Metal treatment – Process of modifying or maintaining internal physical... – Processes of coating utilizing a reactive composition which...
Patent
1987-10-21
1989-08-15
Childs, Sadie
Metal treatment
Process of modifying or maintaining internal physical...
Processes of coating utilizing a reactive composition which...
148281, 148282, 4273764, 4273765, 4273768, C23C 1100, C23C 1110
Patent
active
048571164
ABSTRACT:
Protective 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 M.sub.1 and M.sub.2, M.sub.1 being zirconium and/or titanium, which forms a stable nitride, carbide, boride or silicide under the prevailing conditions. The metal M.sub.2 does not form a stable nitride, carbide, boride or silicide. M.sub.2 serves to bond the carbide, etc. of M.sub.1 to the substrate metal. Mixtures of M.sub.1 and/or M.sub.2 metals may be employed. This method is much easier to carry out than prior methods and forms superior coatings. Eutectic alloys of M.sub.1 and M.sub.2 which melt substantially lower than the melting point of the substrate metal are preferred.
REFERENCES:
patent: 4229234 (1980-10-01), Krutenat et al.
patent: 4459328 (1984-07-01), Mizuhara
Allam Ibrahim M.
Rowcliffe David J.
Chen John Y.
Childs Sadie
Faubion Urban H.
Gregg Edward B.
S R I International
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