Appeal 2007-1852
Application 10/936,925
combinations of Ni and Co. Exemplary abrasive materials include
diamond, cubic boron nitride (CBN), and various carbides and
oxides. (Specification [0016]).
3) Seth discloses that it is known in the art to electrodeposit a
coating of hard particles embedded within a matrix on the surface
of certain gas turbine engine components. (Seth [0006]).
4) Seth discloses that known metallic bond coat materials
include MCrAlY and MCrAlRe, where M may be nickel, cobalt or
iron or a mixture thereof. (Seth [0004]).
5) According to Seth, a drawback of the electrodeposition
process, as well as other similar processes employing solutions
such as electroplating or electroless plating, is lack of precise
control in the placement of abrasive particles on the blade tips.
(Seth [0007]).
6) Seth is directed to overcoming the drawbacks of the prior
art by means of a cold spray process which co-deposits hard
particles with a matrix material on the substrate. According to
Seth, the co-deposition of the matrix material and hard particles
may be effected by directing relative quantities of their constituent
particles toward the substrate surface at a velocity sufficiently
high to cause at least some of the matrix material particles to
deform and to bond to the substrate surface while entrapping at
least a portion of the hard particles within the matrix material to
form a matrix composition on the substrate. The matrix
composition forms an abrasive coating on the substrate. (Seth
[0012]).
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