Stock material or miscellaneous articles – All metal or with adjacent metals – Foil or filament smaller than 6 mils
Patent
1979-08-14
1981-08-25
Kucia, Richard R.
Stock material or miscellaneous articles
All metal or with adjacent metals
Foil or filament smaller than 6 mils
2191451, 2191461, 428385, 428665, B23K 3522, B32B 1502
Patent
active
042860261
ABSTRACT:
A process for implanting a precise quantity of radioactive metal on a metal substrate such as a cutting tool or other metal part subject to wear at the area or areas where the part is expected to wear during its operation. The presence of the radioactive spot can be sensed to determine the extent of wear during use. The radioactive metal is deposited from a wire formed of a core of the radioactive metal surrounded by a sheath of metal having a high thermal and electrical conductivity relative to the core. In operation, the wire contacts the metal surface under pressure and electric current is passed through the wire in order to (1) form a pit on the tool surface, (2) weld the radioactive metal in the pit and (3) evaporate a small portion of the conductive sheath adjacent the pit. A second current then is passed through the wire to break it near the bottom of the pit, leaving a small quantity of radioactive material welded to the bottom of the pit.
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Cook Nathan H.
Subramanian Krishnamoorthy
Cook Paul J.
Kucia Richard R.
Massachusetts Institute of Technology
Smith, Jr. Arthur A.
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