Compositions – Magnetic – With wax – bitumen – resin – or gum
Patent
1976-04-19
1978-08-29
Edmundson, F.C.
Compositions
Magnetic
With wax, bitumen, resin, or gum
252 6252, H01F 1117
Patent
active
041102363
ABSTRACT:
A method for nondestructive magnetic particle inspection of an object or part, especially parts having complex configurations, for detection of defects and metallurgical conditions therein, by placing a novel magnetic recording medium in the form of a magnetizable preferably putty-like material on the surface of the object, magnetizing the object and such putty-like material in contact with the object, and recording on such magnetizable putty-like material, magnetic particle indications of such defects and metallurgical conditions, removing the so-magnetized putty-like material from the object, placing a viewing device on the area of the magnetized putty-like material previously in contact with the object, such device preferably being one containing a suspension of weakly ferromagnetic crystals in a transparent liquid vehicle, and having a transparent portion to permit viewing such suspension, and viewing through such device the outlines and indications of the defects and metallurgical conditions in the object, produced by the reorientation of the ferromagnetic particles of the suspension, and corresponding to the magnetic particle indications recorded on the magnetized putty-like material. A novel rubbery to putty-like magnetic recording medium is preferably in the form of a silicone polymer containing magnetic particles.
REFERENCES:
patent: 2601212 (1952-06-01), Polydorff
patent: 2744040 (1956-05-01), Altmann
patent: 2849312 (1958-08-01), Peterman
patent: 3029157 (1962-04-01), Sutheim et al.
patent: 3384498 (1968-05-01), Ahrabi
patent: 3470021 (1969-09-01), Hendricx et al.
patent: 3681137 (1972-08-01), Nagazono et al.
patent: 3740266 (1973-06-01), Akashi et al.
patent: 3862047 (1975-01-01), Weltman et al.
Edmundson F.C.
Rockwell International Corporation
Silberberg Charles T.
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