Method of making a diamond-coated composite body
US5635256A · kind A · utility
17Cited by
3References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 17, 1996 |
| Grant date | Jun 3, 1997 |
| Priority date | — |
| Expiry date | Apr 17, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C16/274
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
At least the surface region of a cutting tool substrate made of tungsten carbide in a cobalt matrix is carburized to chemically passivate the cobalt prior to deposition of diamond film on it. The passivation improves adhesion by preventing reaction of the cobalt with the diamond in the course of the deposition process. To further improve adhesion of the diamond, cobalt is removed from the exposed surfaces of the tungsten carbide grains by heat treatment in inert gas or by hydrogen plasma.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.