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C - Chemistry, Metallurgy

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117/74.5

C23C 10/06 (2006.01) C23C 8/06 (2006.01) C23C 8/60 (2006.01) C23C 10/34 (2006.01) C23C 10/48 (2006.01)

Patent

CA 1072829

ABSTRACT OF THE DISCLOSURE 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, whilst 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.

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