Appeal No. 2002-0669 4
Application No. 09/527,270
plasma spraying an MCrAlY bond coat on the surface of the component to
have a surface roughness of 300 µinch to 800 µinch Ra and a surface area ratio of
at least 1.4;
forming an inward diffusion aluminide layer in the surface of the bond coat
using a vapor phase deposition process performed in a coating container and having
process parameters that include a process temperature of about 1010oC and a
duration of about six hours, the vapor phase deposition process using Co2Al5 as an
aluminum donor and aluminum fluoride as an activator at a concentration of about
1.8 grams of activator per liter of coating container volume, the inward diffusion
aluminide layer causing the surface of the bond coat to have an aluminum
concentration of at least 30 weight percent and a nickel concentration of less than
50 weight percent while maintaining a surface roughness of at least 300 µinch to
800 µinch Ra and a surface area ratio of at least 1.4; and
air plasma spraying a ceramic layer on the bond coat.
THE REJECTION
Claims 8 through 15 stand rejected under 35 U. S. C. § 112, first paragraph, as
containing subject matter which was not described in the specification in such a way as to
reasonably convey to one skilled in the relevant art that the inventors, at the time the
application was filed, had possession of the claimed invention.
OPINION
We have carefully considered all of the arguments advanced by the appellants and
the examiner, and agree with the appellants for the reasons set forth in the Brief and Reply
Brief and those below that the rejection of the claims under Section 112, first paragraph is
not well founded. Accordingly, we do not sustain this rejection.
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