C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 8/02 (2006.01) B23K 9/167 (2006.01) B23K 35/00 (2006.01) B23P 6/00 (2006.01) C21D 3/00 (2006.01) C23C 28/00 (2006.01) C23G 5/00 (2006.01)
Patent
CA 2204811
A method for repairing an environmental protective coated article portion of a gas turbine engine article made of a Ni base superalloy including Cr and at least about 6 wt. % total of Al and Ti comprises removing the coating, exposing the article portion to a reducing mixture of gases including, by weight, greater than 6% up to about 20% hydrohalogen gas with the balance principally hydrogen gas, and preferably about 10 - 15 wt. % hydrogen fluoride gas. Exposure is at a temperature in the range of about 1600° - 2000° F for a time, greater than about 2 hours, and preferably about 2 - 10 hours, sufficient to remove from within the article portion metal sulfides, Al, Ti, oxides of Al or Ti, or their combinations. Then the article portion is recoated. One form relates to weld repairing the article portion by removing A1 or Ti or both to a depth up to about 0.003". Another form removes metal sulfides, resulting from or relating to combustion, from within the body of the article portion to a depth up to about 0.005".
Miller Merrill A.
Rasch Lyle T.
Reverman Jeffrey J.
Company General Electric
Craig Wilson And Company
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