| 摘要 |
PCT No. PCT/JP88/01082 Sec. 371 Date Jun. 23, 1989 Sec. 102(e) Date Jun. 23, 1989 PCT Filed Oct. 26, 1988 PCT Pub. No. WO89/03896 PCT Pub. Date May 5, 1989.Disclosed are a cermet alloy having excellent wear resistance and strength at elevated temperatures, and a composite mechanical part containing a strong layer of any such cermet alloy formed on the outer or inner surface of an alloy base. The materials which are used for making rolls, dies, punches, etc. are required to have excellent toughness, impact resistance, high-temperature strength and wear resistances. The conventional ultrahard WC-Co alloys are, however, unsatisfactory in high-temperature strength, through they have a satisfactorily high level of wear resistance. The conventional cermet alloys are low in toughness and impact strength, though they have high oxidation resistance. There has not been availabe any alloy that satisfies all of the requirements as herein-above stated. An energetic study has been made of the effects which the components of a cermet alloy may have on those requirements, and it has been found that all of those requirements can be satisfied by a cermet alloy which comprises a hard phase comprising 20 to 50% by weight of at least one of the carbides, nitrides and carbonitrides of Group IVa, VA and VIa elements and further containing at least one of the carbide, nitride and carbonitride of titanium, and a binding phase containing appropriate amounts of nickel and chromium. This cermet can be used to form a layer bonded to a surface of an alloy base to make a composite mechanical part.
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