C - Chemistry – Metallurgy – 23 – G
Patent
C - Chemistry, Metallurgy
23
G
C23G 1/00 (2006.01) C23G 1/02 (2006.01) C23G 1/10 (2006.01)
Patent
CA 2444929
A process for removing aluminosilicate-based material (e.g., "CMAS") from a substrate is described. The material is treated with an aqueous composition containing at least one acid having the formula H x AF6, in which A is Si, Ge, Ti, Zr, Al, and Ga; and x is 1-6. Treatment of the substrate is often carried out by immersion in an aqueous bath. The process is also very effective for removing CMAS-type material from cavities in the substrate; e.g., cooling holes in a gas turbine component. Related compositions are also described.
On décrit un procédé permettant de retirer une matière à base d'aluminosilicate (p. ex., le CMAS) d'un substrat. La matière est traitée avec une composition aqueuse contenant au moins un acide de formule H x AF6, où A est du Si, du Ge, du Ti, du Zr, du Al ou du Ga, et x se situe entre 1 et 6. Le traitement du substrat est souvent effectué par immersion dans un bain de solution aqueuse. Le procédé est également très efficace pour retirer les matières de type CMAS des cavités présentes dans le substrat, par exemple les orifices de refroidissement dans les composantes d'une turbine à gaz. On décrit également des compositions connexes.
Ferrigno Stephen J.
Johnson Curtis A.
Kool Lawrence B.
Rosenzweig Mark A.
Zimmerman Robert G. Jr.
Company General Electric
Craig Wilson And Company
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