Environmental barrier coatings providing cmas mitigation...

Details Environmental barrier coatings providing cmas mitigation... Environmental barrier coatings providing cmas mitigation...

C - Chemistry, Metallurgy

23

C

C23C 28/00 (2006.01) F01D 5/28 (2006.01)

Patent

CA 2746450

Environmental barrier coatings having CMAS mitigation capability for silicon- containing components. In one embodiment, the barrier coating includes a bond coat layer comprising aluminide-alumina TGO; and an outer layer selected from the group consisting of AeA112O19, AeHfO3, AeZrO3, ZnA12O4, MgA12O4, Ln4A12O9, Lna4Ga2O9, Ln3A15O12, Ln3Ga5O12, Ga2O3, HfO2, and LnPO4. "Ae" represents Mg, Ca, Sr, Ba and mixtures thereof. "Ln" represents Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and mixtures thereof. "Lna" represents La, Ce, Pr, Nd, Pm, Sm, Eu, Gd and mixtures thereof.

L'invention concerne un revêtement formant une barrière environnementale présentant la capacité d'atténuer le CMAS pour des composants contenant du silicium. Dans un mode de réalisation, le revêtement formant barrière comprend une couche de revêtement de liaison constituée d'aluminiure-alumine TGO; et une couche extérieure sélectionnée dans le groupe constitué par AeA112O19, AeHfO3, AeZrO3, ZnA12O4, MgA12O4, Lna4Ga2O9, Ln3A15O12, Ln3Ga5O12, Ga2O3, HfO2, et LnPO4. Ae représente Mg, Ca, Sr, Ba et des mélanges de ceux-ci. Ln représente Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, T5, Dy, Ho, Er, Tm, Y5, Lu et des mélanges de ceux-ci. Lna représente La, Ce, Pr, Ndr, Pm, Sm, Gu, Gd et des mélanges de ceux-ci.

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