Coating articles having fine bores or narrow cavities in a pack-

Coating processes – Coating by vapor – gas – or smoke – Metal coating

Patent

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Details

118 49, 148 63, C23C 902

Patent

active

041560426

ABSTRACT:
A process for coating an article such as a turbine blade composed of nickel-base alloy, comprises the steps of surrounding the article by a particulate pack in a chamber, the pack including coating material in elemental or chemically combined form, said coating material selected from the group comprising aluminium, chromium, titanium, zirconium tantalum, niobium, yttrium, rare earth metals, boron and silicon together with a halide activator, preferably of low volatility, and cyclically varying the pressure of an inert gas or a reducing gas or a mixture of said gases contained within said chamber, while maintaining the contents of the chamber at a temperature sufficient to transfer coating material onto the surface of the article and form a diffusion coating thereon.

REFERENCES:
patent: 2210832 (1940-08-01), Bright
patent: 3079276 (1963-02-01), Puyear et al.
patent: 3158499 (1964-11-01), Jenkins
patent: 3257230 (1966-06-01), Wachtell
patent: 3343982 (1967-09-01), Maxwell et al.
patent: 3373018 (1968-03-01), Oxley et al.

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