Alumina coated composite silicon nitride cutting tools

Details Alumina coated composite silicon nitride cutting tools Alumina coated composite silicon nitride cutting tools

1982-05-20

1983-12-20

Czaja, Donald E.

Abrasive tool making process, material, or composition

Impregnating or coating an abrasive tool

51308, 51309, 427214, 428404, B24D 1100

Patent

active

044215258

ABSTRACT:
Coated composite ceramic 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 of alumina. The composite silicon nitride substrate consists 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 yttrium oxide, zirconium oxide, hafnium oxide, the lanthanide rare earth oxides, and mixtures thereof.

REFERENCES:
patent: 3914473 (1975-10-01), Hale
patent: 4179301 (1979-12-01), Buljan
patent: 4249913 (1981-02-01), Johnson et al.

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