Polycrystalline diamond cutter with integral carbide/diamond transition layer
US5875862A · kind A · utility
197Cited by
13References
29Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 14, 1997 |
| Grant date | Mar 2, 1999 |
| Priority date | — |
| Expiry date | Jul 14, 2017 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/5735
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A composite body cutting instrument formed of a polycrystalline diamond layer sintered to a carbide substrate with a carbide/diamond transition layer. The transition layer is made by creating carbide projections perpendicular to the plane of the carbide substrate face in a random or nonlinear orientation. The transition layer manipulates residual stress caused by both thermal expansion and compressibility differences between the two materials and thus increases attachment strength between the diamond and carbide substrate by adjusting the pattern, density, height and width of the projections.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.