| 摘要 |
PROBLEM TO BE SOLVED: To remove aluminosilicate-based material (e.g. CMAS) from a substrate. SOLUTION: The aluminosilicate-based material is treated with an aqueous composition having chemical formula H<SB>x</SB>AF<SB>6</SB>(wherein, A is selected from the group consisting of Si, Ge, Ti, Zr, Al and Ga; and x is 1 to 6) and containing at least one acid. Treatment of the substrate is often performed by immersion in an aqueous bath. The process is also very effective in the case of removing CMAS-type materials from cavities in the substrate, such as cooling holes in a gas turbine component. COPYRIGHT: (C)2004,JPO
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