Appeal No. 2002-0190
Application No. 09/149,018
THE INVENTION
The appellants’ claimed invention is directed toward a
method for making an article, such as an aircraft gas turbine
vane or blade, having a protective coating. Claims 1 and 17 are
illustrative:
1. A method for preparing an article having a substrate
protected by an overlying coating, comprising the steps of
furnishing a substrate comprising a nickel-base
superalloy; thereafter
depositing a first layer comprising platinum contacting
an upper surface of the substrate; thereafter
depositing a second layer comprising aluminum
contacting an upper surface of the first layer, leaving an
exposed surface; and thereafter
final desulfurizing the article by removing sulfur
initially in the substrate to yield
an article with a final-desulfurized exposed surface,
the step of final desulfurizing including the steps of
heating the article to a final desulfurizing elevated
temperature of from about 1800 F to about 1975 F in an atmosphere
of a reducing gas, and thereafter
removing a layer of sulfur-concentrated material from
the exposed surface of the article.
2
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