Radiant energy – Radiation tracer methods
Patent
1975-05-15
1976-11-02
Borchelt, Archie R.
Radiant energy
Radiation tracer methods
25230119, G01N 2116
Patent
active
039899497
ABSTRACT:
Liquid oxygen-compatible water washable substantially biodegradable dye penetrant composition having excellent sensitivity and high stability, for use in non-destructive dye penetrant inspection particularly of parts or mechanical components which are later placed in contact with liquid oxygen, such composition consisting essentially of an organic dye, preferably a fluorescent dye, a carrier or solvent for said dye, in the form of certain ethoxylated linear alcohols, particularly the biodegradable nonionic surfactants comprised of ethoxylates of a mixture of secondary alcohols having linear alkyl chains of from 11 to 15 carbon atoms, and an average of from 3 to 12 moles of ethylene oxide, and a nonflammable liquid halocarbon which is volatile at room temperature, e.g. 1,1,1-trichloroethane.
In the method of application of the dye penetrant composition, such composition is applied to the surface of an object containing cracks and flaws, and following rapid evaporation of the halocarbon solvent, water is applied to the surface of the object to remove excess liquid dye penetrant composition from the surface without removing such penetrant from the cracks and defects, and with or without a developer, the surface of the object is viewed under suitable lighting conditions, e.g. ultraviolet or black light when the dye in the penetrant is a fluorescent dye, to locate any cracks or defects in the surface of the body as indicated by colored traces from the dye penetrant remaining in the cracks and flaws. Upon evaporation of the solvent, residual dye penetrant remaining on the object surface is rendered nonsensitive or nonreactive with liquid oxygen.
REFERENCES:
patent: 3489898 (1970-01-01), Alburger
patent: 3567651 (1971-03-01), Giles et al.
patent: 3753647 (1973-08-01), Molina
patent: 3915886 (1975-10-01), Molina
Borchelt Archie R.
Humphries L. Lee
Rockwell International Corporation
Silberberg Charles T.
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