Cell and method for forming a composite hard material and composite hard materials formed thereby
US6346689B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 19, 2000 |
| Grant date | Feb 12, 2002 |
| Priority date | — |
| Expiry date | Jul 19, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2237/525
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A cell for forming a composite hard material and hard materials and methods of forming composite hard materials. A cell (10) in which the article is formed includes a talc outer sleeve (12), a glass sleeve (14) and a reflecting foil (22). A heater (18) is arranged inwardly of the foil (22) and a barrier layer (16) is arranged inwardly of the glass sleeve (14). A central column (20) is defined for receiving the charge of material (50) from which the hard composite material is to be formed. The charge material is located in a mold (76, 100) which can define the final shape of the article thereby avoiding the need for additional machining, and the mold and charge material are subject to high temperature and pressure to form the composite material while maintaining the charge subject to hydrostatic pressure during the application of pressure and high temperature and maintaining a low temperature gradient across the charge during formation of the composite hard material to reduce uneven pressurization of the composite hard material. The article may also be formed by forming first and second mixtures (120, 130) of composite hard material so as to form an outer surface on the article whic…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.