GB395537A - Improvements in highly emissive cathodes for electric discharge apparatus - Google Patents
Improvements in highly emissive cathodes for electric discharge apparatusInfo
- Publication number
- GB395537A GB395537A GB25305/32A GB2530532A GB395537A GB 395537 A GB395537 A GB 395537A GB 25305/32 A GB25305/32 A GB 25305/32A GB 2530532 A GB2530532 A GB 2530532A GB 395537 A GB395537 A GB 395537A
- Authority
- GB
- United Kingdom
- Prior art keywords
- wire
- metal
- highly emissive
- coating
- tungsten
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Solid Thermionic Cathode (AREA)
Abstract
395,537. Thermionic cathodes. LOEWE, S., 10, Wiesenweg, Steglitz, Berlin. Sept. 12, 1932, No. 25305. Convention date, Sept. 15, 1931. [Class 39 (i).] In a process for manufacturing highly emissive cathodes for rectifiers, amplifiers, or oscillation generators, a superficially oxidized cathode core, for example a tungsten wire, is introduced into an atmosphere of a highly emissive metal, such as barium, in a vacuum furnace'and heated to such a temperature that it reacts with the vapour to form a coating of barium oxide on the wire, after which the excess of vapour is removed, either by pumping or condensing, and a part of the wire is mounted as a cathode in a thermionic tube, heated to degasify it and convert any residual hydroxide or carbonate into the pure metal oxide, and finally provided with a coating of a highly emissive metal which is evaporated within the tube. The latter metal may be the same as that which is vaporized to form the oxide coating, but preferably consists of a light metal having a higher evaporation point. The filament material, preferably tungsten, may be coated initially with tungsten dioxide by introducing a loosely wound coil of the wire into a furnace containing hydrogen with a proportion of water.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE395537X | 1931-09-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB395537A true GB395537A (en) | 1933-07-20 |
Family
ID=6396858
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB25305/32A Expired GB395537A (en) | 1931-09-15 | 1932-09-12 | Improvements in highly emissive cathodes for electric discharge apparatus |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2049811A (en) |
| FR (1) | FR742822A (en) |
| GB (1) | GB395537A (en) |
| NL (1) | NL40189C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL274464A (en) * | 1961-02-07 |
-
0
- FR FR742822D patent/FR742822A/fr not_active Expired
- NL NL40189D patent/NL40189C/xx active
-
1932
- 1932-09-12 GB GB25305/32A patent/GB395537A/en not_active Expired
- 1932-09-14 US US633080A patent/US2049811A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| FR742822A (en) | 1933-03-17 |
| NL40189C (en) | |
| US2049811A (en) | 1936-08-04 |
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