Method of preparing coated cemented carbide product

Details Method of preparing coated cemented carbide product Method of preparing coated cemented carbide product

1981-06-29

1983-08-16

Childs, Sadie L.

Coating processes

Coating by vapor, gas, or smoke

Plural coatings applied by vapor, gas, or smoke

148 315, 4272481, 427249, 427252, 427255, 4272552, 427343, 427377, 4274191, 4274192, 4274197, 428698, 428701, 428702, C23C 1100, C23C 1300

Patent

active

043991688

ABSTRACT:
An improved process for the production of coated cemented carbide products is disclosed. A cemented carbide substrate is treated to form a metal carbide, nitride or carbonitride coating. The coated substrate is heat treated at a temperature close to or near the melting point of the binder metal of the cemented carbide to diffuse elements from the substrate into the coating. An intermediate (second) metal carbide, nitride or carbonitride coating is thereafter applied and the portion of the second is oxidized, nitrided or sulfided without detrimentally affecting the adherence of the second coating. Thereafter, a wear-resistant oxide (e.g., aluminum oxide) coating is applied to form the improved coated carbide product.

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