(19)
(11) EP 1 908 857 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
14.10.2009 Bulletin 2009/42

(43) Date of publication A2:
09.04.2008 Bulletin 2008/15

(21) Application number: 07117636.6

(22) Date of filing: 01.10.2007
(51) International Patent Classification (IPC): 
C23C 4/08(2006.01)
C23C 30/00(2006.01)
 C23C 4/18(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK RS

(30) Priority: 05.10.2006 US 543609

(71) Applicant: GENERAL ELECTRIC COMPANY
Schenectady, NY 12345 (US)

(72) Inventors:
  • DAROLIA, Ramgopal
    West Chester, OH 45069 (US)
  • HAZEL, Brian Thomas
    West Chester, OH 45069 (US)

(74) Representative: Szary, Anne Catherine 
London Patent Operation GE International Inc. 15 John Adam Street
London WC2N 6LU
London WC2N 6LU (GB)

   


(54) Method for forming a thermal barrier coating


(57) 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).







Search report