Metal working – Method of mechanical manufacture – Impeller making
Patent
1996-06-17
1999-05-04
Bryant, David P.
Metal working
Method of mechanical manufacture
Impeller making
2940201, 2940218, 228119, 148675, 148712, 134 2, B22D 1910
Patent
active
058989943
ABSTRACT:
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.degree.-2000.degree. 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 Al 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".
REFERENCES:
patent: 2380202 (1945-07-01), Stroup
patent: 2679466 (1954-05-01), Spendelow, Jr. et al.
patent: 3287181 (1966-11-01), Steverding
patent: 3490958 (1970-01-01), Robinson, Jr.
patent: 4098450 (1978-07-01), Keller et al.
patent: 4188237 (1980-02-01), Chasteen
patent: 4249963 (1981-02-01), Young
patent: 4285459 (1981-08-01), Baladjanian et al.
patent: 4324594 (1982-04-01), Chasteen
patent: 4381994 (1983-05-01), Smith, Jr. et al.
patent: 4405379 (1983-09-01), Chasteen
patent: 4434348 (1984-02-01), Reid
patent: 4842183 (1989-06-01), Antony et al.
patent: 5016810 (1991-05-01), Sikka
patent: 5319179 (1994-06-01), Joecks et al.
patent: 5346563 (1994-09-01), Allen et al.
patent: 5366563 (1994-11-01), McKenzie
patent: 5373986 (1994-12-01), Rafferty et al.
patent: 5728227 (1998-03-01), Reverman
Metals Handbook Ninth Edition--vol. 6, Welding, Brazing, and Soldering cover sheet, pp. 368 & 369.
"The HF `Flouride-Ion` Cleaning Technique for Superalloys", by Louis F. Pochet, Director, Coating Process Technology; Alfred L. Clavel, Vice President, Engineering; Ti-Coating, Inc., Mt. Clemens, MI 48045, pp. 1-6.
Miller Merrill A.
Rasch Lyle T.
Reverman Jeffrey J.
Bryant David P.
General Electric Company
Hess Andrew C.
Narciso David L.
LandOfFree
Method for repairing a nickel base superalloy article does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for repairing a nickel base superalloy article, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for repairing a nickel base superalloy article will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1860938