GB1073341A - Process for the production of thoriated highly emitting cathodes - Google Patents
Process for the production of thoriated highly emitting cathodesInfo
- Publication number
- GB1073341A GB1073341A GB23740/64A GB2374064A GB1073341A GB 1073341 A GB1073341 A GB 1073341A GB 23740/64 A GB23740/64 A GB 23740/64A GB 2374064 A GB2374064 A GB 2374064A GB 1073341 A GB1073341 A GB 1073341A
- Authority
- GB
- United Kingdom
- Prior art keywords
- thoriated
- rhenium
- tungsten
- palladium
- cathodes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/02—Manufacture of electrodes or electrode systems
- H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
- H01J9/042—Manufacture, activation of the emissive part
Abstract
In a process for producing a thoriated cathode, a metal carbide of the composition M2C, where M is a refractory metal from the group VIA of the Periodic System, present in close-packed hexagonal form, is converted into a body-centred cubic form at elevated temperature by the presence of an element from the groups IB, VIIA or VIIIA of the Periodic System, e.g. silver, manganese, rhenium or palladium. The invention may be applied to carburized, thoriated tungsten or molybdenum cathodes of wire or strip form, or to carburized sintered cathodes produced from thorium oxide with tungsten and/or molybdenum, for use in rectifiers, thyratons or gaseous discharge lamps. In particular, a tungsten carbide filament may be coated with rhenium by thermal decomposition in an atmosphere of rhenium pentachloride and then subjected to diffusion heating in vacuo at 2,400 DEG K until the hexagonal form of the tungsten carbide has substantially disappeared. Alternatively, the filament may be coated with palladium by electrodeposition and then subjected to diffusion heating at 1600 DEG K.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL6405662A NL6405662A (en) | 1964-05-21 | 1964-05-21 | |
| US72713668A | 1968-04-23 | 1968-04-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1073341A true GB1073341A (en) | 1967-06-21 |
Family
ID=26643771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB23740/64A Expired GB1073341A (en) | 1964-05-21 | 1964-06-09 | Process for the production of thoriated highly emitting cathodes |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US3600334A (en) |
| GB (1) | GB1073341A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6053418B2 (en) * | 1976-08-09 | 1985-11-26 | 株式会社日立製作所 | Electron tube cathode structure |
| US4308059A (en) * | 1979-06-28 | 1981-12-29 | Gte Products Corporation | Capillary |
| US4663559A (en) * | 1982-09-17 | 1987-05-05 | Christensen Alton O | Field emission device |
| DE10115901C1 (en) * | 2001-03-30 | 2002-08-08 | Siemens Ag | Thermionic emitter |
-
1964
- 1964-06-09 GB GB23740/64A patent/GB1073341A/en not_active Expired
-
1968
- 1968-04-23 US US727136A patent/US3600334A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US3600334A (en) | 1971-08-17 |
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