Non-oxide ceramic particles coated with zirconium oxide or hydrous oxide
US5266404A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 5, 1991 |
| Grant date | Nov 30, 1993 |
| Priority date | — |
| Expiry date | Jul 5, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2993
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A composition suitable for the production of ceramics is provided. The composition comprises a particulate material which is a nitride, carbide, carbonitride or boride of Ti, Zr, Al, Si or B having a coating on the particle comprising 5 to 75 wt % with respect to particulate material of an oxide or hydrous oxide of zirconium. The composition can be used to produce a tough zirconia/non-oxide ceramic without the need to co-mill the ingredients. A stabilising agent for the zirconia may also be present in the coating although the invention is designed to avoid the necessity for such agents. Coating usually is effected by a wet treatment process in which the particles are dispersed in a solution of a hydrolysable zirconium salt and the oxide or hydrous oxide is coated on the particles by adjusting the pH of the dispersion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.