Appeal 2006-2179
Application 10/735,369
for topside deposition and infiltration in between the PVD
deposition gaps or cracks, or the APS deposited cracks or
pores….
Like with base layer 28, the overlay layer 32 can be a
single-oxide having the chemical formula denoted by CwOz,
where C is selected from the group consisting of: Al, Ca, Mg,
Zr, Y, Sc, La, Ce, Pr, Nd, P, Sm, Eu, Gd, Dy, Ho, E, T, Yb, Ta,
Nb [and] combinations thereof and the like….
Alternatively, the overlay layer 28 [sic., 32] can be a
mixture of two oxides having the chemical formula denoted by
Cw1Oz1 and Dw11Oz11 or more simply (C, D)wOz, where C and D
are selected from the group consisting of : Al, Ca, Mg, Zr, Y,
Sc, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, Ta,
Nb [and] combinations thereof and the like…
Of the materials specifically listed, Ta and Nb are from Group 5 of the
Periodic Table and Al, Ca, Mg, Y, Sc, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Dy,
Ho, Er, Tm, and Yb are from Group 2 or 3 of the Periodic Table. See the
Periodic Table. We observe that Subramanian further teaches at column 7,
lines 10-17, that:
The materials or compositions 28, 32 are advantageously
selected based on their phase stability and possible reaction
products. The reaction products 32’ that subsequently form
part of the TBC 20 are selected such that they are phase stable
to high temperatures, possess low thermal conductivity and
have a low tendency to sinter. In addition, the reaction product
32’ can be selected to provide improved corrosion and erosion
resistance.
Thus, we determine that the selection of the optimum amounts of the
elements specifically listed in Subramanian to arrive at the claimed
stabilization composition is well within the ambit of one of ordinary skill in
the art since Subramanian recognizes such selection to be a result effective
variable. In re Boesch, 617 F.2d 272, 276, 205 USPQ 215, 219 (CCPA
8
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