Repair of surface defects in superalloy articles

Details Repair of surface defects in superalloy articles Repair of surface defects in superalloy articles

1986-08-04

1987-11-10

Jordan, M.

Metal fusion bonding

Process

Repairing, restoring, or renewing product for reuse

B23P 604, B23P 104

Patent

active

047052031

ABSTRACT:
Methods of repairing defects in superalloy articles are described. Defective areas are cleaned and prepared to expose clean substrate surfaces. A layer of superalloy powder material containing a melt depressant (boron) is applied. A layer of superalloy material essentially free from boron is then applied. The dual coated article is heated to a temperature at which the boron containing layer melts, but the boron-free layer does not. The boron diffuses into the substrate raising the melting point of the molten material until solidification results. The unmelted surface layer is subsequently removed leaving behind a repaired article free from surface defects.

REFERENCES:
patent: 3947606 (1976-03-01), Rohr et al.
patent: 4008844 (1977-02-01), Duvall et al.
patent: 4078977 (1978-03-01), Fountain
patent: 4233490 (1980-11-01), Shalai et al.
patent: 4285459 (1981-08-01), Baladjanian et al.
patent: 4382169 (1983-05-01), Rabkin et al.
patent: 4442968 (1984-04-01), McMurray et al.
patent: 4459062 (1984-07-01), Siebert
patent: 4493451 (1985-01-01), Clark et al.

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