C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
148/40
C23C 22/72 (2006.01) C23C 10/24 (2006.01)
Patent
CA 1191435
ABSTRACT OF THE DISCLOSURE A method is disclosed for forming a carbide layer on the surface of a carbon-containing ferrous alloy article or a cemented carbide article in a molten treating bath. The bath is prepared by introducing 5 to 20% by weight of alumina into molten boric acid or borate bath and a carbide-forming element dissolved therein. By employing the treating bath of this invention, the life of the bath can be remarkably improved, and no sintered substance of undissolved carbide-forming element is produced in the treating bath. Further, it is possible to reduce markedly the corrosion of the article and of the vessel holding the bath. The invention includes a treating material for forming a carbide layer on the surface of a carbon-containing ferrous alloy article or a cemented carbide article which is composed of boric acid or a borate, a carbide-forming element and from 5 to 20% by weight, based on the whole weight of the treating material, of alumina.
401191
Arai Tohru
Fujita Hironori
Takada Yasuo
Kabushiki Kaisha Toyota Chuo Kenkyusho
Smart & Biggar
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