Appeal 2007-0687
Application 10/797,422
1 Further, according to the Appellants’ specification, the terms
2 “alumina” and “aluminum oxide” refer interchangeably to those compounds
3 and compositions comprising Al2O3. Specification, p. 5, ll. 27-29.
4 The Appellants disclose that the term “alumina precursor” refers to
5 those aluminum compounds that are capable of being converted to alumina.
6 Suitable alumina precursors include alumina sols and aluminum alkoxides.
7 Specification, p. 12, ll. 3-8.
8 Hasz discloses a method for protecting thermal barrier coatings from
9 degradation caused by environmental contaminants. Hasz, col. 1, ll. 9-11.
10 Environmental contaminants include contaminants from fuel and air
11 sources. Hasz, col. 2, ll. 64-67.
12 More specifically, the invention disclosed in Hasz relates to the use of
13 an impermeable coating on a thermal barrier coating, where the impermeable
14 coating reduces infiltration of liquid contaminant compositions into the
15 thermal barrier coating. Hasz, col. 1, ll. 11-15.
16 According to Hasz, thermal barrier coatings are deposited onto gas
17 turbine and other heat engine parts to reduce heat flow and to limit the
18 operating temperature of metal parts. These coatings are generally a ceramic
19 material, such as yttria-stabilized zirconia ceramic coating. Hasz, col. 1, ll.
20 19-27.
21 Hasz discloses that the ideal system for a hot high temperature engine
22 part consists of a thermal barrier ceramic layer deposited onto a bond coat
23 which exhibits good corrosion resistance and closely matched thermal
24 expansion coefficients. Hasz, col. 1, ll. 41-45.
4
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