Methods for preparation of tetragonal zirconia polycrystal composites
US5556816A · kind A · utility
Inventors
Key dates
| Filing date | Mar 1, 1995 |
| Grant date | Sep 17, 1996 |
| Priority date | — |
| Expiry date | Mar 1, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/488
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for the preparation of tetragonal zirconia polycrystal composite with high toughness and low-temperature degradation resistance. The method comprising adding transformable TZP of ZrO.sub.2 --Y.sub.2 O.sub.3 --Nb.sub.2 O.sub.5 /Ta.sub.2 O.sub.5 system to non-transformable TZP of ZrO.sub.2 --Y.sub.2 O.sub.3 --Nb.sub.2 O.sub.5 /Ta.sub.2 O.sub.5 system in an amount of not more than 60% by weight based on the total weight of the resulting mixture; and sintering the mixture at above 1,500.degree. C. Even though being exposed to a temperature ranging from 100.degree. to 400.degree. C. for a long time in air, the TZP composite prepared by the present method is rarely transformed into monoclinic zirconia and yet exhibits high toughness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.