Stock material or miscellaneous articles – Composite – Of metal
Patent
1989-07-18
1990-07-24
Herbert, Thomas J.
Stock material or miscellaneous articles
Composite
Of metal
428698, 428704, B32B 1504
Patent
active
049434853
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 stale 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: 3622234 (1971-11-01), Seybolt
patent: 4229234 (1980-10-01), Krutenat et al.
patent: 4342792 (1982-08-01), Brown et al.
Allam Ibrahim M.
Rowcliffe David J.
Chen John Y.
Faubion Urban H.
Gregg Edward B.
Herbert Thomas J.
S R I International
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