Method of forming ceramic products
US3991148A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 1975 |
| Grant date | Nov 9, 1976 |
| Priority date | — |
| Expiry date | Nov 14, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2235/96
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
In a method of forming a refractory product wherein a mixture consisting of effective amounts of silica, alumina, aluminium nitride, and with or without silicon nitride, is provided, the mixture is surrounded with a protective medium and sintered at a temperature between 1200.degree.-2000.degree. C to form a single phase silicon aluminium oxynitride corresponding to the formula: Si.sub.6.sub.-z Al.sub.z N.sub.8.sub.-z O.sub.z, where z is greater than zero and less than or equal to 5, and when there is no silicon nitride in the mixture z is greater than or equal to 4 and less than or equal to 5, the improvement being the step of introducing into said mixture magnesium oxide in an amount of not more than 5% by weight to form a magnesium silicate glass and aid in densification of the ceramic material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.