Coprecipitation method for the manufacture of zinc oxide based doped powders
US4894185A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1987 |
| Grant date | Jan 16, 1990 |
| Priority date | — |
| Expiry date | Nov 30, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01G9/02
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for manufacturing a zinc oxide based powder by coprecipitation with one or more additions is disclosed. The method comprises: PA1 a step for the preparation of one or more solutions by dissolving defined quantities of salts of elements that go into the composition of the powder: zinc and addition(s), PA1 a step for the preparation of a buffer solution pre-saturated by the said elements, the said buffer solution possessing a pH which is defined so as to cause the precipitation of the hydroxylated compounds of elements corresponding to the elements saturating the buffer solution, PA1 a step during which the solutions are added to the said buffer solution, the drop in the pH being compensated for by the addition of a base and the volume of the buffer solution being kept constant by drawing off excess liquid, PA1 a step during which the precipitate obtained is treated to obtain the said powder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.