EP0349740A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Complex boride cermets
Assignee: AGC Inc
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Filing: 1989-05-16
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Granted: —
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Expires: 2009-05-16
Abstract
Abstract A complex boride cermet comprising a hard phase composed mainly of Mo₂NiB₂ or (Mo 1-x W x )₂NiB₂ and a matrix of an alloy phase composed mainly of Ni and containing Mo, which is characterized in that carbon or/and nitrogen, and optionally at least one metal selected from the metals of Groups 4a and 5a and Cr, are incorporated to further improve the strength and toughness. Such complex boride cermet has high strength and high toughness and maintains such properties even at elevated temperatures of from 600 to 900°C. Also disclosed is a process for producing a complex boride cermet containing carbon or/and nitrogen, and optionally at least a carbide or/and a nitride of a metal selected from the metals of Groups 4a, 5a and 6a are added to the starting material.
Inventors
- 👤 Yasuo Shinozaki
- 👤 Noritoshi Horie
- 👤 Kazuo Hamashima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 10:58
CPC Classifications
C; C22; C22C; C22C29/00; C22C29/14
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
58 words
A complex boride cermet having high strength and high toughness, which comprises a hard phase composed mainly of a nickel-molybdenum complex boride or a nickel-molybdenum complex boride with a part of the molybdenum substituted by tungsten, and a matrix of an alloy phase composed mainly of nickel and containing molybdenum, and which contains carbon in its sintered body.
Claim 2
Dependent Claim
58 words
A complex boride cermet having high strength and high toughness, which comprises a hard phase composed mainly of a nickel-molybdenum complex boride or a nickel-molybdenum complex boride with a part of the molybdenum substituted by tungsten, and a matrix of an alloy phase composed mainly of nickel and containing molybdenum, and which contains carbon in its sintered body.
Claim 3
Dependent Claim
48 words
The complex boride cermet according to Claim 1, which contains from 5 to 60% by weight of the matrix alloy phase in the sintered body and which further contains at least one metal selected from the metals of Groups 4a and 5a of the Periodic Table and chromium.
Claim 4
Dependent Claim
21 words
The complex boride cermet according to Claim 2, which contains from 10 to 45% by weight of the matrix alloy phase.
Claim 5
Dependent Claim
49 words
The complex boride cermet according to Claim 2 or 3, wherein carbon contained in the sintered body is from 0.05 to 3.0% by weight, and the total content of the metals of Groups 4a and 5a of the Periodic Table and chromium is from 0.2 to 30% by weight.
Claim 6
Dependent Claim
53 words
The complex boride cermet according to Claim 2, 3 or 4, which contains one or both of tantalum and niobium in the sintered body, and wherein the total content of tantalum and niobium is from 0.5 to 32% by weight, and the content of the carbon is from 0.05 to 3.0% by weight.
Claim 7
Dependent Claim
95 words
A process for producing a complex boride cermet having high strength and high toughness, which comprises a hard phase composed mainly of a nickel molybdenum complex boride or a nickel-molybdenum complex boride with a part of the molybdenum susbstituted by tungsten, and a matrix of an alloy phase composed mainly of nickel and containing molybdenum, wherein a carbide or carbides of a metal selected from the metals of Groups 4a, 5a and 6a of the Periodic Table is added in an amount of from 0.25 to 35% by weight to the starting material for sintering.
Claim 8
Dependent Claim
95 words
A process for producing a complex boride cermet having high strength and high toughness, which comprises a hard phase composed mainly of a nickel molybdenum complex boride or a nickel-molybdenum complex boride with a part of the molybdenum susbstituted by tungsten, and a matrix of an alloy phase composed mainly of nickel and containing molybdenum, wherein a carbide or carbides of a metal selected from the metals of Groups 4a, 5a and 6a of the Periodic Table is added in an amount of from 0.25 to 35% by weight to the starting material for sintering.
Claim 9
Dependent Claim
58 words
A complex boride cermet having high strength and high toughness, which comprises a hard phase composed mainly of a nickel-molybdenum complex boride or a nickel-molybdenum complex boride with a part of the molybdenum substituted by tungsten, and a matrix of an alloy phase composed mainly of nickel and containing molybdenum, and which contains nitrogen in its sintered body.
Claim 10
Dependent Claim
58 words
A complex boride cermet having high strength and high toughness, which comprises a hard phase composed mainly of a nickel-molybdenum complex boride or a nickel-molybdenum complex boride with a part of the molybdenum substituted by tungsten, and a matrix of an alloy phase composed mainly of nickel and containing molybdenum, and which contains nitrogen in its sintered body.
Claim 11
Dependent Claim
48 words
The complex boride cermet according to Claim 7, which contains from 5 to 60% by weight of the matrix alloy phase in the sintered body and which further contains at least one metal selected from the metals of Groups 4a and 5a of the Periodic Table and chromium.
Claim 12
Dependent Claim
21 words
The complex boride cermet according to Claim 8, which contains from 10 to 45% by weight of the matrix alloy phase.
Claim 13
Dependent Claim
48 words
The complex boride cermet according to Claim 8 or 9, wherein nitrogen contained in the sintered body is from 0.02 to 2.0% by weight, and the total content of metals of Groups 4a and 5a of the Periodic Table and chromium is from 0.1 to 20% by weight.
Claim 14
Dependent Claim
35 words
The complex boride cermet according to Claim 8 or 9, which contains 0.1 to 20% by weight of tantalum of Group 5a and from 0.02 to 1.2% by weight of nitrogen in the sintered body.
Claim 15
Dependent Claim
94 words
A process for producing a complex boride cermet having high strength and high toughness, which comprises a hard phase composed mainly of a nickel-molybdenum complex boride or a nickel-molybdenum complex boride with a part of the molybdenum substituted by tungsten, and a matrix of an alloy phase composed mainly of nickel and containing molybdenum, wherein a nitride or nitrides of a metal selected from the metals of Groups 4a, 5a and 6a of the Periodic Table is added in an amount of from 0.12 to 22% by weight to the starting material for sintering.
Claim 16
Dependent Claim
94 words
A process for producing a complex boride cermet having high strength and high toughness, which comprises a hard phase composed mainly of a nickel-molybdenum complex boride or a nickel-molybdenum complex boride with a part of the molybdenum substituted by tungsten, and a matrix of an alloy phase composed mainly of nickel and containing molybdenum, wherein a nitride or nitrides of a metal selected from the metals of Groups 4a, 5a and 6a of the Periodic Table is added in an amount of from 0.12 to 22% by weight to the starting material for sintering.
Claim 17
Dependent Claim
60 words
A complex boride cermet having high strength and high toughness, which comprises a hard phase composed mainly of a nickel-molybdenum complex boride or a nickel-molybdenum complex boride with a part of the molybdenum substituted by tungsten, and a matrix of an alloy phase composed mainly of nickel and containing molybdenum, and which contains nitrogen and carbon in its sintered body.
Claim 18
Dependent Claim
60 words
A complex boride cermet having high strength and high toughness, which comprises a hard phase composed mainly of a nickel-molybdenum complex boride or a nickel-molybdenum complex boride with a part of the molybdenum substituted by tungsten, and a matrix of an alloy phase composed mainly of nickel and containing molybdenum, and which contains nitrogen and carbon in its sintered body.
Claim 19
Dependent Claim
48 words
The complex boride cermet according to Claim 13, which contains from 5 to 60% by weight of the matrix alloy phase in the sintered body and which further contains at least one metal selected from the metals of Groups 4a and 5a of the Periodic Table and chromium.
Claim 20
Dependent Claim
23 words
The complex boride cermet according to Claim 13 or 14, which contains from 10 to 45% by weight of the matrix alloy phase.
Claim 21
Dependent Claim
39 words
The complex boride cermet according to Claim 13, 14 or 15, wherein carbon contained in the sintered body is from 0.05 to 3% by weight, and nitrogen contained in the sintered body is from 0.02 to 2% by weight.
Claim 22
Dependent Claim
39 words
The complex boride cermet according to Claim 13, 14 or 15, wherein carbon contained in the sintered body is from 0.1 to 2% by weight, and nitrogen contained in the sintered body is from 0.05 to 1% by weight.
Claim 23
Dependent Claim
100 words
A process for producing a complex boride cermet having high strength and high toughness, which comprises a hard phase composed mainly of a nickel-molybdenum complex boride or a nickel-molybdenum complex boride with a part of the molybdenum substituted by tungsten, and a matrix of an alloy phase composed mainly of nickel and containing molybdenum, wherein a carbide or carbides and a nitride or nitrides of a metal selected from the metals of Groups 4a, 5a and 6a of the Periodic Table are added in a total amount of from 0.7 to 45% by weight to the starting material for sintering.
Claim 24
Dependent Claim
100 words
A process for producing a complex boride cermet having high strength and high toughness, which comprises a hard phase composed mainly of a nickel-molybdenum complex boride or a nickel-molybdenum complex boride with a part of the molybdenum substituted by tungsten, and a matrix of an alloy phase composed mainly of nickel and containing molybdenum, wherein a carbide or carbides and a nitride or nitrides of a metal selected from the metals of Groups 4a, 5a and 6a of the Periodic Table are added in a total amount of from 0.7 to 45% by weight to the starting material for sintering.
References Cited (Backward Citations)
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