GB1170880A - Improvements in or relating to thorium-film thermionic cathodes for electrical discharge vessels. - Google Patents
Improvements in or relating to thorium-film thermionic cathodes for electrical discharge vessels.Info
- Publication number
- GB1170880A GB1170880A GB2933568A GB2933568A GB1170880A GB 1170880 A GB1170880 A GB 1170880A GB 2933568 A GB2933568 A GB 2933568A GB 2933568 A GB2933568 A GB 2933568A GB 1170880 A GB1170880 A GB 1170880A
- Authority
- GB
- United Kingdom
- Prior art keywords
- thorium
- tungsten
- layer
- rhenium
- outer layer
- 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
- H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
- H01J1/02—Main electrodes
- H01J1/13—Solid thermionic cathodes
- H01J1/14—Solid thermionic cathodes characterised by the material
Landscapes
- Solid Thermionic Cathode (AREA)
- Electrolytic Production Of Metals (AREA)
Abstract
1,170,880. Electrode materials and processing. SIEMENS A.G. 20 June, 1968 [21 June, 1967], No. 29335/68. Heading H1D. A thorium film thermionic cathode comprises a carrier of high melting-point metal containing thorium oxide with a surface coating consisting of an inner layer of tungsten carbide and an outer layer of a high melting-point metal through which thorium can migrate and which has a higher escape energy than tungsten, e.g. osmium or rhenium, the outer layer providing the emissive surface. The carrier metal may be tungsten or a tungsten-rhenium alloy containing 5-25% by weight rhenium. The thickness of the osmium or rhenium outer layer is preferably about 5 Á to ensure an adequate supply of thorium by diffusion through the layer, i.e. a dispersing action, and also to ensure sufficient separation of the carbide layer and the emissive surface. The outer layer may be deposited on the tungsten carbide layer electrolytically or, preferably, by a non-electrical chemicallyreducing deposition from an appropriate solution.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES0110437 | 1967-06-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1170880A true GB1170880A (en) | 1969-11-19 |
Family
ID=7530233
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2933568A Expired GB1170880A (en) | 1967-06-21 | 1968-06-20 | Improvements in or relating to thorium-film thermionic cathodes for electrical discharge vessels. |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE1614541A1 (en) |
| FR (1) | FR1569373A (en) |
| GB (1) | GB1170880A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4114487A1 (en) * | 1991-05-03 | 1992-11-05 | Wilhelm Dr Ing Ziegenbein | High-output hot cathode for electronic appts. - has tantalum@ support to which tungsten-thorium pieces are applied |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH582951A5 (en) * | 1973-07-09 | 1976-12-15 | Bbc Brown Boveri & Cie | |
| DE4305558A1 (en) * | 1993-02-24 | 1994-08-25 | Asea Brown Boveri | Process for the manufacture of wires which are especially suitable for cathodes of electron tubes |
-
1967
- 1967-06-21 DE DE19671614541 patent/DE1614541A1/en active Pending
-
1968
- 1968-06-19 FR FR1569373D patent/FR1569373A/fr not_active Expired
- 1968-06-20 GB GB2933568A patent/GB1170880A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4114487A1 (en) * | 1991-05-03 | 1992-11-05 | Wilhelm Dr Ing Ziegenbein | High-output hot cathode for electronic appts. - has tantalum@ support to which tungsten-thorium pieces are applied |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1614541A1 (en) | 1970-08-20 |
| FR1569373A (en) | 1969-05-30 |
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