Coating processes – Coating by vapor – gas – or smoke – Metal coating
Patent
1990-03-02
1991-11-12
Beck, Shrive
Coating processes
Coating by vapor, gas, or smoke
Metal coating
427250, 427253, 4272551, 4272552, 4272554, 148279, C23C 806, C23C 828, C23C 1630, C23C 1646
Patent
active
050646915
ABSTRACT:
The surface properties of iron or ferrous alloy are improved by borosiliconizing the surface by contact with a stream of reducing gas containing hydrogen, optionally with an inert gas, to which a gaseous halide or hydride of boron and silicon have been added, either together or sequentially. The temperature of treatment is elevated, e.g. above 350.degree. C., but below 1200.degree. C. Diffusion coatings of both boron and silicon are formed in the ferrous surface. Typical surces of boron and silicon inlude boron trichloride, diborane and silane.
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Armor John N.
Cabrera Alejandro L.
Kirner John F.
Air Products and Chemicals Inc.
Beck Shrive
Burke Margaret
Marsh William F.
Rodgers Mark L.
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