Process for adhering an oxide coating on a cobalt-enriched zone,

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

1985-05-06

1987-03-10

Lechert, Jr., Stephen J.

Stock material or miscellaneous articles

All metal or with adjacent metals

Having metal particles

75236, 75238, 75240, 75242, 419 15, 419 16, 419 38, 419 53, 419 54, 419 57, 427314, 428565, 428652, 428698, 4289088, 428699, B22F 300

Patent

active

046490841

ABSTRACT:
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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