C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 28/00 (2006.01) C04B 35/486 (2006.01) C04B 35/50 (2006.01) C23C 30/00 (2006.01)
Patent
CA 2417212
A device (10) comprising a substrate (22) having a deposited ceramic thermal barrier coating layer (20) characterized by a microstructure having gaps (28) where the thermal barrier coating (20) consists essentially of a pyrochlore crystal structure having a chemical formula consisting essentially of An+2- xBm+2+xO7-y, where A is selected from the group of elements selected from La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and mixtures thereof; where B is selected from the group of elements selected from Zr, Hf, Ti and mixtures thereof; n and m are the valence of A and B respectively, and for -0.5 <= x <= 0.5, y = formula (I), and excluding the following combinations for x = 0, y = 0: A = La and B = Zr; A = La and B = Hf; A = Gd and B = Hf; and A = Yb and B = Ti. The preferred pyrochlore crystal structure is Sm2Zr2O7, which is stable over the range of operating temperatures of the device (10) up to at least above 1400 ~C, and where the thermal barrier coating (30) can be deposited over a separate bottom fluorite thermal barrier coating.
L'invention concerne un dispositif (10) comprenant un substrat (22) sur lequel est déposé une couche de revêtement à barrière thermique en céramique (20) constituée d'une microstructure à intervalles (28). Ledit revêtement (20) est principalement à base de structure cristalline au pyrochlore essentiellement représentée par la formule A?n+¿¿2-x?B?m+¿¿2+x?O¿7-y?. A peut appartenir au groupe des éléments suivants: La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, y compris leurs mélanges. B peut appartenir au groupe des élément suivants: Zr, Hf, Ti, y compris leurs mélanges; n et m expriment respectivement la valence de A et B, et pour -0,5 <= x <= 0,5, y = formule (I), sachant que l'on exclut les combinaisons suivantes pour x = 0, y = 0: A = La et B = Zr; A = La et B = Hf; A = Gd et B = Hf; et A = Yb et B = Ti. La structure de pyrochlore préférée est Sm2Zr2O7, cette structure étant stable sur la gamme des températures de fonctionnement du dispositif (10) au moins au-delà de 1400 ·C, et le revêtement à barrière thermique (30) peut être déposé sur un revêtement de fonds à barrière thermique en fluorine séparé.
Borden Ladner Gervais Llp
Siemens Energy Inc.
Siemens Westinghouse Power Corporation
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