Burnishing diamond
US4662348A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 20, 1985 |
| Grant date | May 5, 1987 |
| Priority date | — |
| Expiry date | Jun 20, 2005 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2300/02
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.