Cutting structures for rotary drill bits
US4781256A · kind A · utility
7Cited by
10References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 30, 1987 |
| Grant date | Nov 1, 1988 |
| Priority date | — |
| Expiry date | Jun 30, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2237/76
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method of forming a cutting structure for a rotary drill bit comprises brazing a thermally stable polycrystalline diamond cutting element to a carrier, the carrier being formed of a material such that, at the brazing temperature, the difference in coefficient of thermal expansion between said material and the polycrystalline diamond material is less than the difference in coefficient of thermal expansion between tungsten carbide and the polycrystalline diamond material. A suitable carrier material is silicon carbide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.