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EP0259192A2
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A high toughness cermet and a process for the production of the same
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1987-09-04
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Granted: —
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Expires: 2007-09-04
Abstract
Abstract A cermet useful for cutting tools comprises a hard dispersed phase predominantly comprising a mixed carbonitride or titanium and at least one other element selected from the group consisting of Group IVa, Va and VIa elements of the Periodic Table and a binder metal phase comprising nickel and/or cobalt. The hard dispersed phase is before sintering subjected to a solid solution forming treatment at a temperature of at least the sintering temperature.
Inventors
- 👤 Masaaki c/o Sumitomo Electric Ind.Ltd. Tobioka
- 👤 Yasuhiro c/o Sumitomo Electric Ind.Ltd. Shimizu
- 👤 Kazutaka c/o Sumitomo Electric Ind.Ltd. Isobe
- 👤 Nobuyuki c/o Sumitomo Electric Ind.Ltd. Kitagawa
- 👤 Toshio Sumitomo Electric Ind.Ltd. Nomura
- 👤 Kunihiro c/o Sumitomo Electric Ind.Ltd. Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 00:43
CPC Classifications
C; C22; C22C; C22C29/00; C22C29/02; C22C29/04; B; B22; B22F; B22F1/00; B22F1/09; B22F1/14; B22F1/142; B22F1/148; B22F3/00; B22F3/10; C22C1/00; C22C1/04; C22C1/05; C22C1/051
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
84 words
A high toughness cermet comprising: a hard phase predominantly comprising a mixed carbonitride of titanium and at least one element selected from the group consisting of Group IVa, Va and VIa elements, other than titanium, of the Periodic Table; a binder phase predominantly comprising at least one metal selected from the group consisting of Ni and Co; and unavoidable impurities, the hard phase having previously been subjected to a solid solution forming treatment at a temperature of at least the sintering temperature before sintering.
Claim 2
Dependent Claim
84 words
A high toughness cermet comprising: a hard phase predominantly comprising a mixed carbonitride of titanium and at least one element selected from the group consisting of Group IVa, Va and VIa elements, other than titanium, of the Periodic Table; a binder phase predominantly comprising at least one metal selected from the group consisting of Ni and Co; and unavoidable impurities, the hard phase having previously been subjected to a solid solution forming treatment at a temperature of at least the sintering temperature before sintering.
Claim 3
Dependent Claim
13 words
A cermet according to claim 1 and containing no substantial proportion of molybdenum.
Claim 4
Dependent Claim
17 words
A cermet according to claim 1, wherein molybdenum constitutes 0 to 1% by weight of the cermet.
Claim 5
Dependent Claim
31 words
A cermet as claimed in any of claims 1 to 3, wherein at least one element selected from the group consisting of Ti and W is dissolved in the binder phase.
Claim 6
Dependent Claim
31 words
A cermet according to any of claims 1 to 4, wherein the atomic ratio of nitrogen and carbon contained in the cermet, N/(C+N), is in the range of 0.3 to 0.6.
Claim 7
Dependent Claim
22 words
A cermet according to any foregoing claim wherein the mixed carbonitride of the hard phase contains Ti and W as essential components.
Claim 8
Dependent Claim
28 words
A cermet according to any foregoing claim wherein the binder phase consists of Ni and Co in a Ni/(Ni + Co) ratio by weight of 0.3 to 0.8.
Claim 9
Dependent Claim
45 words
A cermet according to claim 7 wherein C is equal to or greater than 0.73 x[(20.2 x A) + (6.8 x B)] wherein A is weight % of Co, B is weight % of Ni and C is saturated magnetism in gauss cm³ per gram.
Claim 10
Dependent Claim
96 words
A cermet according to claim 1, wherein the carbonitride of the hard phase is represented by the general formula, (Ti x M y W z )(C A N B ) m in which, in terms of atomic ratios, x + y + z = 1, A + B = 1, 0.5 ≦ x ≦ 0.95, 0.01 ≦ y ≦ 0.4, 0.01 ≦ z ≦ 0.4, 0.1 ≦ A ≦ 0.9, 0.1 ≦ B + 0.9, 0.85 ≦ m ≦ 1.05 and M is at least one element selected from the group consisting of Ta and Nb.
Claim 11
Dependent Claim
21 words
A cermet according to claim 9, wherein A and B satisfy the relationship of 0.3 = B/(A + B) = 0.6.
Claim 12
Dependent Claim
38 words
A cermet according to claim 9, wherein the hard phase is bonded with 3 to 40% by weight of a binder phase consisting essentially of at least one element selected from the group consisting of Ni and Co.
Claim 13
Dependent Claim
129 words
A process for the production of a high toughness cermet which comprises mixing at least one member selected from the group consisting of nitrides, carbides, carbonitrides or titanium and mixtures thereof with at least one member selected from the group consisting of nitrides, carbides, carbonitrides of at least one transition metal selected from the group consisting of Group IVa, Va and VIa metals of Periodic Table except titanium and mixtures thereof, heating the mixed powders in a nitrogen atmosphere at a temperature of at least the sintering temperature to form a solid solution, pulverizing the solid solution to obtain a carbonitride powder, mixing the carbonitride powder with at least one metal selected from the group consisting of Ni and Co and then sintering the mixture in a nitrogen atmosphere.
Claim 14
Dependent Claim
129 words
A process for the production of a high toughness cermet which comprises mixing at least one member selected from the group consisting of nitrides, carbides, carbonitrides or titanium and mixtures thereof with at least one member selected from the group consisting of nitrides, carbides, carbonitrides of at least one transition metal selected from the group consisting of Group IVa, Va and VIa metals of Periodic Table except titanium and mixtures thereof, heating the mixed powders in a nitrogen atmosphere at a temperature of at least the sintering temperature to form a solid solution, pulverizing the solid solution to obtain a carbonitride powder, mixing the carbonitride powder with at least one metal selected from the group consisting of Ni and Co and then sintering the mixture in a nitrogen atmosphere.
Claim 15
Dependent Claim
33 words
A process according to claim 12, wherein the mixing and heating are carried out in such a manner that the solid solution has an N/(C + N) atomic ratio of 0.3 to 0.6.
Claim 16
Dependent Claim
20 words
A process according to claim 12, wherein the mixed powders further contain 0.01 to 2% by weight of carbon powder.
Claim 17
Dependent Claim
27 words
A process according to claim 12, wherein the carbonitride powder is mixed with Ni and Co in a Ni/(Ni + Co) weight ratio of 0.3 to 0.8.
References Cited (Backward Citations)
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