C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 4/10 (2006.01) C23C 4/12 (2006.01) C23C 28/00 (2006.01) C23C 30/00 (2006.01) F01D 5/28 (2006.01) F01D 25/00 (2006.01)
Patent
CA 2747329
A composition useful as a thermal barrier coating on a su-peralloy substrate intended for use in hostile thermal environments. The coating comprises zirconia stabilized in a predominately tetragonal phase. The composition includes a ceramic component consisting essentially of zirconia (ZrO2) or a combination of zirconia and hafnia (HfO2) and a stabilizer component comprising, in combination, a first co-stabilizer selected from YbO1.5, HoO1.5, ErO1.5, TmO1.5, LuO1.5, and combinations thereof, and a second co-stabilizer selected from TiO2, PdO2, VO2, GeO2, and combinations thereof. Optionally, the stabilizer component includes Y2O3. The stabilizer component is present in an amount effective to achieve the predominantly tetragonal phase in the coating.
La présente invention concerne une composition utile en tant que revêtement de barrière thermique sur un substrat en superalliage, utilisable dans des environnements thermiques hostiles. Le revêtement comporte de la zircone stabilisée dans une phase majoritairement tétragonale. La composition comporte un constituant céramique composé essentiellement de zircone (ZrO2) ou une combinaison de zircone et d'oxyde d'hafnium (HfO2) et un constituant stabilisateur, comportant, en combinaison, un premier co-stabilisant choisi parmi YbOl,5, HoOl,5, ErOl,5, TmOl,5, LuOl,5, et des combinaisons de ceux-ci, et un second co-stabilisant choisi parmi TiO2, PdO2, V02, GeO2, et des combinaisons de ceux-ci. Éventuellement, le constituant stabilisateur comporte Y2O3. Le constituant stabilisateur est présent en une quantité efficace pour obtenir la phase majoritairement tétragonale dans le revêtement.
Boutwell Brett
Fu Ming
Hazel Brian Thomas
Johnson Curtis Alan
Lipkin Don M.
Company General Electric
Craig Wilson And Company
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