Method of coating cathode heaters
US3940326A · kind A · utility
2Cited by
1References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 16, 1972 |
| Grant date | Feb 24, 1976 |
| Priority date | — |
| Expiry date | Feb 16, 1992 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D13/02
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A solution containing dissolved tungsten and dissolved aluminum is spray dried to recover a tungsten-and-aluminum containing powder. The powder is then fired to eliminate hydrated water and volatiles and to convert the aluminum compound into alumina. The powder is next fired at a higher temperature in a reducing atmosphere to reduce the tungsten compound to elemental tungsten. A coating suspension containing the tungsten-alumina powder is then prepared and electrophoretically deposited on cathode heaters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.