Burnishing diamond

Details Burnishing diamond Burnishing diamond

1985-06-20

1987-05-05

Whitehead, Harold D.

Stone working

Precious stone working

51283R, 5116573, 3849071, F41B 1500

Patent

active

046623485

ABSTRACT:
Scratch-free polished diamond is obtained by rubbing a surface of the diamond to be polished against a smooth complementary diamond surface with sufficient pressure and velocity to heat the surface being polished above the spontaneous thermal degradation temperature of the diamond. Such a method can be used to burnish diamond-on-diamond bearings in as little as ten minutes as compared with up to three weeks by prior polishing techniques. Excessive thermal degradation of the diamond is avoided by cooling the surface being polished, preferably by cooling intermittently. The same techniques are usable for other superhard material such as cubic boron nitride.

REFERENCES:
patent: 2931351 (1960-04-01), Custers
patent: 3436868 (1969-04-01), Christensen
patent: 3698513 (1972-10-01), Espunes
patent: 3886695 (1975-06-01), Elbe
patent: 3902283 (1975-09-01), Bean
patent: 4370835 (1983-02-01), Schneidemesser
patent: 4401876 (1983-08-01), Cooper
patent: 4425900 (1984-01-01), Bosschaert
patent: 4484418 (1984-11-01), Reich

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