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EP0302635A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Cermet alloy

Assignee: Proterial Ltd
•
Filing: 1988-07-22
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Granted: —
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Expires: 2008-07-22
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Abstract

Abstract A cermet alloy of improved toughness, high-temperature strength and chipping resistance consists essentially of 50-95% by weight of a hard phase of a composite carbo-nitride of at least both of W and Ti and, optionally, one or more elements selected from the group consisting of Groups 4a, 5a and 6a elements of the periodic table, the balance being a binding phase, of an Fe family element or elements and inevitable impurities, said composite carbo-nitride has a rim-and-core structure which comprises a core portion of a composite carbo-nitride poor in Ti and nitrogen, surrounded thereon by a rim portion of a composite carbo-nitridge rich in Ti and nitrogen. It is preferred that the hard phase consists of 50% by volume or less of TiN or TiCN particles having N ≧ C and forming no rim-and-core structure and the composite carbo-nitride having the rim-and core-structure.

Inventors

  • 👤 Nobuhiko Shima
  • 👤 Hisaaki Ida
  • 👤 Yusuke Iyori

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 00:27
CPC Classifications
C; C22; C22C; C22C29/00; C22C29/02; C22C29/04; B; B22; B22F; B22F2998/00

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 93 words
A cermet alloy consisting essentially of 50-95% by weight of a hard phase of a composite carbo-nitride of at least both of tungsten and titanium and, optionally, one or more elements selected from Groups 4a, 5a and 6a elements of the periodic table, the balance being a binding phase of an iron family element or elements and inevitable impurities, the composite carbo-nitride having a rim-and-core structure comprising a core portion of a composite carbo-nitride poor in titanium and nitrogen, surrounded by a rim portion of a composite carbo-nitride rich in titanium and nitrogen.
Claim 2
Dependent Claim 93 words
A cermet alloy consisting essentially of 50-95% by weight of a hard phase of a composite carbo-nitride of at least both of tungsten and titanium and, optionally, one or more elements selected from Groups 4a, 5a and 6a elements of the periodic table, the balance being a binding phase of an iron family element or elements and inevitable impurities, the composite carbo-nitride having a rim-and-core structure comprising a core portion of a composite carbo-nitride poor in titanium and nitrogen, surrounded by a rim portion of a composite carbo-nitride rich in titanium and nitrogen.
Claim 3
Dependent Claim 42 words
An alloy according to claim 1, wherein said hard phase consists of (a) 50% or less by volume of TiN or TiCN particles having N ≧ C and forming no rim-and-core structure and (b) the composite carbo-nitride having the rim-and core structure.
Claim 4
Dependent Claim 55 words
A method for producing a cermet alloy according to claim 1 or 2, which comprises mixing TiN or TiCN and a metal for the binding phase with a carbo-nitride of tungsten and titanium and optionally one or more elements selected from Groups 4a, 5a and 6a of the periodic table, and then sintering the mixture.

References Cited (Backward Citations)

US4150984A Cited
DE3100926A1 Cited
DE3418403A1 Cited

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