Surface-coated sintered hard body

Details Surface-coated sintered hard body Surface-coated sintered hard body

1978-09-08

1980-12-16

Hunt, Brooks H.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75203, 75204, 75202, 75208R, 75244, 428548, 428565, 428379, 428380, 428384, C22C 105, C22C 2900

Patent

active

042395364

ABSTRACT:
This invention relates to a surface-coated sintered hard body comprising an alloy consisting of at least one of carbides and carbonitrides of Group IVa, Va and VIa transition metals, cemented by at least one of metals and alloys, and two interior and exterior coated layers, the interior layer being a monolayer or multilayer consisting of at least one of carbides, carbonitrides and nitrides of Group IVa, Va and VIa transition metals, in which a part of the non-metallic element or elements are optionally replaced by oxygen, and at least one layer of the interior layer consisting of at least one of carbides, carbonitrides and nitrides of Group IVa, Va and VIa transition metals, in which a part or all of the non-metallic element or elements are replaced by boron, and the exterior layer consisting of at least one of aluminum oxide, zirconium oxide and mixtures or compounds thereof.

REFERENCES:
patent: 3647576 (1972-03-01), Yamamura et al.
patent: 3999954 (1976-12-01), Kolaska et al.

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