Method of forming a sintered ceramic product
US3989782A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1974 |
| Grant date | Nov 2, 1976 |
| Priority date | — |
| Expiry date | Dec 23, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/111
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
In a method of forming a sintered, ceramic product, aluminium nitride is reacted with silica at a temperature of between 1200.degree. and 2000.degree. C to form a single phase silicon aluminium oxynitride ceramic material, the reaction mixture at said temperature containing not more than 60% by weight of the aluminium nitride and also containing first and second metal oxides other than silica. The metal oxides are arranged so that they do not introduce into the mixture a combination of magnesium oxide and alumina alone and further are arranged so that during the reaction they combine with part of said silica to form a silicate glass having a liquidus temperature below that of the silicate glass which would be formed from silica with either of said metal oxides alone. The silicate glass formed then aids densification of the ceramic material during sintering.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.