ATBECHDEDKESFRGBGRITLILUNLSEMCPTIESILTLVFIROMKCYALTRBGCZEEHUPLSKBAHRIS..MT..RS......................JDIM360 Ver 2.15 (14 Jul 2008) - 1620000/01908857EUROPEAN PATENT APPLICATIONA320091014EP07117636.620071001enenen54360920061005US2009101420094220080409200815C23C 4/08 20060101AFI20080201BHEP C23C 4/18 20060101ALI20080201BHEP C23C 30/00 20060101ALI20080201BHEP deVerfahren zur Bildung einer WärmedämmschichtenMethod for forming a thermal barrier coatingfrProcédé de formation d'un revêtement de barrière thermique2GENERAL ELECTRIC COMPANY00203903187554/126931 River RoadSchenectady, NY 12345USDAROLIA, Ramgopal 7377 Overland Park CourtWest Chester, OH 45069USHAZEL, Brian Thomas 6450 Coyote CourtWest Chester, OH 45069USSzary, Anne Catherine00076781London Patent Operation GE International Inc. 15 John Adam StreetLondon WC2N 6LUGBATBEBGCHCYCZDEDKEEESFIFRGBGRHUIEISITLILTLULVMCMTNLPLPTROSESISKTRALBAHRMKRS20091014200942

Method including providing a nickel aluminide intermetallic overlay coating (24) on a superalloy substrate (22) and growing a controlled aluminum oxide on the overlay coating. The overlay coating is pre-oxidized to promote the growth of predominantly alpha phase alumina scale (28). The pre-oxidizing conditions may include heating the coated substrate to 1121 °C for two to eight hours under vacuum. The pre-oxidized overlay coating may be used as an environmental coating or as a bond coat for a thermally insulating ceramic barrier coating (26).