Fabrication of rods of uniform high density from powders of refractory materials
US4857249A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 16, 1988 |
| Grant date | Aug 15, 1989 |
| Priority date | — |
| Expiry date | Aug 16, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC30B29/36
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Cylindrical rods of titanium carbide or other refractory material with uniform, high density are prepared by hot pressing plates from powders of the material, with a uniaxial pressing pressure applied to the broad faces of the plate. Bars of square cross section are then cut from the plate and machined to cylindrical rods. The process is particularly suited to the preparation of refractory material preforms to be used in single crystal growth by the float zone method. Titanium carbide rods having a highly uniform density of about 96% that of the theoretical maximum can be readily prepared and then grown into titanium carbide crystals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.