Cleaning process for internal passages of superalloy airfoils

Details Cleaning process for internal passages of superalloy airfoils Cleaning process for internal passages of superalloy airfoils

1982-03-01

1984-03-27

Fisher, Richard V.

Cleaning and liquid contact with solids

Processes

Hollow work, internal surface treatment

134 2218, 134 29, 134 30, B08B 308

Patent

active

044392419

ABSTRACT:
Residues accumulated during use are removed from the small interior cavities of superalloy airfoils by a process which includes exposing the interior of the part to an aqueous solution of 20-45% potassium hydroxide at a pressure of 10.4-24 kPa (150-350 psi) and temperature of 150.degree.-235.degree. C. (300.degree.-450.degree. F.) for about 20 hours, followed by water blasting using a pressure greater than about 14 MPa (2,000 psi). Unless the part is kept continuously wet between the first and second steps, the second step will not be effective.

REFERENCES:
patent: 3121026 (1964-02-01), Beigay et al.
patent: 3126301 (1964-03-01), Faler
patent: 4073662 (1978-02-01), Borom
patent: 4134777 (1979-01-01), Borom
patent: 4317685 (1982-03-01), Ahuja et al.

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