Coated superalloy articles

C - Chemistry – Metallurgy – 23 – C

Patent

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C23C 28/00 (2006.01) C22C 19/05 (2006.01) C23C 4/00 (2006.01) C23C 4/08 (2006.01) C23C 4/12 (2006.01) F01D 5/28 (2006.01)

Patent

CA 2708887

Coated superalloy article includes a bond coat comprising an inner bond coat layer disposed on the first surface being formed by deposition of a bond coat composition comprising, in weight percent, 14-20 % Cr, 5-8 % Al, 8-12 % Co, 3-7 % Ta, 0.1-0.6 % Hf, 0.1-0.5 % Y, up to about 1% Si, 0.005-0.020 % Zr, 0.04-0.08 % C, 0.01-0.02% B, with a remainder including nickel (Ni) and incidental impurities, wherein the bond coating composition is substantially free of rhenium. An aluminum-containing layer overlies the inner bond coat layer. Optionally, a thermal barrier coating overlies the aluminum-containing layer, wherein the thermal barrier coating, if present, is formed by deposition of a thermal barrier coating composition.

La présente invention concerne un article en superalliage revêtu qui comprend une couche de liaison comprenant une couche de liaison interne disposée sur la première surface formée par dépôt d'une composition de couche de liaison comprenant, en pourcentage en poids, 14-20 % de Cr, 5-8 % de Al, 8-12 % de Co, 3-7 % de Ta, 0,1-0,6 % de Hf, 0,1-0,5 % de Y, jusqu'à environ 1% de Si, 0,005-0,020 % de Zr, 0,04-0,08 % de C, 0,01-0,02% de B, le reste étant formé par le nickel (Ni) et les impuretés inévitables, ladite composition étant sensiblement dépourvue de rhénium. Une couche contenant de l'aluminium surplombe la couche de liaison interne. Facultativement, un revêtement barrière thermique surplombe la couche contenant de l'aluminium, ledit revêtement barrière thermique, s'il existe, étant formé par dépôt d'une composition de revêtement barrière thermique.

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