Refractory metal oxide processes
US4883619A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 24, 1986 |
| Grant date | Nov 28, 1989 |
| Priority date | — |
| Expiry date | Feb 24, 2006 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21H1/02
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A process for producing a sturdy refractory metal oxide articles includes the steps of heating a substrate or organic material impregnated with a metal nitrate compound in an atmosphere in which the partial pressure of oxygen is less than two mm Hg to increase the temperature of the substrate at a rate of at least two degrees Celsius per minute to thermally decompose the metal nitrate compound as a step in the conversion of the metal nitrate compound to a refractory metal oxide such that evolved oxides of nitrogen interact with the organic substrate material to partially oxidize the organic substrate material. The impregnated substrate is then further heated in an atmosphere containing an increased amount of oxygen to decompose and remove the organic material from the impregnated substrate and to complete the conversion of the metal nitrate compound to the refractory metal oxide so that a metal oxide replica of the substrate remains; and then the metal oxide replica is further heated to sinter and strengthen the metal oxide replica such that the replica retains strength after the replica has been heated to a temperature of 1500.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.