIG. 5 is a table showing the sintered density of the example and the comparative example.
- 6 and 7 are diagrams of the metal structure of the TiAl-based intermetallic compound sintered body of the comparative example.
- 8 and 9 are diagrams of the metal structure of the TiAl-based intermetallic compound sintered body of the example.
- FIG. 10 is a graph showing the relationship between the Ni content and the sintered density.
- a compact formed by a metal powder injection molding machine was degreased and then sintered at a sintering temperature of 1450 ° C. for 2 hours to produce a TiAl-based intermetallic compound sintered body F.
- a compact formed by a metal powder injection molding machine is degreased in the same manner as in the examples, and then sintered at a sintering temperature of 1450 ° C. for 2 hours to obtain a TiAl-based intermetallic compound sintered body Fx.
- the TiAl-based intermetallic compound sintered body F according to each example includes 30% by weight of Al, 14% by weight of Nb as the mixed metal M, and 0.7% by weight of Cr as the mixed metal M, The same applies to the TiAl-based intermetallic compound sintered body Fx according to each comparative example.
- the TiAl-based intermetallic compound sintered body Fx according to Comparative Example 1 does not contain both Fe and Ni. More specifically, in the TiAl-based intermetallic compound sintered body Fx according to Comparative Example 1, the Fe content is less than 0.05% by weight and the Ni content is less than 0.01% by weight. Further, as shown in FIG. 5, the TiAl-based intermetallic compound sintered body Fx according to Comparative Example 2 has a Fe content of less than 0.05% by weight and a Ni content of 1.05% by weight. . As shown in FIG. 5, the TiAl-based intermetallic compound sintered body F according to Example 1 contains only Ni as an additive metal, and the content of Ni is 0.2% by weight of the whole, The Fe content is less than 0.05% by weight.
- the TiAl-based intermetallic compound sintered body F according to Example 2 contains only Ni as an additive metal, the Ni content is 0.6% by weight, and the Fe content is the whole. Of 0.05% by weight or less.
- the method of the third embodiment that is, the manufacturing method of mixing TiAl-based powder B 1 a and additive metal powder B 3 a was applied.
- the TiAl-based intermetallic compound sintered body Fx according to Comparative Example 1 has a sintered density of 91% and has a large number of pores V as shown in FIG. 6.
- the TiAl-based intermetallic compound sintered body Fx according to Comparative Example 2 has a sintered density of 97%, and as shown in FIG. Colonies of A ⁇ -phase colony is a lump of a ⁇ -phase, and deteriorates the performance of a TiAl-based intermetallic compound sintered body having a lamellar structure.
- the TiAl-based intermetallic compound sintered body F according to Example 1 has a sintered density of 98%, as shown in FIG. 5, has a small number of pores V, and has a ⁇ phase as shown in FIG. No colony has been generated.
- the sintered TiAl-based intermetallic compound F according to Example 2 has a sintered density of 97%, and as shown in FIG. 9, there are few voids V and ⁇ -phase colonies. Neither has occurred.
- FIG. 10 is a plot of the results of Comparative Examples 1 and 2 and Examples 1 and 2.
- the TiAl-based intermetallic compound sintered body F containing only Ni as an additive metal has a high sintering density when Ni is contained in an amount of 0.1 wt% or more and 1 wt% or less, Generation of ⁇ -phase colonies can be suppressed.
- FIG. 11 is a table showing the sintered density of the example and the comparative example.
- FIG. 12 is a diagram of the metal structure of the TiAl-based intermetallic compound sintered body of the comparative example.
- 13 and 14 are diagrams of the metal structure of the TiAl-based intermetallic compound sintered body of the example.
- FIG. 15 is a graph showing the relationship between the Ni and Fe contents and the sintered density.
- the TiAl-based intermetallic compound sintered body Fx according to Comparative Example 3 has a Ni content of 0.34% by weight and a Fe content of 1.79% by weight. That is, the TiAl-based intermetallic compound sintered body Fx according to Comparative Example 3 has a total content of Ni and Fe of 2.13% by weight.
- the TiAl-based intermetallic compound sintered body F according to Examples 3 and 4 has a Ni content of 0.17% by weight and a Fe content of 0.92% by weight. That is, in the TiAl-based intermetallic compound sintered body F according to Examples 3 and 4, the total content of Ni and Fe is 1.09% by weight.
- the TiAl-based intermetallic compound sintered body Fx according to Comparative Example 3 is the same method as in the third embodiment, and in Example 4, the method of the third embodiment, that is, the TiAl-based powder B 1 a and applying the method of mixing the additive metal powder B 3 a.
- the method of the first embodiment that is, by applying the manufacturing method using the TiAl-based solid solution powder B 1 containing the additive metal and TiAl-based intermetallic compound.
- the TiAl-based intermetallic compound sintered body Fx according to Comparative Example 3 has a sintered density of 97%, as shown in FIG. Colonies of
- the TiAl-based intermetallic compound sintered body F according to Example 3 has a sintered density of 99%, as shown in FIG. 11, a small number of voids V, and a ⁇ phase, as shown in FIG. No colony has been generated.
- the TiAl-based intermetallic compound sintered body F according to Example 4 has a sintered density of 97% as shown in FIG. 11, a small number of voids V and a ⁇ -phase colony as shown in FIG. Neither has occurred.
- FIG. 15 is a plot of the results of Comparative Examples 1 and 3 and Examples 3 and 4.
- the TiAl-based intermetallic compound sintered body F containing Ni and Fe as additive metals when the total amount of Ni and Fe is 0.1 wt% or more and 2 wt% or less of the whole, The sintered density is high, and the generation of ⁇ -phase colonies can be suppressed.
- Example 3 and Example 4 even if the method of the third embodiment, that is, the production method of mixing the TiAl-based powder B 1 a and the additive metal powder B 3 a, it can be seen that the sintering density can be increased even by the method, that is, the production method using the TiAl-based solid solution powder B 1 containing the TiAl-based intermetallic compound and the additive metal.
- FIG. 16 is a table showing the sintered density of the example and the comparative example.
- FIG. 17 is a diagram of the metal structure of the TiAl-based intermetallic compound sintered body of the comparative example.
- FIG. 18 is a diagram of the metal structure of the TiAl-based intermetallic compound sintered body of the example.
- the TiAl-based intermetallic compound sintered body Fx according to Comparative Example 4 has an Fe content of 1.08% by weight and an Ni content of less than 0.01% by weight.
- the Fe content is 2.13 wt% and the Ni content is less than 0.01 wt%.
- the sintering temperature is 1420 ° C.
- Comparative Example 4 and Comparative Example 1 have the same conditions
- Example 5 has the same conditions as Example 1.
- the TiAl-based intermetallic compound sintered body Fx according to Comparative Example 4 has a sintered density of 93% as shown in FIG. 16 and a large number of voids V as shown in FIG.
- the TiAl-based intermetallic compound sintered body F according to Example 5 has a sintered density of 98%, as shown in FIG. No colony has been generated.
- the TiAl-based intermetallic compound sintered body F can increase the sintering density when the content of Fe is 2 wt% or more when only Fe is used as the additive metal.
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Abstract
Description
図1は、第1実施形態に係る焼結体製造システムの構成を示すブロック図である。第1実施形態に係る焼結体製造システム1は、TiAl系金属間化合物の焼結体の製造方法を実行するためのシステムである。TiAl系金属間化合物焼結体とは、TiAl系金属間化合物(TiAl系合金)を主成分とする焼結体である。本実施形態におけるTiAl系金属間化合物とは、Ti(チタン)とAl(アルミニウム)とが結合した化合物(TiAl、Ti3Al、Al3Ti等)である。ただし、TiAl系金属間化合物は、TiとAlとが結合している相であるTiAl相に、後述する混合金属Mを固溶するものであってもよい。
次に、第2実施形態について説明する。第2実施形態においては、添加金属として、Ni及びFe(鉄)を用いる点で、第1実施形態とは異なる。第2実施形態において、第1実施形態と構成が共通する箇所は、説明を省略する。
次に、第3実施形態について説明する。第3実施形態においては、TiAl系粉末体として、TiAl系金属間化合物の粉末であるTiAl系粉末と、添加金属としてNiを含有する添加金属粉末とを複数混合したものを用いる点で、第1実施形態とは異なる。第3実施形態において、第1実施形態と構成が共通する箇所は、説明を省略する。
次に、実施例について説明する。図5は、実施例と比較例との焼結密度を示す表である。図6及び図7は、比較例のTiAl系金属間化合物焼結体の金属組織の図である。図8及び図9は、実施例のTiAl系金属間化合物焼結体の金属組織の図である。図10は、Niの含有量と焼結密度との関係を示すグラフである。以下説明する各実施例では、金属粉末射出成型機で成形された成形体を脱脂後、焼結温度1450℃で2時間焼結して、TiAl系金属間化合物焼結体Fを製造した。以下説明する各比較例では、実施例と同様に金属粉末射出成型機で成形された成形体を脱脂後、焼結温度1450℃で2時間焼結して、TiAl系金属間化合物焼結体Fxを製造した。各実施例に係るTiAl系金属間化合物焼結体Fは、Alを30重量%、混合金属MとしてのNbを14重量%、混合金属MとしてのCrを0.7重量%含むものであり、各比較例に係るTiAl系金属間化合物焼結体Fxも同様である。
10 粉末製造装置
20 金属粉末射出成型装置
30 脱脂装置
40 焼結装置
A1 TiAl系インゴッド
A2 TiAl系溶融体
B1 TiAl系固溶粉末
B1a TiAl系粉末
B2 TiAl系粉末体
B3a 添加金属粉末
C 混合体
D 成形体
E 脱脂体
F TiAl系金属間化合物焼結体
F1 TiAl系焼結粉末
F2 TiAl相
F3 添加金属相
Claims (10)
- Ti及びAlが結合したTiAl系金属間化合物と、添加金属とを含有するTiAl系粉末体を焼結して、TiAl系金属間化合物焼結体を生成し、
前記添加金属は、Ni、又は、Ni及びFeである、TiAl系金属間化合物焼結体の製造方法。 - 前記TiAl系粉末体とバインダとを混合して混合体を得る混合ステップと、
前記混合体を金属粉末射出成型機によって成形体に成形する射出成型ステップと、
前記成形体を脱脂して脱脂体を生成する脱脂ステップと、
前記脱脂体を焼結して前記TiAl系金属間化合物焼結体を生成する焼結ステップと、を有する、請求項1に記載のTiAl系金属間化合物焼結体の製造方法。 - 前記TiAl系粉末体は、Niの含有量が、0.01重量%以上1重量%以下である、請求項1又は請求項2に記載のTiAl系金属間化合物焼結体の製造方法。
- 前記TiAl系粉末体は、Ni及びFeの合計量が、0.01重量%以上2重量%以下である、請求項1から請求項3のいずれか1項に記載のTiAl系金属間化合物焼結体の製造方法。
- 前記TiAl系粉末体は、前記TiAl系金属間化合物と前記添加金属とを含有するTiAl系固溶粉末を複数混合したものである、請求項1から請求項4のいずれか1項に記載のTiAl系金属間化合物焼結体の製造方法。
- 前記TiAl系粉末体は、前記TiAl系金属間化合物の粉末であるTiAl系粉末と、前記添加金属を含有する添加金属粉末とを複数混合したものである、請求項1から請求項4のいずれか1項に記載のTiAl系金属間化合物焼結体の製造方法。
- Ti及びAlが結合したTiAl系金属間化合物と、Niである添加金属とを含有し、
Niの含有量が、全体の0.01重量%以上1重量%以下である、TiAl系金属間化合物焼結体。 - Ti及びAlが結合したTiAl系金属間化合物と、Ni及びFeである添加金属と、を含有し、
Ni及びFeの合計含有量が、全体の0.01重量%以上2重量%以下である、TiAl系金属間化合物焼結体。 - 前記TiAl系金属間化合物は、20~80重量%のTiと、20~80重量%のAlと、0~30重量%の混合金属とを含有し、前記混合金属は、Nb、Cr、及びMnのうち少なくともいずれか一種を含有する、請求項7又は請求項8に記載のTiAl系金属間化合物焼結体。
- 前記TiAl系金属間化合物と前記添加金属とを含有する複数のTiAl系焼結粉末が結合しており、前記添加金属の金属相である添加金属相は、隣接する前記TiAl系焼結粉末の間に存在する、請求項7から請求項9のいずれか1項に記載のTiAl系金属間化合物焼結体。
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EP17778878.3A EP3415648A4 (en) | 2016-04-05 | 2017-02-21 | Sintered body of TiAl intermetallic compound, and method for producing sintered body of TiAl intermetallic compound |
CA3017441A CA3017441C (en) | 2016-04-05 | 2017-02-21 | Tial-based intermetallic sintered compact and method for producing tial-based intermetallic sintered compact |
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JP7457980B2 (ja) | 2020-02-27 | 2024-03-29 | 三菱重工航空エンジン株式会社 | TiAl基合金の製造方法 |
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EP3415648A4 (en) | 2019-04-17 |
US20190076928A1 (en) | 2019-03-14 |
CA3017441C (en) | 2021-10-26 |
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EP3415648A1 (en) | 2018-12-19 |
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