Method of making yttrium silicon oxynitrides
US4501723A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 19, 1983 |
| Grant date | Feb 26, 1985 |
| Priority date | — |
| Expiry date | Jul 19, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/10
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of making a powder additive consisting of yttrium silicon oxynitrides, preferably of the Y.sub.10 Si.sub.6 O.sub.24 N.sub.2 or YSiO.sub.2 N phases, is disclosed. Stoichiometric amounts of Y.sub.2 O.sub.3, SiO.sub.2, and Si.sub.3 N.sub.4 are mixed and arranged in intimate reactive contact, the amounts being to form a desired oxynitride according to the formula Y.sub.a Si.sub.b O.sub.c N.sub.d, where a, b, c and d represent the required element parts of the compound in equilibrium with the mixture elements. The mixture is heated in an inert atmosphere to a temperature and for a time sufficient to convert the stoichiometric amounts of the mixture to the desired yttrium silicon oxynitride. The heat agglomerated mixture is then ground to a powder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.