Carbide coated composite silicon nitride cutting tools

Details Carbide coated composite silicon nitride cutting tools Carbide coated composite silicon nitride cutting tools

1982-05-20

1983-11-22

Czaja, Donald E.

Abrasive tool making process, material, or composition

Impregnating or coating an abrasive tool

51308, 51309, 428404, 428698, B24D 1100

Patent

active

044166702

ABSTRACT:
Cutting tools and cutting tool inserts having improved mechanical and chemical wear resistance under demanding conditions of machining speed, temperature, or workpiece hardness comprise a composite silicon nitride substrate having at least one hard adherent coating layer of a refractory metal carbide. The composite silicon nitride substrate body consists essentially of particles of a refractory material uniformly distributed in a matrix consisting essentially of a first phase of silicon nitride and a refractory second phase comprising silicon nitride and an effective amount of a densification aid selected from the group consisting of yttrium oxide, hafnium oxide, the lanthanide rare earth oxides, and mixtures thereof.

REFERENCES:
patent: 3868235 (1975-02-01), Held
patent: 3953221 (1976-04-01), Lange
patent: 4169913 (1979-10-01), Kobayashi et al.
patent: 4179301 (1979-12-01), Buljan
patent: 4234661 (1980-11-01), Lee et al.
patent: 4264548 (1981-04-01), Ezis
patent: 4304576 (1981-12-01), Hattori et al.
patent: 4332909 (1982-06-01), Nishida et al.

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