Heat-insulating protective layer for a component located...

C - Chemistry – Metallurgy – 23 – C

Patent

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Details

C23C 28/00 (2006.01) C23C 30/00 (2006.01)

Patent

CA 2629066

Disclosed is a heat-insulating protective layer for a component located within the hot gas zone of a gas turbine. Said protective layer is composed of an adhesive layer, a diffusion layer, and a ceramic layer which is applied to the high temperature-resistant basic metal of the component. The adhesive layer comprises a metal alloy [MCrAlY (M = Ni, Co) ] containing Ni, Co, Cr, Al, Y, the diffusion layer is produced by calorizing the adhesive layer, and the ceramic layer is composed of ZrO2 which is partially stabilized by means of yttrium oxide. One or several chemical metal elements that have a large atomic diameter and are selected among the group comprising Re, W, Si, Hf, and/or Ta are alloyed to the material of the adhesive layer. The adhesive layer has the following chemical composition after being applied: Co 15 to 30 percent, Cr 15 to 25 percent, Al 6 to 13 percent, Y 0.2 to 0.7 percent, Re up to 5 percent, W up to 5 percent, Si up to 3 percent, Hf up to 3 percent, Ta up to 5 percent, the remainder being composed of Ni.

L'invention concerne une couche de protection calorifuge destinée à un composant situé dans la zone des gaz chauds d'une turbine à gaz, composée d'une couche adhésive, d'une couche de diffusion et d'une couche céramique appliquée sur le métal de base du composant, résistant aux température élevées. La couche adhésive est composée d'un alliage métallique [MCrAlY (M = Ni, Co) ] contenant Ni, Co, Cr, Al et Y, la couche de diffusion est produite par calorisation de la couche adhésive et la couche céramique est composée de ZrO2 partiellement stabilisé par de l'oxyde d'yttrium. Le matériau de la couche adhésive est additionné d'un ou plusieurs éléments chimiques, métalliques, présentant un diamètre atomique élevé, du groupe Re, W, Si, Hf et/ou Ta. Après application, la couche adhésive présente la composition chimique suivante : 15 à 30 % de Co, 15 à 25 % de Cr, 6 à 13 % d'Al, 0,2 à 0,7 % d'Y, jusqu'à 5 % de Re, jusqu'à 5 % de W, jusqu'à 3 % de Si, jusqu'à 3 % de Hf, jusqu'à 5 % de Ta, et le reste de Ni.

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