Process for adhering an oxide coating on a cobalt- enriched...

Details Process for adhering an oxide coating on a cobalt- enriched... Process for adhering an oxide coating on a cobalt- enriched...

C - Chemistry, Metallurgy

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C04B 35/64 (2006.01) B23B 27/14 (2006.01) C04B 41/52 (2006.01) C04B 41/89 (2006.01) C22C 1/05 (2006.01) C22C 29/02 (2006.01) C22C 29/08 (2006.01) C23C 16/02 (2006.01) C23C 16/40 (2006.01) C23C 30/00 (2006.01)

Patent

CA 1278173

IMPROVED PROCESS FOR ADHERING AN OXIDE COATING ON A COBALT-ENRICHED ZONE, AND ARTICLES MADE FROM SAID PROCESS ABSTRACT OF THE DISCLOSURE An improved fabrication process for cobalt-enriched cemented carbide substrates is disclosed, in which an article is generally comprised of tungsten carbide, cobalt, and carbides, nitrides or carbonitrides of titanium, tantalum, and niobium, or mixtures thereof. In one aspect of the invention the article is contacted with nitrogen gas and then sintered in the absence of nitrogen gas to form a cobalt-enriched, B-1 phase-depleted zone. The article is then sintered in nitrogen gas to form a B-1 phase enriched layer on the surface of the article. Additionally, a metal oxide wear layer can be provided on the article.

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