Carbonitride coated composite silicon nitride cutting tools

Details Carbonitride coated composite silicon nitride cutting tools Carbonitride coated composite silicon nitride cutting tools

1982-05-20

1983-10-11

Czaja, Donald E.

Abrasive tool making process, material, or composition

Impregnating or coating an abrasive tool

51307, 51308, 51309, 427215, 428404, 428698, B24D 1100

Patent

active

044090048

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 carbonitride. 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.

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