Coating processes – With post-treatment of coating or coating material – Heating or drying
Patent
1997-10-15
2000-09-26
King, Roy V.
Coating processes
With post-treatment of coating or coating material
Heating or drying
427343, 427528, 427531, 427250, 4272554, 4272557, 4274193, 427405, B05D 302, C23C 1400
Patent
active
061239976
ABSTRACT:
A thermal barrier coating system and a method for forming the coating system which yields a thermal barrier coating having good adhesion to a bond coat overlying a metal superalloy substrate. The adhesion of the bond coat and the thermal barrier coating is enhanced by forming a mature .alpha.-alumina (Al.sub.2 O.sub.3) scale at the bond coat-TBC interface. The desired mature .alpha.-alumina scale can be obtained by utilizing one or more of the following steps: preoxidation of the bond coat at certain minimum temperatures and durations; inoculation of the surface of the bond coat; surface doping or alloying of the bond coat surface; and the addition of noble metals to the bond coat. Each of these steps promotes the formation of .alpha.-alumina and avoids the formation of the .gamma., .delta. and .theta.-alumina phases which undergo phase transformations at elevated temperatures, with the result that a more spallation-resistant thermal barrier coating system is obtained.
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Connor William B.
Field Robert D.
Schaeffer Jon C.
General Electric Company
Hess Andrew C.
King Roy V.
Narciso David L.
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