Appeal 2007-1852
Application 10/936,925
corrosion, oxidation, thermal fatigue, foreign particle impact, and other
hazards. (Specification [0001]). The method utilizes a cold gas-dynamic
spray technique to coat high pressure turbine (HPT) component surfaces
with mixtures of MCrAlY alloys and abrasive materials. (Specification
[0012]). Independent claim 10 is illustrative of the invention:
10. A method for coating a surface of a turbine component with an
environment-resistant and wear-resistant material, comprising the step of:
forming an abrasive coating by cold gas-dynamic spraying a powder
material on the turbine component surface, the powder materia1 comprising
a mixture of:
MCrAlY powder, with M being selected from Ni, Co and mixtures
thereof, and
an abrasive powder being selected from the group consisting of
carbides, and oxides; and
heat treating the turbine component at a temperature sufficiently high
to consolidate and homogenize the abrasive coating after the cold gas-
dynamic spraying.
The Examiner relies on the following prior art references to show
unpatentability:
Matarese US 4,744,725 May 17, 1988
Benoit US 5,551,840 Sep. 3, 1996
Howard US 2002/0197155 Dec. 26, 2002
Seth US 2003/0126800 Jul. 10, 2003
The Examiner made the following rejections:
1. Claims 10-13, 15, 16, and 18 under 35 U.S.C § 103(a) as
unpatentable over Seth in view of Howard and Benoit.
2
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