Coated cemented carbide product

Details Coated cemented carbide product Coated cemented carbide product

1975-05-15

1976-06-29

Kendall, Ralph S.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

427255, 291827, 428469, C23C 1108

Patent

active

039670350

ABSTRACT:
A high-strength, coated cemented carbide product comprising a cemented carbide substrate and a fully dense alpha aluminum oxide coating on the substrate. The coating has a thickness of from 1-20 microns and is firmly and adherently bonded to the cemented carbide substrate through a thin intermediate nonometallic layer of an iron group metal aluminate. The coated product combines a wear resistance substantially as high as aluminum oxide coating materials and a transverse rupture strength of at least 150,000 psi. The coated product is prepared by passing water vapor, hydrogen gas and an aluminum halide over the substrate at a temperatue of from 900.degree.-1250.degree.C. the ratio of water vapor to hydrogen gas being between about 0.025 and 2.0.

REFERENCES:
patent: 3736107 (1973-05-01), Hale
patent: 3914473 (1975-10-01), Hale

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