Process for applying hard coatings and the like to metals...

Details Process for applying hard coatings and the like to metals... Process for applying hard coatings and the like to metals...

C - Chemistry, Metallurgy

23

C

148/24, 117/103.

C23C 20/08 (2006.01)

Patent

CA 1245111

ABSTRACT OF DISCLOSURE Hard coatings are applied to substrate metals by coating the metal surface, e.g. by dipping the substrate metal in a molten alloy of the coating metals, and then exposing the coating at an elevated temperature to an atmosphere containing a reactive gaseous species which forms a nitride, a carbide, a boride or a silicide. The coating material is a mixture of the metals M1 and M2 of which M1 forms a stable nitride, carbide, boride or silicide under the prevailing conditions and of which M2 does not form a stable nitride, carbide, boride or silicide. M2 serves to bond the nitride, etc. of M1 to the substrate metal. Mixtures of M1 and/or M2 metals may be employed. This method is much easier to carry out than prior methods.

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