GB1015272A - Incandescent cathode for electronic valves and process for producing same - Google Patents
Incandescent cathode for electronic valves and process for producing sameInfo
- Publication number
- GB1015272A GB1015272A GB3770963A GB3770963A GB1015272A GB 1015272 A GB1015272 A GB 1015272A GB 3770963 A GB3770963 A GB 3770963A GB 3770963 A GB3770963 A GB 3770963A GB 1015272 A GB1015272 A GB 1015272A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tungsten
- layer
- thorium oxide
- coating
- thoriated
- 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
-
- 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
1,015,272. Cathode materials and processing. "PATELHOLD" PATENTVER WERTUNGS- & ELEKTRO HOLDING A.G. Sept. 25, 1963 [Sept. 27, 1962], No. 37709/63. Heading H1D. An incandescent cathode includes a support of tantalum, molybdenum, or tungsten/rhenium alloy, having an emissive coating containing tungsten, carbon, and thorium oxide, the coating having a mean grain size of approximately 1 Á, and containing not more than 2% of thorium oxide. The coating applied to the support may be separated from it by a galvanically applied diffusion-inhibiting layer of rhenium, and may consist of tungsten carbide containing thorium oxide, or a mixture of tungsten carbide and thoriated tungsten, or a layer of thoriated tungsten covered by a layer of tungsten carbide containing thorium oxide, or a layer of thoriated tungsten or thoriated tungsten/tungsten carbide mixture covered by a layer of carburized thoriated tungsten. The coating is applied, as a powder of grain diameter about 1 Á, by spraying, brushing, dipping, or electrophoresis from solution, and is subsequently melted or sintered in vacuum and, after incorporation in a discharge tube, activated by heat treatment. The applied powder may alternatively contain thorium nitrate and sugar, which yields thorium oxide and carbon upon heating.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH1142262A CH403090A (en) | 1962-09-27 | 1962-09-27 | Hot cathode for electron tubes and process for their manufacture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1015272A true GB1015272A (en) | 1965-12-31 |
Family
ID=4373329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3770963A Expired GB1015272A (en) | 1962-09-27 | 1963-09-25 | Incandescent cathode for electronic valves and process for producing same |
Country Status (4)
| Country | Link |
|---|---|
| CH (1) | CH403090A (en) |
| FR (1) | FR1370363A (en) |
| GB (1) | GB1015272A (en) |
| NL (1) | NL298401A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2018017A (en) * | 1978-03-31 | 1979-10-10 | Hitachi Ltd | Cathode base alloy materials |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7795792B2 (en) * | 2006-02-08 | 2010-09-14 | Varian Medical Systems, Inc. | Cathode structures for X-ray tubes |
-
1962
- 1962-09-27 CH CH1142262A patent/CH403090A/en unknown
-
1963
- 1963-09-25 NL NL298401D patent/NL298401A/xx unknown
- 1963-09-25 FR FR44028A patent/FR1370363A/en not_active Expired
- 1963-09-25 GB GB3770963A patent/GB1015272A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2018017A (en) * | 1978-03-31 | 1979-10-10 | Hitachi Ltd | Cathode base alloy materials |
Also Published As
| Publication number | Publication date |
|---|---|
| CH403090A (en) | 1965-11-30 |
| NL298401A (en) | 1965-11-25 |
| FR1370363A (en) | 1964-08-21 |
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