Process for direct nitriding of metals of low melting point
US5314675A · kind A · utility
Inventors
Key dates
| Filing date | Jan 3, 1992 |
| Grant date | May 24, 1994 |
| Priority date | — |
| Expiry date | Jan 3, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/591
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Process for direct nitriding of metals of relatively low melting point with the aid of a nitrogen-containing gas, in which a powder of at least one of the metals is mixed with a refractory powder, the mixture is heated under an atmosphere of nitrogen-containing gas at atmospheric pressure until the start of a rapid and exothermic nitriding reaction, and this reaction, which proceeds at a temperature generally higher than that of the melting point of the metals without apparent melting being observed, is allowed to proceed until all of the metals have been consumed, in order to obtain a highly porous solid mass which is easy to grind and is based on metal nitrides or metal oxynitrides.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.