Method of producing a ceramic product
US4127416A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 13, 1977 |
| Grant date | Nov 28, 1978 |
| Priority date | — |
| Expiry date | Jul 13, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/597
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of producing a ceramic product which comprises the step of forming a powder mixture consisting essentially of a first component consisting of compounds containing the elements silicon, aluminum, oxygen and nitrogen in proportion such that the ratio of the total number of silicon and aluminum atoms to the total number of oxygen and nitrogen atoms lies in the range 0.735 to 0.77 and such that said compounds react together during the subsequent sintering process to produce a single phase ceramic material obeying the general formula: EQU Si.sub.6-z Al.sub.z O.sub.z N.sub.8-z where z is between 0.38 and 1.5, and between 0.1 and 10% by weight of a second component in the form of an oxide of at least one of the further elements yttrium, scandium, cerium, lanthanum and the metals of the lanthanide series. The mixture is then sintered in a protective environment at a temperature between 1600.degree. C and 2000.degree. C and for a time, decreasing with increasing temperature, of at least 10 minutes to at least 5 hours so as to produce a ceramic material containing at least 80% by volume of said single phase ceramic material together with a second phase containing said at least one f…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.