Appeal No. 1998-2295
Application No. 08/435,902
a coating directly in contact with the substrate, the coating being formed of a mixture
of a ceramic and a second metal, the second metal being selected from the group consisting
of a nickel-base alloy and a cobalt-base alloy, wherein the substrate has a substrate
coefficient of thermal expansion, and the mixture has a mixture coefficient of thermal
expansion, and wherein the relative amounts of the ceramic and the second metal in the
mixture are such that the coefficient of thermal expansion of the mixture is about the same
as the substrate coefficient of thermal expansion over at least some temperature range.
12. A method for preparing an article, comprising the steps of:
providing a substrate made of a first metal comprising a titanium-base alloy; and
applying a coating directly in contact with a surface of the substrate, the coating being
formed of a mixture of a second metal and a ceramic, wherein the step of applying includes
the steps of
determining the thermal expansion coefficient of the substrate, and
selecting a coating proportion of the second metal and the ceramic such that the
thermal expansion coefficient of the coating has a selected relation to the thermal expansion
coefficient of the substrate.
CITED PRIOR ART
As evidence of unpatentability, the Examiner relies on the following references:
Hodshire et al. (Hodshire) 3,785,785 Jan. 15, 1974
Wolfla 3,864,093 Feb. 04, 1975
Wilbers et al. (Wilbers) 4,250,610 Feb. 17, 1981
Blackburn et al. (Blackburn) 4,292,077 Sep. 29, 1981
Quets 5,223,332 Jun. 29, 1993
The Examiner rejected claims 9, 10, 12, 13 and 15 to 20 as unpatentable under 35
U.S.C. § 103(a) as obvious over the combination of Quets and Wilbers. Claim 11 is rejected
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