Appeal No. 2004-2027
Application No. 09/670,189
(Specification, page 2, lines 15-24.) According to the
appellants, “[t]he present invention provides a method for
coating an article with an aluminide coating that is modified
with at least one other element to enhance oxidation resistance
and other environmental performance of the coating. (Id. at
lines 15-17.) Further details of this appealed subject matter
are recited in representative claims 1 and 12, the only
independent claims on appeal, reproduced below:
1. A method for coating an article, comprising
the steps of:
providing the article having a surface;
preparing a coating source comprising:
a solid aluminum halide,
a solid fluoride or a solid iodide of a
modifying element as a source of the modifying
element, the modifying element being selected from
the group consisting of zirconium, hafnium, and
yttrium, and combinations thereof, and
a carrier gas;
producing a coating gas from the coating source,
the coating gas comprising a gaseous aluminum halide, a
gaseous fluoride or a gaseous iodide of the modifying
element, and the carrier gas; and
contacting the coating gas to the article; and
simultaneously
heating the coating gas and the article to a
coating temperature of at least about 1850ºF for a
period of time sufficient to permit aluminum and the
modifying element to coat onto the surface of the
article.
12. A method for coating an article, comprising
the steps of:
providing the article having a surface, the
article being an airfoil;
preparing a coating source comprising:
a solid aluminum halide,
a solid fluoride of a modifying element as a
2
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