12CaO-7Al2O3 electride hollow cathode
US9552952B2 · kind B2 · utility
2Cited by
4References
29Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 5, 2016 |
| Grant date | Jan 24, 2017 |
| Priority date | — |
| Expiry date | Apr 5, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J2237/08
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The use of the electride form of 12CaO-7Al2O3, or C12A7, as a low work function electron emitter in a hollow cathode discharge apparatus is described. No heater is required to initiate operation of the present cathode, as is necessary for traditional hollow cathode devices. Because C12A7 has a fully oxidized lattice structure, exposure to oxygen does not degrade the electride. The electride was surrounded by a graphite liner since it was found that the C12A7 electride converts to it's eutectic (CA+C3A) form when heated (through natural hollow cathode operation) in a metal tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.