WO2021192554A1 - 耐酸化合金及び耐酸化合金の製造方法 - Google Patents
耐酸化合金及び耐酸化合金の製造方法 Download PDFInfo
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- WO2021192554A1 WO2021192554A1 PCT/JP2021/001863 JP2021001863W WO2021192554A1 WO 2021192554 A1 WO2021192554 A1 WO 2021192554A1 JP 2021001863 W JP2021001863 W JP 2021001863W WO 2021192554 A1 WO2021192554 A1 WO 2021192554A1
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- 239000000956 alloy Substances 0.000 title claims abstract description 177
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- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 127
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 57
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
- B22F7/062—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools involving the connection or repairing of preformed parts
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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
- B22F3/14—Both compacting and sintering simultaneously
- B22F3/15—Hot isostatic pressing
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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
- B22F3/02—Compacting only
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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
- B22F3/02—Compacting only
- B22F3/03—Press-moulding apparatus therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
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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
- B22F3/02—Compacting only
- B22F3/04—Compacting only by applying fluid pressure, e.g. by cold isostatic pressing [CIP]
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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
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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
- B22F3/10—Sintering only
- B22F3/105—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding
- B22F2003/1051—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding by electric discharge
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
Definitions
- the present invention relates to an oxidation-resistant alloy and a method for producing an oxidation-resistant alloy.
- Patent Document 1 discloses a method for producing a molybdenum alloy having oxidation resistance by adding a borosilicate of molybdenum or a molybdenum alloy.
- Patent Document 2 discloses a technique for coating with a molybdenum-silicon-boron (Mo-Si-B) alloy using a plasma spraying method.
- Patent Document 3 discloses a technique for coating with a molybdenum-silicon-boron (Mo-Si-B) alloy using sputtering.
- one of the purposes is to provide an oxidation-resistant alloy having oxidation resistance.
- Other objectives can be understood from the following description and description of embodiments.
- the method for producing an oxidation-resistant alloy according to one embodiment for achieving the above object is to produce a first molding material obtained by compression molding a metal powder and a first molding material covered with an alloy powder different from the metal powder. Includes compression molding. Further, the oxidation resistance of the main component of the alloy powder is higher than the oxidation resistance of the main component of the metal powder.
- the oxidation-resistant alloy according to the embodiment for achieving the above object includes an internal structure containing a first metal as a main component and an external structure containing an element forming a compound of the first metal and covering the internal structure. ..
- the distribution of the elements forming the compound of the first metal in the thickness direction of the external structure is uniform.
- the proportion of the first metal compound in the outer structure is different from the proportion of the first metal compound in the inner structure.
- the external structure has a plurality of holes having an aspect ratio of 1.3 or less.
- an oxidation resistant alloy having oxidation resistance can be produced.
- FIG. 1 is a flowchart showing a method for producing an oxidation-resistant alloy according to an embodiment.
- FIG. 2 is a schematic view of the second molding material in one embodiment.
- FIG. 3 is a cross-sectional view of the oxidation resistant alloy according to the embodiment.
- FIG. 4 is a diagram for explaining the structure of the oxidation-resistant alloy in one embodiment.
- FIG. 5 is a flowchart showing a part of the method for producing an oxidation-resistant alloy in one embodiment.
- FIG. 6 is a schematic view of the piece material in one embodiment.
- FIG. 7 is a diagram for explaining a manufacturing process of the oxidation-resistant alloy in one embodiment.
- FIG. 8 is a diagram for explaining a manufacturing process of the oxidation-resistant alloy in one embodiment.
- FIG. 1 is a flowchart showing a method for producing an oxidation-resistant alloy according to an embodiment.
- FIG. 2 is a schematic view of the second molding material in one embodiment.
- FIG. 3 is
- FIG. 9 is a schematic view of the second molding material in one embodiment.
- FIG. 10 is a flowchart showing a part of the method for producing an oxidation-resistant alloy in one embodiment.
- FIG. 11 is a cross-sectional view of the third molding material according to the embodiment.
- FIG. 12 is a cross-sectional view of the oxidation resistant alloy according to the embodiment.
- FIG. 13 is a flowchart showing a part of the method for producing an oxidation-resistant alloy in one embodiment.
- FIG. 14 is a schematic view of the surface piece material in one embodiment.
- FIG. 15 is a diagram for explaining a manufacturing process of the oxidation-resistant alloy in one embodiment.
- FIG. 16 is a perspective sectional view of the second molding material according to the embodiment.
- the oxidation-resistant alloy can be inexpensively produced by the production method 1 shown in FIG.
- the first molding material 100 obtained by compression molding the metal powder is produced.
- the main component of the metal powder includes any metal such as molybdenum (Mo), niobium (Nb), tungsten (W), metal-silicon alloy, metal-boron alloy and the like.
- the metal of the metal-silicon alloy and the metal of the metal-boron alloy may contain molybdenum (Mo), niobium (Nb), tungsten (W) and the like.
- the metal-silicon-boron alloy may be included in both the metal-silicon alloy and the metal-boron alloy.
- the metal-silicon alloy includes, for example, Mo 5 Si 3 , Mo 3 Si, and the like
- the metal-boron alloy includes, for example, Mo B, Mo 2 B, and the like.
- the metal-silicon-boron alloy may contain Mo 5 SiB 2 and the like.
- the main component of the powder may include a material having the largest proportion, for example, mass percent, which constitutes the powder.
- the first molding material 100 may be produced by compression molding without melting the metal powder.
- the first molding material 100 may be formed by using a cold isostatic pressing method (CIP).
- CIP cold isostatic pressing method
- the first molding material 100 may be formed by using mold molding in which compression molding is performed with a mold in one direction, for example, in the vertical direction. As a result, the first molding material 100 can be molded as an unsintered unsintered body.
- the oxidation resistant alloy 300 is produced by compression molding the first molding material 100 covered with the alloy powder.
- the alloy powder is different from the metal powder contained in the first molding material 100.
- the main components of the alloy powder include an alloy having oxidation resistance, for example, a metal-silicon-boron alloy.
- the metal of the metal-silicon-boron alloy may contain molybdenum (Mo), niobium (Nb), tungsten (W), etc., and the metal-silicon-boron alloy may contain Mo 5 SiB 2 , Mo 5 Si 3 , Mo 3 Si, MoB, may also include such Mo 2 B.
- the main component of the alloy powder may have higher oxidation resistance than the main component of the metal powder contained in the first molding material 100.
- Oxidation resistance is the thickness of the oxide produced from the surface or the thickness of the wall thinned when the substance is placed in a space at a desired temperature (for example, 1095 ° C.) for a desired time (for example, 2 hours). For example, it may be represented by an amount in which the thickness of the base material is reduced by sublimation of the surface. The oxidation resistance is higher as the thickness of the oxide or the thickness of the thinned wall is thinner.
- the second molding material 200 may be produced by compression molding without melting the alloy powder.
- the first molding material 100 is covered with an alloy powder.
- the first molding material 100 covered with the alloy powder is compression molded to produce the second molding material 200.
- the second molding material 200 covers the first molding material 100 and has an outer layer 210 formed of an alloy powder.
- the entire circumference of the first molding material 100 may be covered with the alloy powder.
- the second molding material 200 may be produced from the first molding material 100 covered with an alloy powder by using a cold isotropic pressurization method or mold molding.
- the mold used in the compression molding in step S200 may be different from the mold used in the compression molding in step S100.
- the oxidation-resistant alloy 300 may be produced by sintering the second molding material 200.
- the second molding material 200 may be sintered by any method, for example, discharge plasma sintering (SPS), millimeter wave sintering, or the like.
- SPS discharge plasma sintering
- the second molding material 200 may be sintered in a reducing atmosphere, for example hydrogen.
- the second molding material 200 is removed from the mold used in, for example, compression molding and sintered.
- the second molding material 200 is removed from the mold used in compression molding and placed on a floor plate jig.
- the floor plate jig is made of a metal corresponding to the main component of the alloy powder.
- the floor plate jig is formed of molybdenum or a molybdenum-based compound.
- a support jig is arranged according to the shape of the second molding material 200. The support jig suppresses deformation of the second molding material 200 during sintering, for example, deformation due to gravity.
- the oxidation-resistant alloy 300 includes an internal structure 310 and an external structure 320.
- the internal structure 310 has components corresponding to the components of the metal powder contained in the first molding material 100.
- the main component of the internal structure 310 is the same as the component of the metal powder contained in the first molding material 100.
- the external structure 320 also has a component corresponding to the component of the alloy powder covering the first molding material 100.
- the main component of the external structure 320 is the same as the component of the alloy powder covering the first molding material 100.
- the surface of the oxidation resistant alloy 300 has high oxidation resistance.
- the surface of the oxidation resistant alloy 300 is formed by an external structure.
- the main component of the outer structure 320 includes an alloy having oxidation resistance, which is the main component of the alloy powder. Therefore, the oxidation-resistant alloy 300 has high oxidation resistance. Further, since the main component of the metal powder has ductility, the oxidation-resistant alloy 300 may also have ductility.
- the main component of the alloy for example, the main component of the external structure 320 may contain a material having the largest proportion, for example, a mass percent, or may contain five materials from the largest proportion.
- the manufacturing cost can be reduced.
- an oxidation-resistant alloy is produced by coating, the surface is cleaned before coating. Since the coating process and the cleaning process are performed, the production cost is higher than that of the production method 1.
- the cleaning treatment may include a surface treatment step of covering the internal structure with an alloy powder, such as removal of a surface-modified layer. In the manufacturing method 1, this cleaning process can be omitted. Further, since the oxidation-resistant alloy 300 having a near-net shape similar to the product shape can be manufactured, the manufacturing cost can be further reduced.
- the first molding material 100 may be covered so that the distribution of the elements contained in the main component of the alloy powder becomes uniform.
- the distribution of the elements contained in the main component of the outer structure 320 can be uniform.
- the distribution of the elements contained in the main component of the outer structure 320 in the thickness direction of the outer structure 320 can be uniform without changing according to the distance from the surface.
- the elements contained in the main component of the internal structure 310 can be uniformly distributed.
- the outer structure 320 may have a substantially spherical shape, for example, a plurality of holes 322 having an aspect ratio of 1.3 or less.
- the holes 322, 80% or more of the holes 322 have an aspect ratio of 1.3 or less.
- the internal structure 310 may also have a plurality of holes 312 having a substantially spherical shape, for example, an aspect ratio of 1.3 or less.
- the density of the external structure 320 may be 90% or more.
- the density of the internal structure 310 may be 90% or more.
- the oxidation resistant alloy 300 produced by this method can be distinguished from the alloy produced by using the coating treatment.
- the uniform distribution may mean that the ratio of the elements does not fluctuate by 10% or more.
- the ratio of elements may be measured using an electron probe microanalyzer (EPMA).
- EPMA electron probe microanalyzer
- elemental components are measured using an electron probe microanalyzer in a plurality of cross sections of the internal structure 310 or the external structure 320. Thereby, the distribution of the elemental components can be measured.
- the shape of the holes 312 and 222, such as the aspect ratio, can be measured by imaging the cross section of the internal structure 310 or the external structure 320.
- the main component of the alloy powder may contain a compound of the main component of the metal powder.
- the metal that is the main component of the outer structure 320 can be the same as the metal that is the main component of the internal structure 310. Therefore, the coupling force between the outer structure 320 and the inner structure 310 is increased.
- step S200 compression molding and sintering may be performed at the same time.
- the first molding material 100 covered with the alloy powder may be compression-molded by a hot isostatic pressing method (HIP) to produce an oxidation-resistant alloy 300.
- HIP hot isostatic pressing method
- step S200 the method shown in FIG. 5 may be executed.
- step S210 the piece material 220 obtained by compression molding the alloy powder is produced.
- the piece material 220 has a plurality of contact surfaces 225 that can come into contact with the first molded material 100, and at the corners of the first molded material 100, for example, at the apex when the first molded material 100 is a rectangular parallelepiped. It is configured so that it can be placed.
- the thickness L1 of the piece material 220 may be thinner than the thickness of the outer layer 210.
- the thickness L1 of the piece material 220 may be 90% or less of the thickness of the outer layer 210, or 80% or less of the thickness of the outer layer 210.
- the piece material 220 may be produced by compression molding without melting the alloy powder.
- the piece material 220 may be formed by using a cold isostatic pressing method (CIP) or mold molding.
- CIP cold isostatic pressing method
- step S220 the piece material 220 is arranged so that the first molding material 100 is supported by the piece material 220.
- the piece material 220 is arranged at at least a part of the corners of the first molding material 100.
- the piece material 220 may be arranged at the apex of the first molding material 100.
- the piece material 220 may be arranged along the boundary between two planes or curved surfaces, for example, along a side in a rectangular parallelepiped.
- the oxidation resistant alloy 300 is produced by covering the first molding material 100 with the alloy powder and compression molding the first molding material 100 covered with the alloy powder.
- the first molding material 100 is covered with the alloy powder while being supported by the piece material 220.
- the first molding material 100 covered with the alloy powder is compression molded.
- the second molding material 200 may be produced by compression molding without melting the alloy powder.
- the first molding material 100 includes the piece material 220 which is the alloy powder and the outside. Covered with layer 210.
- the second molding material 200 may be produced by using a cold isotropic pressure pressurization method or mold molding.
- the oxidation-resistant alloy 300 is then produced by sintering the second molding material 200 by an arbitrary method.
- the oxidation-resistant alloy 300 can be manufactured using the piece material 220.
- the outer structure 320 of the oxidation resistant alloy 300 can have a uniform thickness. This manufacturing method can reduce the exposure of the internal structure 310 of the oxidation-resistant alloy 300 to the surface of the oxidation-resistant alloy 300.
- step S230 compression molding and sintering may be performed at the same time.
- the first molding material 100 covered with the alloy powder may be compression molded by a hot isotropic heating method.
- step S200 the method shown in FIG. 10 may be performed.
- step S250 the first molding material 100 covered with the alloy powder is compression-molded to generate the second molding material 200.
- the first molding material 100 is covered with an alloy powder.
- the second molding material 200 is produced by compression molding the first molding material 100 covered with the alloy powder.
- the second molding material 200 may be produced by compression molding without melting the alloy powder.
- the second molding material 200 may be produced from the first molding material 100 covered with an alloy powder by using a cold isotropic pressurization method or mold molding.
- the second molding material 200 covered with the oxide powder is compression-molded to produce the oxidation-resistant alloy 300.
- the second molding material 200 is covered with an oxide powder.
- Oxide powders include, for example, aluminum oxide (Al 2 O 3 ), yttrium oxide (Y 2 O 3 ), chromium oxide (Cr 2 O 3 ), zirconia (ZrO 2 ), ytria stabilized zirconia (YSZ), magnesium oxide. It may contain a part such as (MgO) and hafonium oxide (HfO 2).
- the oxide powder may be compression-molded without melting to produce the third molding material 250.
- the first molding material 100 is formed by an outer layer 210 which is an alloy powder. Be covered.
- the second molding material 200 for example, the outer layer 210, is covered with an oxide layer 260 formed of the oxide powder.
- the entire circumference of the second molding material 200 may be covered with the oxide powder.
- the third molding material 250 may be produced by using a cold isotropic pressurization method or mold molding.
- the oxidation-resistant alloy 300 is then produced by sintering the third molding material 250 by an arbitrary method.
- the manufactured oxidation-resistant alloy 300 includes an internal structure 310, an external structure 320, and a surface layer 330. Since the surface layer 330 is formed of an oxide, the oxidation-resistant alloy 300 has high oxidation resistance. Since the internal structure 310 and the external structure 320 are the same as the oxidation-resistant alloy 300 shown in FIG. 3, description thereof will be omitted. Further, since the oxidation-resistant alloy 300 can be produced by one sintering, the production cost can be suppressed.
- step S260 compression molding and sintering may be performed at the same time.
- the second molding material 200 covered with the oxide powder may be compression-molded by a hot isotropic heating method.
- step S230 shown in FIG. 5 the process shown in FIG. 10 may be executed.
- step S250 the first molding material 100 supported by the piece material 220 is covered with the alloy powder, and the first molding material 100 covered with the synthetic alloy is compression-molded to generate the second molding material 200.
- NS Since the subsequent processing is the same as that of the third embodiment, the description thereof will be omitted.
- step S260 shown in FIG. 10 the process shown in FIG. 13 may be executed.
- step S261 as shown in FIG. 14, a surface piece material 420 obtained by compression molding an oxide powder is produced.
- the surface piece material 420 has a plurality of contact surfaces 425 that can come into contact with the second molding material 200, and is configured so that it can be arranged at the corners of the second molding material 200.
- the thickness L2 of the surface piece material 420 may be thinner than the thickness of the oxide layer 260.
- the thickness L2 of the surface piece material 420 may be 90% or less of the thickness of the oxide layer 260, or 80% or less of the thickness of the oxide layer 260.
- the surface piece material 420 may be produced by compression molding without dissolving the oxide powder.
- the surface piece material 420 may be formed by using a cold isostatic pressing method (CIP) or mold molding.
- the surface piece material 420 is arranged so that the second molding material 200 is supported by the surface piece material 420.
- the surface piece material 420 is arranged at at least a part of the corners of the second molding material 200.
- the surface piece material 420 may be arranged at the apex of the second molding material 200.
- step S263 the second molding material 200 is covered with the oxide powder, and the second molding material 200 covered with the oxide powder is compression-molded to produce the oxidation-resistant alloy 300.
- the second molding material 200 is covered with the oxide powder while being supported by the surface piece material 420.
- the second molding material 200 covered with the oxide powder is compression molded.
- the third molding material 250 may be produced by compression molding without melting the oxide powder.
- the second molding material 200 is covered with the surface piece material 420 which is an oxide powder and the oxide powder.
- the third molding material 250 may be produced by using a cold isotropic pressurization method or mold molding.
- the oxidation-resistant alloy 300 is then produced by sintering the third molding material 250 by an arbitrary method.
- the oxidation-resistant alloy 300 can be produced by using the surface piece material 420.
- the surface layer 330 of the oxidation resistant alloy 300 can have a uniform thickness.
- this manufacturing method it is possible to reduce the exposure of the outer structure 320 and the inner structure 310 of the oxidation-resistant alloy 300 to the surface of the oxidation-resistant alloy 300.
- step S263 compression molding and sintering may be performed at the same time.
- the second molding material 200 covered with the oxide powder may be compression-molded by a hot isotropic heating method.
- the oxidation resistant alloy 300 can be manufactured in any shape that can be compression molded.
- a conical oxidation resistant alloy 300 may be produced.
- the piece material 220 may be arranged at the corner of the first molding material 100, for example, at the apex of the cone and at a position along the boundary between the bottom surface and the side surface.
- the oxidation-resistant alloy 300 may include an external structure 320 formed in a plurality of layers.
- the outer structure 320 may be configured so that the oxidation resistance of each layer increases as it approaches the surface of the oxidation-resistant alloy 300.
- the oxidation-resistant alloy 300 can be produced by repeating step S200 of FIG. 1 a plurality of times.
- the sintering process may be performed after all the layers have been compression molded.
- each layer is compression molded without melting the alloy powder.
- the sintering process is performed after all the layers are compression-molded without melting the alloy powder.
- the layered outer structure 320 may be more brittle and more fragile than the inner structure 310.
- the metal powder may contain elements that can reinforce the first metal by addition, such as titanium (Ti), zirconium (Zr), hafnium (Hf), tungsten (W), tantalum (Ta), carbon (C) and the like. ..
- elements that can reinforce the first metal such as titanium (Ti), zirconium (Zr), hafnium (Hf), tungsten (W), tantalum (Ta), carbon (C) and the like. ..
- the oxidation-resistant alloy 300 can have high strength.
- the metal powder may contain the main component of the alloy powder that covers the first molding material 100. This makes it easier for the internal structure 310 to join the external structure 320.
- the alloy powder or oxide powder is an element that is more likely to bind to oxygen than the main component of the first molding material 100, for example, the element having the highest mass percent density of the first molding material 100, such as aluminum (Al), magnesium (Mg), and calcium. (Ca), niobium (Nb), chromium (Cr), titanium (Ti), rare earth elements and the like may be contained. As a result, the oxidation-resistant alloy 300 can have high oxidation resistance.
- the surface layer 330 may be made of ceramics.
- the second molding material 200 covered with the powder of the ceramic-based precursor is compression-molded to produce the oxidation-resistant alloy 300. Since the same is true of the third to fourth embodiments except that the oxide powder replaces the ceramic precursor powder, the description thereof will be omitted.
- the surface piece material 420 obtained by compression molding the powder of the ceramic precursor may be produced. Since it is the same as that of the fifth embodiment except that the oxide powder replaces the ceramic precursor powder, the description thereof will be omitted.
- the method for producing an oxidation-resistant alloy according to the first aspect is to produce a first molding material (100) obtained by compression molding a metal powder (S100), and a first molding material covered with an alloy powder different from the metal powder. (100) is compression-molded (S200). Further, the oxidation resistance of the main component of the alloy powder is higher than the oxidation resistance of the main component of the metal powder.
- the oxidation-resistant alloy (300) produced includes an internal structure (310) and an external structure (320) that covers the internal structure (310), and the oxidation resistance of the external structure (320) is that of the internal structure (310). Higher than oxidation resistance. Therefore, the produced oxidation-resistant alloy (300) has high oxidation resistance.
- the method for producing an oxidation-resistant alloy according to the second aspect is the method for producing an oxidation-resistant alloy according to the first aspect, and the production of the first molding material (100) is a metal without melting the metal powder. It is configured to include compression molding of the powder.
- the first molded material (100) is an unsintered body molded without sintering, the manufacturing cost can be suppressed.
- the method for producing an oxidation-resistant alloy according to the third aspect is the method for producing an oxidation-resistant alloy according to the first aspect, in which the first molding material (100) is compression-molded (S200) to produce an alloy powder. It is configured to include compression molding the alloy powder without melting to produce a second molding material (200) and sintering the second molding material.
- the method for producing an oxidation-resistant alloy according to the fourth aspect is the method for producing an oxidation-resistant alloy according to the first aspect, in which the first molding material (100) is compression-molded (S200) to produce an alloy powder. It is configured to include producing a compression-molded piece material (220) (S210) and supporting the first molded material (100) with the piece material (220) (S220). Further, compression molding (S200) of the first molding material (100) includes covering the first molding material (100) with alloy powder (S230).
- the method for producing an oxidation-resistant alloy according to a fifth aspect is the method for producing an oxidation-resistant alloy according to a fourth aspect, and supporting the first molding material (100) (S220) is the first molding material. It is configured to include placing the piece material (220) at the corner of (100).
- the method for producing an oxidation-resistant alloy according to the sixth aspect is the method for producing an oxidation-resistant alloy according to the fourth aspect, in which the piece material (220) can be produced without melting the alloy powder. Is configured to include compression molding.
- the piece material (220) is formed without sintering, the manufacturing cost can be suppressed.
- the method for producing an oxidation-resistant alloy according to the seventh aspect is the method for producing an oxidation-resistant alloy according to the first aspect, wherein the main component of the metal powder contains the first metal and the main component of the alloy powder is the first. It is configured to contain metal compounds.
- the method for producing an oxidation-resistant alloy according to the eighth aspect is the method for producing an oxidation-resistant alloy according to the first aspect, and the metal powder is configured to contain the main component of the alloy powder.
- the method for producing an oxidation-resistant alloy according to a ninth aspect is the method for producing an oxidation-resistant alloy according to a first aspect, in which the first molding material (100) is compression-molded (S200). It is configured to include covering everything around the material (100) with alloy powder.
- the method for producing an oxidation-resistant alloy according to a tenth aspect is the method for producing an oxidation-resistant alloy according to the first aspect, wherein the first molding material (100) is compression-molded (S200) with an alloy powder.
- the covered first molding material (100) is compression-molded to produce the second molding material (200) (S250), and the second molding material covered with an oxide powder or a ceramic precursor powder (S250). 200) is configured to include compression molding (S260).
- the produced oxidation-resistant alloy (300) includes a surface layer (330). Since the surface layer (330) having high oxidation resistance covers the outer structure (320), the oxidation resistant alloy (300) can have high oxidation resistance.
- the oxidation-resistant alloy of each embodiment is grasped as follows, for example.
- the oxidation-resistant alloy according to the eleventh embodiment includes an internal structure (310) containing a first metal as a main component and an external structure (320) containing an element forming a compound of the first metal and covering the internal structure. ..
- the distribution of the elements forming the compound of the first metal in the thickness direction of the outer structure (320) is uniform.
- the proportion of the first metal compound in the outer structure (320) is different from the proportion of the first metal compound in the inner structure (310).
- the external structure (320) has a plurality of holes (322) having an aspect ratio of 1.3 or less.
- an oxidation-resistant alloy (300) having such a structure is manufactured.
- the produced oxidation-resistant alloy (300) has high oxidation resistance.
Abstract
Description
図1に示す製造方法1により、安価に耐酸化合金を製造することができる。ステップS100において、金属粉末を圧縮成形した第1成形材100が生成される。金属粉末の主成分は、任意の金属、例えば、モリブデン(Mo)、ニオブ(Nb)、タングステン(W)、金属‐シリコン系合金、金属‐ボロン系合金などを含む。金属‐シリコン系合金の金属と、金属‐ボロン系合金の金属はモリブデン(Mo)、ニオブ(Nb)、タングステン(W)などを含んでもよい。金属‐シリコン‐ボロン系合金は、金属‐シリコン系合金と金属‐ボロン系合金の両方に含まれてもよい。金属‐シリコン系合金は、例えばMo5Si3、Mo3Siなどを含み、金属‐ボロン系合金は、例えばMoB、Mo2Bなどを含む。金属‐シリコン‐ボロン系合金はMo5SiB2などを含んでもよい。ここで、粉末の主成分は、粉末を構成する割合、例えば質量パーセントが最も大きい材料を含んでもよい。
ステップS200において、図5に示す方法が実行されてもよい。ステップS210において、合金粉末を圧縮成形したピース材220が生成される。ピース材220は、図6に示すように、第1成形材100に接触し得る複数の接触面225を有し、第1成形材100の角、例えば第1成形材100が直方体のとき頂点に配置できるように構成されている。ピース材220の厚さL1は、外部層210の厚さより薄くてもよい。例えば、ピース材220の厚さL1は、外部層210の厚さの90%以下でもよく、外部層210の厚さの80%以下でもよい。
ステップS200において、図10に示す方法が実行されてもよい。ステップS250において、合金粉末で覆われた第1成形材100を圧縮成形して、第2成形材200が生成される。例えば、第1成形材100は合金粉末で覆われる。合金粉末で覆われた第1成形材100を圧縮成形することで、第2成形材200が生成される。
図5に示すステップS230において、図10に示す処理が実行されてもよい。この場合、ステップS250において、ピース材220に支持された第1成形材100を合金粉末で覆い、合成合金で覆われた第1成形材100を圧縮成形して、第2成形材200が生成される。その後の処理は、実施の形態3と同様のため、説明を省略する。
図10に示すステップS260において、図13に示す処理が実行されてもよい。ステップS261において、図14に示すように、酸化物粉末を圧縮成形した表面ピース材420が生成される。表面ピース材420は、第2成形材200に接触し得る複数の接触面425を有し、第2成形材200の角に配置できるように構成されている。表面ピース材420の厚さL2は、酸化物層260の厚さより薄くてもよい。例えば、表面ピース材420の厚さL2は、酸化物層260の厚さの90%以下でもよく、酸化物層260の厚さの80%以下でもよい。
耐酸化合金300は、圧縮成形し得る任意の形状で製造し得る。例えば、円錐形の耐酸化合金300が製造されてもよい。この場合、ピース材220は、図16に示すように、第1成形材100の角、例えば円錐の頂点と、底面と側面との境界に沿った位置とに配置されてもよい。
Claims (11)
- 金属粉末を圧縮成形した第1成形材を生成することと、
前記金属粉末と異なる合金粉末で覆われた前記第1成形材を圧縮成形することと、
を含み、
前記合金粉末の主成分の耐酸化性は、前記金属粉末の主成分の耐酸化性より高い
耐酸化合金の製造方法。 - 前記第1成形材を生成することは、前記金属粉末を融解することなく前記金属粉末を圧縮成形することを含む
請求項1に記載の耐酸化合金の製造方法。 - 前記第1成形材を圧縮成形することは、
前記合金粉末を融解することなく前記合金粉末を圧縮成形して第2成形材を生成することと、
前記第2成形材を焼結することと、
を含む
請求項1または2に記載の耐酸化合金の製造方法。 - 前記第1成形材を圧縮成形することは、
前記合金粉末を圧縮成形したピース材を生成することと、
前記ピース材で前記第1成形材を支持することと、
前記合金粉末で前記第1成形材を覆うことと、
を含む
請求項1から3のいずれか1項に記載の耐酸化合金の製造方法。 - 前記第1成形材を支持することは、前記第1成形材の角に前記ピース材を配置することを含む
請求項4に記載の耐酸化合金の製造方法。 - 前記ピース材を生成することは、前記合金粉末を融解することなく前記合金粉末を圧縮成形することを含む
請求項4または5に記載の耐酸化合金の製造方法。 - 前記金属粉末の主成分は第1金属を含み、
前記合金粉末の主成分は前記第1金属の化合物を含む
請求項1から6のいずれか1項に記載の耐酸化合金の製造方法。 - 前記金属粉末は、前記合金粉末の主成分を含む
請求項1から7のいずれか1項に記載の耐酸化合金の製造方法。 - 前記第1成形材を圧縮成形することは、前記第1成形材の周囲のすべてを前記合金粉末で覆うことを含む
請求項1から8のいずれか1項に記載の耐酸化合金の製造方法。 - 前記第1成形材を圧縮成形することは、
前記合金粉末で覆われた前記第1成形材を圧縮成形して第2成形材を生成することと、
酸化物粉末またはセラミックス系前駆体の粉末で覆われた前記第2成形材を圧縮成形することを含む
請求項1から9のいずれか1項に記載の耐酸化合金の製造方法。 - 第1金属を主成分とする内部構造と、
前記第1金属の化合物を形成する元素を含み、前記内部構造を覆う外部構造と、
を備え、
前記外部構造において、前記第1金属の化合物を形成する元素の、前記外部構造の厚さ方向における分布は均一であり、
前記外部構造における前記第1金属の化合物を形成する元素の割合は、前記内部構造における前記第1金属の化合物を形成する元素の割合と異なり、
前記外部構造は、アスペクト比が1.3以下の複数の孔を有する
耐酸化合金。
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AU2021243424B2 (en) | 2023-10-19 |
EP3995234A4 (en) | 2022-09-07 |
AU2021243424A1 (en) | 2022-02-24 |
US20220274168A1 (en) | 2022-09-01 |
JP7438812B2 (ja) | 2024-02-27 |
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