Method for the preparation of sinterable nitrides
US4929433A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 29, 1988 |
| Grant date | May 29, 1990 |
| Priority date | — |
| Expiry date | Apr 29, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/12
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Nitride powders of high surface area, uniform small particle size and high purity are prepared by forming in an aqueous medium a homogeneous combination of a soluble or colloidally dispersible compound of a multivalent metal with a water soluble oxygen oxygenated carbonaceous polymer, e.g., by mixing an aluminum or other metal salt with polyacrylic acid or mixing colloidal hydrated alumina, or other such metal oxide, with a water soluble oxygenated carbonaceous polymer such as sucrose or methyl cellulose. The resulting precipitate or gel is dried and calcined in a nitriding atmosphere, forming a nitride powder which is highly suitable for fabrication of ceramic bodies by sintering at lower than conventional temperatures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.