Appeal No. 2002-0190
Application No. 09/149,018
17. 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;
the method further including the step of
desulfurizing the article after at least one of the
steps of depositing the first layer and depositing the second
layer, by the steps of
heating the article to elevated temperature, and
thereafter
removing a thickness of from about 0.5 micrometers to
about 2 micrometers of material from a surface of the article
which was exposed during the step of heating.
THE REFERENCES
Rickerby et al. (Rickerby) 5,667,663 Sep. 16, 1997
McMordie et al. (McMordie) 5,922,409 Jul. 13, 1999
(effective filing date Feb. 28, 1994)
THE REJECTIONS
The claims stand rejected under 35 U.S.C. § 103 as follows:
claims 1-5, 9, 11, 12, 17, 19 and 20 over McMordie, and claims
6-8, 10, 17 and 18 over McMordie in view of Rickerby and the
appellants’ admitted prior art.1
1 The appellants’ admitted prior art relied upon by the examiner is the disclosure that it
was known in the art to apply a ceramic thermal barrier coating over a platinum-aluminide
3
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