Method of producing mixed metal oxide material, and of producing a body comprising the material
US4996189A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 24, 1988 |
| Grant date | Feb 26, 1991 |
| Priority date | — |
| Expiry date | Oct 24, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T156/1339
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A novel method of producing mixed metal oxide powder (e.g., ferrite powder, or high temperature superconductor powder such as YBa.sub.2 Cu.sub.3 O.sub.x powder) is disclosed. The method comprises forming an intimate mixture of appropriate metal salts (e.g., nitrates and acetates), at least one of which is an oxidizing agent with respect to at least one of the others, and heating the mixture to a reaction temperature such that an exothermic redox reaction occurs. Appropriate choice of oxidizing and reducing agents permits control of heat of reaction and reaction temperature. The product of the reaction typically is a precursor of the desired mixed oxide, the precursor typically consisting essentially of the metal constituents of the mixed oxide and oxygen. Heat treatment in an O.sub.2 -containing atmosphere transforms the precursor into the desired mixed oxide powder. The thus produced powder can then be used in conventional fashion, e.g., to produce bodies therefrom by pressing and/or sintering.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.