Highly toughened, sintered mass of zirconia
US4748138A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 16, 1984 |
| Grant date | May 31, 1988 |
| Priority date | — |
| Expiry date | Jul 16, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/4885
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Ceramic sintered mass having a mean grain size of no more than 3 microns of high toughness even at high temperatures is obtainable, the mass comprising 30-99.5% by weight of a component A as defined below and the balance being a component B as defined below: PA0 Component A: zirconia having a tetragonal and/or cubic system content of no less than 90% by weight, with the proviso that the tetragonal/cubic system ratio by weight is no less than 0.25, said zirconia including a stabilizer of Y.sub.2 O.sub.3, CaO, MgO, etc. PA0 Component B: one or more of borides, carbides and nitrides of Al, Si and an element in the groups 4a, 5a and 6a of the periodic table, and Al.sub.2 O.sub.3. The balance may incorporate a further component C, such as SiO.sub.2, Fe.sub.2 O.sub.3 and TiO.sub.2 and the like of no more than 3% by weight in the sintered mass.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.