WO2022191142A1 - 複合焼結体およびその製造方法ならびに接合材 - Google Patents

複合焼結体およびその製造方法ならびに接合材 Download PDF

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Publication number
WO2022191142A1
WO2022191142A1 PCT/JP2022/009780 JP2022009780W WO2022191142A1 WO 2022191142 A1 WO2022191142 A1 WO 2022191142A1 JP 2022009780 W JP2022009780 W JP 2022009780W WO 2022191142 A1 WO2022191142 A1 WO 2022191142A1
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Prior art keywords
sintered body
based alloy
unsintered
bonding material
powder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
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PCT/JP2022/009780
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English (en)
French (fr)
Japanese (ja)
Inventor
真也 日比野
竜太朗 岡田
嘉道 野村
利茂 藤光
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Kawasaki Heavy Industries Ltd
Kawasaki Motors Ltd
Original Assignee
Kawasaki Heavy Industries Ltd
Kawasaki Jukogyo KK
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Application filed by Kawasaki Heavy Industries Ltd, Kawasaki Jukogyo KK filed Critical Kawasaki Heavy Industries Ltd
Priority to US18/280,980 priority Critical patent/US20240149339A1/en
Priority to EP22767098.1A priority patent/EP4306237A4/en
Publication of WO2022191142A1 publication Critical patent/WO2022191142A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550°C
    • B23K35/3033—Ni as the principal constituent
    • B23K35/304—Ni as the principal constituent with Cr as the next major constituent
    • 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
    • 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
    • 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
    • B22F3/10—Sintering only
    • 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
    • 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
    • B22F3/22—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
    • 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
    • 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
    • B22F7/008—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 characterised by the composition
    • 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
    • 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
    • B22F7/064—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 using an intermediate powder layer
    • 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
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
    • 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
    • B23K1/00—Soldering, e.g. brazing, or unsoldering
    • B23K1/19—Soldering, e.g. brazing, or unsoldering taking account of the properties of the materials to be soldered
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
    • 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
    • C22C1/0433—Nickel- or cobalt-based alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
    • C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
    • C22C19/055—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 20% but less than 30%
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
    • C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
    • C22C19/056—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 10% but less than 20%
    • 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
    • B22F2301/15—Nickel or cobalt
    • 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
    • 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
    • B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy

Definitions

  • the present invention relates to a method for manufacturing a composite sintered body, a composite sintered body obtained by the manufacturing method, and a bonding material used in the manufacturing method.
  • a sintered body is obtained, for example, by producing a green body containing a metal powder and a binder by metal powder injection molding, and then degreasing and sintering the green body.
  • Patent Literature 1 discloses a method of performing sintering and bonding at the same time when manufacturing a composite sintered body.
  • Patent Document 1 describes, as an example, the use of powder made of stainless steel in metal powder injection molding. On the other hand, it is desired to join together sintered bodies made of Ni-based alloys.
  • the present invention provides a method for producing a composite sintered body in which sintered bodies made of a Ni-based alloy are bonded together by a dense bonding layer, and a composite sintered body obtained by the manufacturing method.
  • a bonding material that can be suitably used for bonding sintered bodies made of a specific Ni-based alloy.
  • a method for manufacturing a composite sintered body includes the steps of preparing a first presintered body made of powder made of a first Ni-based alloy; a step of preparing a second pre-sintered body composed of a powder made of a base alloy; a step of facing the first pre-sintered body and the second pre-sintered body with a predetermined gap; A Ni-based alloy having a liquidus temperature lower than that of the first Ni-based alloy and the second Ni-based alloy is provided in the space facing the first temporary sintered body and the second temporary sintered body and the gap is opened.
  • a step of installing a bonding material and after the bonding material is installed, heating the first temporary sintered body and the second temporary sintered body to melt the bonding material and permeate the gap. and forming the first sintered body and the second sintered body as the first sintered body and the second sintered body, respectively.
  • preliminarily sintered body means an unsintered body obtained by molding powder into a predetermined shape (powder compact with an open porosity of more than 20% in which particles in the powder are bonded together, or powder A powder compact with an open porosity of 20% or less and more than 2%, which is obtained by heating a powder compact in which the spaces between the particles inside are filled with a binder). A powder compact having an open porosity of 2% or less obtained by heating the body.
  • a method for manufacturing a composite sintered body includes the steps of preparing a first presintered body made of powder of a first Ni-based alloy; a step of preparing a configured second presintered body; and setting the first presintered body and the second presintered body to a liquidus temperature higher than the first Ni-based alloy and the second Ni-based alloy.
  • a step of sandwiching a bonding material made of a low Ni-based alloy between the first temporary sintered body and the second temporary sintered body, and facing the first temporary sintered body and the second temporary A step of heating the sintered body to melt the bonding material, and then forming the first temporary sintered body and the second temporary sintered body into a first sintered body and a second sintered body, respectively.
  • a bonding layer is formed between the first sintered body and the second sintered body by solidifying the molten bonding material. Therefore, it is possible to obtain a composite sintered body in which sintered bodies made of a Ni-based alloy are bonded together by a dense bonding layer.
  • the first sintered body made of the first Ni-based alloy and the second sintered body made of the second Ni-based alloy are composed of the first Ni-based alloy and the second Ni-based alloy.
  • a composite sintered body joined by a joint layer made of a Ni-based alloy having a composition different from that of the alloy, wherein the joint layer is denser than the first sintered body and the second sintered body, and the joint It is characterized in that the thickness of the layer is 200 ⁇ m or more.
  • the bonding material of the present invention contains 18.0 to 23.0% Cr, 1.5 to 6.5% Mo, 3.5 to 8.5% Si, and 13.0% mass percentage. It is characterized by being made of a Ni-based alloy containing Fe below, Nb+Ta of 2.5% or less, and Co of 1.0% or less.
  • the bonding material with the above composition is 18.0 to 25.0% Cr, 7.0 to 11.0% Mo, 22.0% or less Fe, 4.5% or less Nb + Ta, 3.0% It can be suitably used for joining sintered bodies made of Ni-based alloys containing Co as described below.
  • a method for producing a composite sintered body in which sintered bodies made of Ni-based alloys are bonded together by a dense bonding layer is provided.
  • FIG. 1 is a side view of a composite sintered body obtained by a method for manufacturing a composite sintered body according to an embodiment of the present invention
  • FIG. (a) to (c) are diagrams for explaining the manufacturing method. It is a graph which shows the relationship between heating time and heating temperature. 1 is a micrograph of a cross section of a composite sintered body.
  • FIG. 1 shows a composite sintered body 1 obtained by a method for manufacturing a composite sintered body according to one embodiment of the present invention.
  • This composite sintered body 1 is obtained by bonding a first sintered body 11 and a second sintered body 12 with a bonding layer 13 .
  • the first sintered body 11 is made of the first Ni-based alloy
  • the second sintered body 12 is made of the second Ni-based alloy.
  • the first Ni-based alloy and the second Ni-based alloy may have the same composition, or may have different compositions.
  • the bonding layer 13 is made of a Ni-based alloy having a composition different from that of the first Ni-based alloy and the second Ni-based alloy.
  • both the first sintered body 11 and the second sintered body 12 are plate-shaped, and are joined in a state where they are perpendicular to each other. More specifically, the end face of the second sintered body 12 is joined to a portion of the main surface of the first sintered body 11 via the joining layer 13 .
  • first sintered body 11 and the second sintered body 12 and the parts to be joined can be changed as appropriate.
  • first sintered body 11 and the second sintered body 12 may be rod-shaped and joined by the joining layer 13 in a state where their end surfaces are butted against each other.
  • the manufacturing method of the present embodiment includes a step of preparing a first temporary sintered body 2A having a shape similar to that of the first sintered body 11, and a step of includes a step of preparing the second presintered body 3A.
  • the first pre-sintered body 2A is made of powder of a first Ni-based alloy
  • the second pre-sintered body 3A is made of powder of a second Ni-based alloy.
  • the first unsintered body 2 is produced by molding the powder made of the first Ni-based alloy into a predetermined shape, and the first unsintered body 2 is heated to form the first sintered body 11. During the process, the first presintered body 2A is produced. Similarly, a second Ni-based alloy powder is formed into a predetermined shape to produce a second unsintered body 3, and the second unsintered body 3 is heated to form a second sintered body 12. , the second presintered body 3A is produced.
  • first unsintered body 2 during the heating of the first unsintered body 2 to form the first sintered body 11, gravity, friction during shrinkage due to the progress of sintering, Part of the first unsintered body 2 may be deformed due to the influence of sintered bodies, temporary sintered bodies, and sintered bodies being restrained.
  • second unsintered body 3 during the process of heating the second unsintered body 3 to form the second sintered body 12, gravity, friction during shrinkage due to the progress of sintering, A part of the second unsintered body 3 may be deformed due to the influence of restraint between unsintered bodies, between pre-sintered bodies, and between sintered bodies.
  • Each of the first Ni-based alloy and the second Ni-based alloy contains 18.0 to 25.0% Cr and 7.0 to 11.0% Mo in terms of mass percentage (the same applies hereinafter) as essential components other than Ni. contains.
  • Each of the first Ni-based alloy and the second Ni-based alloy contains at least one of 22.0% or less Fe, 4.5% or less Nb+Ta, and 3.0% or less Co as other optional components. may The remainder of the first Ni-based alloy and the second Ni-based alloy other than the components described above is Ni and unavoidable impurities.
  • each of the first Ni-based alloy and the second Ni-based alloy may not contain either Nb or Ta.
  • Ni-based alloys having the above composition include Hastelloy X and IN625 (IN is an abbreviation for Inconel (registered trademark)).
  • the method for producing the first unsintered body 2 and the second unsintered body 3 is not particularly limited, but examples include metal powder injection molding (MIM), press compression molding, and additive manufacturing. Among them are Fused Deposition Modeling (FDM) and Binder Jetting. Either method is a process that ultimately yields a dense metal part through a sintering step.
  • MIM metal powder injection molding
  • FDM Fused Deposition Modeling
  • Binder Jetting Binder Jetting
  • the first unsintered body 2 and the second unsintered body 3 are produced by MIM. Specifically, the powder of the first Ni-based alloy or the second Ni-based alloy is uniformly kneaded with a binder to form a compound, and the compound is injected into a mold cavity. This yields a green body having the same shape as the mold cavity.
  • the average particle diameter (median diameter (d50)) of the powder composed of the first Ni-based alloy or the second Ni-based alloy is, for example, 10 to 60 ⁇ m.
  • the binder is not particularly limited, for example, polypropylene (PP), polyethylene (PE), polyacetal (POM), polymethyl methacrylate (PMMA), carnauba wax (CW), paraffin wax (PW), stearin At least one of acids (St) is included.
  • the gap 4 is, for example, 1-200 ⁇ m.
  • a space 5 facing the first unsintered body 2 and the second unsintered body 3 and having the gap 4 open (in this embodiment, the first A bonding material 6 is placed at a corner portion formed by the main surface of the unsintered body 2 and the main surface of the second unsintered body 3 .
  • the bonding material 6 is made of a Ni-based alloy having a lower liquidus temperature than the first Ni-based alloy and the second Ni-based alloy.
  • the Ni-based alloy constituting the bonding material 6 includes, for example, 18.0 to 23.0% Cr, 1.5 to 6.5% Mo, and 3.5 to 8.5% as essential components other than Ni. of Si and, as other optional components, 13.0% or less of Fe, 2.5% or less of Nb+Ta, and 1.0% or less of Co.
  • the remainder of the Ni-based alloy other than the above-described components is Ni and unavoidable impurities.
  • the bonding material 6 is a mixture of two powders (first powder and second powder) having different compositions.
  • the bonding material 6 may be one type of powder with a single composition.
  • the bonding material 6 does not necessarily have to be powder, and may be paste-like or film-like.
  • the liquidus temperature of the bonding material 6 is the temperature at which all the powders melt.
  • the first powder consists of a third Ni-based alloy having a lower liquidus temperature than the first Ni-based alloy and the second Ni-based alloy, and the second powder consists of the first Ni-based alloy or the second Ni-based alloy.
  • the third Ni-based alloy contains, for example, 16.0 to 22.0% Cr and 8.0 to 12.0% Si in mass percentage. Examples of such Ni-based alloys include AMS4782.
  • Si in the third Ni-based alloy causes the liquidus temperature of the bonding material 6, which is a mixture of the second powder made of the first Ni-based alloy or the second Ni-based alloy, and the first powder made of the third Ni-based alloy, to increase to the first Ni-based alloy. It can be lower than the liquidus temperature of the alloy or the second Ni-based alloy.
  • the mixing ratio of the first powder and the second powder is 40%:60% to 80%:20% in mass percentage.
  • the material of the first powder is AMS4782 (liquidus temperature: 1135°C)
  • the material of the second powder is IN625 (liquidus temperature: 1360°C)
  • the mixing ratio of the first powder and the second powder is 60. %: When it is 40%, the liquidus temperature of the bonding material 6 is 1226°C.
  • the first unsintered body 2 and the second unsintered body 3 are bonded to each other for a certain amount of time (for example, 10 to 20 hours).
  • the first green body 2 and the second green body 3 are heated to a temperature (for example, 400-600° C.) to remove the binder (degreasing).
  • degreasing is performed in a nitrogen atmosphere.
  • the degreasing may be performed under an argon atmosphere.
  • degreasing, preliminary sintering, and main sintering which will be described later, are performed in the same furnace.
  • the first unsintered body 2 and the second unsintered body 3 are sintered at a temporary sintering temperature T1 that is lower than the liquidus temperature T2 of the bonding material 6.
  • T1 temporary sintering temperature
  • the first unsintered body 2 and the second unsintered body 3 are made into the first preliminary sintered body 2A and the second preliminary sintered body 3A, respectively.
  • the first temporary sintered body 2A and the second temporary sintered body 3A are opposed to each other with the gap 4 therebetween, and the first temporary sintered body 2A and the second temporary sintered body
  • the bonding material 6 is placed in the space 5 facing the sintered body 3A and where the gap 4 opens.
  • the preliminary sintering temperature T1 may be lower than the solidus temperature T2a of the bonding material 6 (T1 ⁇ T2a).
  • pre-sintering is performed in a vacuum environment.
  • the preliminary sintering may be performed under a nitrogen atmosphere or an argon atmosphere.
  • the first presintered body 2A and the second presintered body 3A are respectively formed into the first sintered body 11 and the second sintered body. 12.
  • the first half of main sintering (at least the period during which the bonding material 6 melts and permeates into the gap 4) is performed in a vacuum environment, and the second half of main sintering is performed in an argon atmosphere.
  • the entire period of main sintering may be performed in a vacuum environment or an argon atmosphere.
  • the first Ni-based alloy and the second Ni-based alloy are Hastelloy X
  • the main sintering temperature T3 is lower than the solidus temperature of Hastelloy X
  • the Ni-based alloy easily evaporates.
  • the main sintering is performed in an argon atmosphere, such evaporation of the Ni-based alloy can be suppressed.
  • the composite sintered body 1 in which the first sintered body 11 and the second sintered body 12 are joined by the joining layer 13 can be obtained as shown in FIG.
  • the composite sintered body 1 may be subjected to HIP treatment and solution treatment at a temperature lower than the liquidus temperature T2 or the solidus temperature T2a of the bonding material 6. good.
  • the bonding layer 13 is formed by solidifying the bonding material 6 .
  • the solidification of the bonding material 6 is achieved by diffusion of specific components in the molten bonding material 6 into the first sintered body 11 and the second sintered body 12, or by the first sintered body 11 and the second sintered body 12. 12 is cooled.
  • FIG. 4 shows a cross section of the composite sintered body 1 obtained by the manufacturing method of this embodiment.
  • the bonding layer 13 is denser than the first sintered body 11 and the second sintered body 12, and has a thickness of 200 ⁇ m or more (the first unsintered body 2 and the second unsintered body Even if the gap 4 between the body 3 is 1 ⁇ m, it is due to melting of the bonding material 6 and diffusion of components).
  • the thickness of the bonding layer 13 is determined by the amount of the component (eg, Si) contained only in the bonding layer 13 when the component analysis is performed on the cross section of the composite sintered body 1 in the direction perpendicular to the bonding layer 13. This is the high concentration range.
  • the bonding layer 13 is formed between the first sintered body 11 and the second sintered body 12 by solidifying the molten bonding material 6. be done. Therefore, it is possible to obtain the composite sintered body 1 in which the sintered bodies 11 and 12 made of the Ni-based alloy are bonded together by the dense bonding layer 13 .
  • the bonding material 6 is a mixture of the second powder made of the first Ni-based alloy or the second Ni-based alloy and the first powder made of the third Ni-based alloy
  • the composition of the bonding layer 13 is set to the first powder.
  • the composition can be made close to that of the sintered body 11 or the second sintered body 12 .
  • the first unsintered body 2 and the second unsintered body 3 are arranged with the bonding material 6 placed in the space 5 facing the first unsintered body 2 and the second unsintered body 3 .
  • 3 was heated to form the first pre-sintered body 2A and the second pre-sintered body 3A.
  • the second unsintered body 3 is produced, it is heated alone to form a second presintered body 3A, and then a space 5 facing the first presintered body 2A and the second presintered body 3A.
  • the first presintered body 2A and the second presintered body 3A may be heated by placing the bonding material 6 on the first presintered body 2A.
  • the first temporary sintered body 2A and the second temporary sintered body 3A can be prepared at the same time, and preliminary sintering, bonding material melting, and final sintering can be performed. Can be done continuously.
  • first unsintered body 2 and the second unsintered body 3 are opposed to each other with the gap 4 therebetween, and the first unsintered body 2 and the second unsintered body 3 face each other.
  • the bonding material 6 is placed in the space 5 where the gap 4 opens, but the bonding material 6 is sandwiched between the first unsintered body 2 and the second unsintered body 3.
  • the first unsintered body 2 and the second unsintered body 3 may be heated in this state.
  • the first unsintered body 2 and the second unsintered body 3 are heated to form a first presintered body 2A and a second presintered body 3A, respectively, whereby the first presintered body 2A and the second presintered body 3A are heated.
  • the two temporary sintered bodies 2B face each other with the bonding material 6 interposed therebetween. After that, the first presintered body 2A and the second presintered body 2B are heated, so that the first presintered body 2A and the second presintered body 3A become the first presintered bodies after the bonding material 6 is melted.
  • a sintered body 11 and a second sintered body 12 are obtained.
  • first unsintered body 2 is produced, it is heated alone to form the first calcined body 2A, and after the second unsintered body 3 is produced, it is heated alone to perform the second calcination.
  • first temporary sintered body 2A and the second temporary sintered body 3A are opposed to each other with the bonding material 6 interposed therebetween, and in that state, the first temporary sintered body 2A and the second temporary sintered body 3A.
  • the second temporary sintered body 3A may be heated.
  • a method of manufacturing a composite sintered body includes the steps of preparing a first pre-sintered body made of powder made of a first Ni-based alloy; A step of preparing a second temporary sintered body, a step of facing the first temporary sintered body and the second temporary sintered body with a predetermined gap, and the first temporary sintered body and the A step of placing a bonding material made of a Ni-based alloy having a lower liquidus temperature than the first Ni-based alloy and the second Ni-based alloy in the space facing the second pre-sintered body and having the gap open; After the bonding material is installed, the first temporary sintered body and the second temporary sintered body are heated to melt the bonding material and permeate the gap, and then the first temporary sintered body and a step of using the second presintered body as a first sintered body and a second sintered body, respectively.
  • a bonding layer is formed between the first sintered body and the second sintered body by solidifying the molten bonding material. Therefore, it is possible to obtain a composite sintered body in which sintered bodies made of a Ni-based alloy are bonded together by a dense bonding layer.
  • the powder of the first Ni-based alloy is formed into a predetermined shape to produce a first unsintered body
  • the powder of the second Ni-based alloy is formed into a predetermined shape to produce a second unsintered body.
  • the first unsintered body and the second unsintered body face each other across the gap, and the gap facing the first unsintered body and the second unsintered body is
  • the first unsintered body and the second unsintered body are heated at a temperature lower than the liquidus temperature of the bonding material while the bonding material is placed in the open space.
  • the sintered body and the second unsintered body may be the first presintered body and the second presintered body, respectively. According to this configuration, the first pre-sintered body and the second pre-sintered body can be prepared simultaneously, and pre-sintering, bonding material melting, and final sintering can be performed continuously.
  • a method for manufacturing a composite sintered body includes the steps of preparing a first presintered body made of powder of a first Ni-based alloy; a step of preparing a configured second presintered body; and setting the first presintered body and the second presintered body to a liquidus temperature higher than the first Ni-based alloy and the second Ni-based alloy.
  • a step of sandwiching a bonding material made of a low Ni-based alloy between the first temporary sintered body and the second temporary sintered body, and facing the first temporary sintered body and the second temporary A step of heating the sintered body to melt the bonding material, and then forming the first temporary sintered body and the second temporary sintered body into a first sintered body and a second sintered body, respectively.
  • a bonding layer is formed between the first sintered body and the second sintered body by solidifying the molten bonding material. Therefore, it is possible to obtain a composite sintered body in which sintered bodies made of a Ni-based alloy are bonded together by a dense bonding layer.
  • the powder made of the first Ni-based alloy is molded into a predetermined shape to produce the first unsintered body
  • the powder made of the second Ni-based alloy is molded into a predetermined shape.
  • the first unsintered body and the second unsintered body are opposed to each other with the bonding material sandwiched therebetween, and the state by heating the first unsintered body and the second unsintered body at a temperature lower than the liquidus temperature of the bonding material, thereby heating the first unsintered body and the second unsintered body, respectively. It is good also as a 1st temporary sintered compact and a 2nd temporary sintered compact.
  • the first pre-sintered body and the second pre-sintered body can be prepared at the same time, and the pre-sintering process and the main sintering process can be performed continuously.
  • the first unsintered body and the second unsintered body may be produced by metal powder injection molding.
  • the first Ni-based alloy and the second Ni-based alloy may have the same composition.
  • each of the first Ni-based alloy and the second Ni-based alloy has, in mass percentage, 18.0 to 25.0% Cr, 7.0 to 11.0% Mo, and 22.0% or less Fe , 4.5% or less of Nb+Ta, and 3.0% or less of Co.
  • the Ni-based alloy constituting the bonding material has, in mass percentage, 18.0 to 23.0% Cr, 1.5 to 6.5% Mo, 3.5 to 8.5% Si, It may contain 13.0% or less Fe, 2.5% or less Nb+Ta, and 1.0% or less Co.
  • the bonding material includes a first powder made of a third Ni-based alloy having a liquidus temperature lower than that of the first Ni-based alloy and the second Ni-based alloy, and a second powder made of the first Ni-based alloy or the second Ni-based alloy. It may be a mixture of powders. According to this configuration, the composition of the bonding layer can be made close to the composition of the first sintered body or the second sintered body.
  • the mixing ratio of the first powder and the second powder may be 40%:60% to 80%:20% in mass percentage.
  • the third Ni-based alloy may contain 16.0 to 22.0% Cr and 8.0 to 12.0% Si in mass percentage. According to this configuration, Si in the third Ni-based alloy causes the liquidus line of the bonding material, which is a mixture of the second powder made of the first Ni-based alloy or the second Ni-based alloy, and the first powder made of the third Ni-based alloy.
  • the temperature can be lower than the liquidus temperature of the first Ni-based alloy or the second Ni-based alloy.
  • the first sintered body made of the first Ni-based alloy and the second sintered body made of the second Ni-based alloy are composed of the first Ni-based alloy and the second Ni-based alloy.
  • a composite sintered body joined by a joint layer made of a Ni-based alloy having a composition different from that of the alloy, wherein the joint layer is denser than the first sintered body and the second sintered body, and the joint It is characterized in that the thickness of the layer is 200 ⁇ m or more.
  • the bonding material of the present invention contains 18.0 to 23.0% Cr, 1.5 to 6.5% Mo, 3.5 to 8.5% Si, and 13.0% mass percentage. It is characterized by being made of a Ni-based alloy containing Fe below, Nb+Ta of 2.5% or less, and Co of 1.0% or less.
  • the bonding material with the above composition is 18.0 to 25.0% Cr, 7.0 to 11.0% Mo, 22.0% or less Fe, 4.5% or less Nb + Ta, 3.0% It can be suitably used for joining sintered bodies made of Ni-based alloys containing Co as described below.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Composite Materials (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
PCT/JP2022/009780 2021-03-12 2022-03-07 複合焼結体およびその製造方法ならびに接合材 Ceased WO2022191142A1 (ja)

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EP22767098.1A EP4306237A4 (en) 2021-03-12 2022-03-07 COMPOSITE SINTERED BODY, ITS MANUFACTURING METHOD AND BONDING MATERIAL

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