Method of making silicon nitride comprising objects
US4477402A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 19, 1983 |
| Grant date | Oct 16, 1984 |
| Priority date | — |
| Expiry date | Jul 19, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/593
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of making a heat fused silicon nitride comprising object is disclosed. A series of measured powder shots are containerized to be carried in the container between the nitriding and heat fusing steps. The containerization comprises lining the internal wall of a graphitic sleeve, treated for inertness, with a refractory metal foil essentially impervious to migration of carbon ions and having a thickness of 0.2 inches or less. A series of measured shots, of a powder mixture of silicon and oxygen carrying agents, is inserted into the assembly, each shot being separated by an inert spacer. The assembly is subjected to a nitriding treatment and subsequently hot pressed/or sintered.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.