Composite diamond grain and method for production thereof
US5268201A · kind A · utility
9Cited by
9References
10Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | May 13, 1991 |
| Grant date | Dec 7, 1993 |
| Priority date | — |
| Expiry date | May 13, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC30B29/04
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A composite diamond grain which comprises a heat-resistant grain as a nucleus and discrete diamond crystal particles distributed on the surface of the grain or diamond crystal films formed to cover the entire surface of the grain and a method for producing the composite diamond grain by the vapor-phase process are disclosed. For the filament method which is one form of the vapor-phase method, tantalum is useful as the material for the filament. Since tantalum is susceptible of embrittlement by hydrogen, a treatment to be performed on tantalum for the elimination of this drawback is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.