Directional catalyst alloy sweep through process for preparing diamond compacts
US4778486A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 4, 1985 |
| Grant date | Oct 18, 1988 |
| Priority date | — |
| Expiry date | Feb 4, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB24D3/04
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Disclosed is an improved method for making a polycrystalline diamond compact comprising subjecting a mass of diamond particles, which mass is adjacent a cemented metal carbide mass containing a catalyst, to a high pressure/high temperature process which results in a compact characterized by diamond-to-diamond bonding. The improvement in such process comprises placing a second catalyst source adjacent the diamond mass, said second catalyst having a metal point which is lower than the melting point of the catalyst of the carbide; and subjecting said mass to high pressure/high temperature sintering at a temperature above the melting point of the second catalyst, but below the melting point of the carbide catalyst, for causing said second catalyst to selectively diffuse through said mass for forming said polycrystalline diamond compact. The preferred catalyst is a mixture of cobalt and boron.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.