Appeal 2007-0882
Application 10/702,987
7) White teaches that the HIP cycle is conducted “at a suitable
temperature, time and pressure cycle to prevent recrystallization while
effecting a diffusion bond at the crack surface.” Col. 5, ll. 37-39.
8) White discloses that “after hot isostatic pressing the part member
may still be in an unfinished form, and will, therefore, further require the
use of material removal and surface finishing steps such as machining,
polishing or other material removal to produce a finished part.” Col. 5,
ll. 55-60.
9) White discloses examples in which the coating is hot isostatic
pressed at 1150 ºC. Examples 1-3.
10) Bajan discloses “a method for applying metallurgical coatings to a
superalloy substrate, and more particularly, to a method for preparing the
surface of a gas turbine component and subsequently depositing a
metallurgical coating on the surface of the component.” Bajan [0002].
11) According to Bajan, it is known in the art to use protective
metallurgical coatings to increase the life of a gas turbine component.
Bajan [0004]. Bajan states that “gas turbine components include, for
example, blades, vanes, buckets, shrouds and similar components, which
form part of the hot section of the engine.” Bajan [0049].
12) According to Bajan, it is known in the art to use the HVOF process
to deposit a metallic layer over the substrate of an article that is used in a
gas turbine engine. “The metallic layer is formed from high temperature,
oxidation-resistant alloys including nickel-based superalloys.” Bajan
[0007].
13) Bajan teaches subjecting the coated substrate to Hot Isostatic
Pressing (HIP) ‘to densify and reduce the porosity of the HVOF coating,
5
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Last modified: September 9, 2013