GB922440A - Cathode heater for electron discharge devices - Google Patents
Cathode heater for electron discharge devicesInfo
- Publication number
- GB922440A GB922440A GB26618/61A GB2661861A GB922440A GB 922440 A GB922440 A GB 922440A GB 26618/61 A GB26618/61 A GB 26618/61A GB 2661861 A GB2661861 A GB 2661861A GB 922440 A GB922440 A GB 922440A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coating
- aluminium oxide
- mixture
- tungsten
- insulating coating
- 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
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 18
- 239000011248 coating agent Substances 0.000 abstract 8
- 238000000576 coating method Methods 0.000 abstract 8
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 abstract 3
- 239000000203 mixture Substances 0.000 abstract 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 abstract 3
- SWXVUIWOUIDPGS-UHFFFAOYSA-N diacetone alcohol Chemical compound CC(=O)CC(C)(C)O SWXVUIWOUIDPGS-UHFFFAOYSA-N 0.000 abstract 2
- HFLAMWCKUFHSAZ-UHFFFAOYSA-N niobium dioxide Chemical compound O=[Nb]=O HFLAMWCKUFHSAZ-UHFFFAOYSA-N 0.000 abstract 2
- 229910052721 tungsten Inorganic materials 0.000 abstract 2
- 239000010937 tungsten Substances 0.000 abstract 2
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 abstract 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 abstract 1
- 239000000020 Nitrocellulose Substances 0.000 abstract 1
- 229910021541 Vanadium(III) oxide Inorganic materials 0.000 abstract 1
- 239000011230 binding agent Substances 0.000 abstract 1
- 239000010419 fine particle Substances 0.000 abstract 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 abstract 1
- 229910052739 hydrogen Inorganic materials 0.000 abstract 1
- 239000001257 hydrogen Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- NFFIWVVINABMKP-UHFFFAOYSA-N methylidynetantalum Chemical compound [Ta]#C NFFIWVVINABMKP-UHFFFAOYSA-N 0.000 abstract 1
- 229910052750 molybdenum Inorganic materials 0.000 abstract 1
- 239000011733 molybdenum Substances 0.000 abstract 1
- 229920001220 nitrocellulos Polymers 0.000 abstract 1
- 238000002360 preparation method Methods 0.000 abstract 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 abstract 1
- 229910010271 silicon carbide Inorganic materials 0.000 abstract 1
- 238000005507 spraying Methods 0.000 abstract 1
- 229910003468 tantalcarbide Inorganic materials 0.000 abstract 1
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 abstract 1
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
- H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
- H01J1/22—Heaters
Landscapes
- Solid Thermionic Cathode (AREA)
Abstract
922,440. Cathode heaters. RADIO CORPORATION OF AMERICA. July 21, 1961 [Aug. 19, 1960], No. 26618/61. Class 39 (3). A cathode heater for indirectly heated cathodes comprises a base wire 13 having an insulating coating 23 thereon, and a second coating 23, over said insulating coating, comprised of a mixture of aluminium oxide and material having a greater thermal radiant emissivity than aluminium oxide. The insulating coating preferably consists of aluminium oxide and the second coating a mixture of fine particles of metallic tungsten, molybdenum, silicon carbide, tungsten carbide, tantalum carbide, vanadium sesquioxide and/or niobium dioxide with 50% by weight of aluminium oxide. The layers are preferably formed by spraying; alternatively, drag coating or cataphoretic coating may be used. In a specific example for the preparation of the second coating, 10 gms. of aluminium oxide was mixed with 50 c.c. of ammonium tungstate solution, allowed to dry and fired in a hydrogen atmosphere for 1 hour at 1000 C., and 108 gm. of the resulting aluminium oxide/tungsten mixture ball milled for 30 mins. with 100 c.cs. methanol and 200 c.cs. of a binder comprising 64.5 gms. nitrocellulose, 1455 c.cs. butyl acetate and 1355 c.cs. diacetone alcohol.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US50706A US3195004A (en) | 1960-08-19 | 1960-08-19 | Cathode heater for electron discharge devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB922440A true GB922440A (en) | 1963-04-03 |
Family
ID=21966900
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB26618/61A Expired GB922440A (en) | 1960-08-19 | 1961-07-21 | Cathode heater for electron discharge devices |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US3195004A (en) |
| DE (1) | DE1141388B (en) |
| ES (1) | ES269986A1 (en) |
| GB (1) | GB922440A (en) |
| NL (1) | NL268393A (en) |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3246197A (en) * | 1962-10-02 | 1966-04-12 | Westinghouse Electric Corp | Cathode heater having an aluminum oxide and tungesten coating |
| FR1355710A (en) * | 1963-02-06 | 1964-03-20 | Radiotechnique | Further development of cathode heating filaments for electron tubes |
| DE1281039B (en) * | 1963-09-25 | 1968-10-24 | Telefunken Patent | Process for the production of an indirectly heated cathode for electron tubes |
| FR1398135A (en) * | 1964-03-27 | 1965-05-07 | Commissariat Energie Atomique | Process for stabilizing thermionic sources and thermionic source in accordance with those obtained by applying said process or a similar process |
| US3328201A (en) * | 1964-04-27 | 1967-06-27 | Rca Corp | Heater for electron tubes |
| US3450565A (en) * | 1964-12-18 | 1969-06-17 | Sylvania Electric Prod | Method of coating heater coils |
| US3737714A (en) * | 1964-12-18 | 1973-06-05 | Sylvania Electric Prod | Dark coated heater for vacuum tube cathode |
| GB1129615A (en) * | 1965-03-11 | 1968-10-09 | English Electric Valve Co Ltd | Improvements in or relating to electron discharge device cathodes |
| US3401297A (en) * | 1965-08-23 | 1968-09-10 | Varian Associates | Thermionic cathodes for electron discharge devices with improved refractory metal heater wires |
| NL6512348A (en) * | 1965-09-23 | 1967-03-28 | ||
| US3494779A (en) * | 1965-09-29 | 1970-02-10 | Ncr Co | Oxygen-dominated phosphor films |
| DE1639016B1 (en) * | 1967-03-07 | 1972-05-31 | Varian Associates | METHOD OF MANUFACTURING CATHODE HEATERS |
| US3500454A (en) * | 1967-11-16 | 1970-03-10 | Sylvania Electric Prod | Insulator heater coating for heater-cathode assembly |
| DE2317446C3 (en) * | 1973-04-06 | 1983-11-10 | Standard Elektrik Lorenz Ag, 7000 Stuttgart | Method of manufacturing a heating element for an indirectly heated cathode |
| DE2317445C3 (en) * | 1973-04-06 | 1982-09-09 | Standard Elektrik Lorenz Ag, 7000 Stuttgart | Method for manufacturing a heater for an indirectly heated cathode |
| US4126489A (en) * | 1973-07-17 | 1978-11-21 | Varian Associates, Inc. | Method of making cathode heaters |
| JPS5165861A (en) * | 1974-12-05 | 1976-06-07 | Sony Corp | Toranjisutano baiasukairo |
| US10741351B1 (en) * | 2019-08-01 | 2020-08-11 | Lockheed Martin Corporation | Multi-apertured conduction heater |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE403333A (en) * | 1933-06-24 | |||
| US2724788A (en) * | 1952-02-12 | 1955-11-22 | Electrons Inc | Indirectly heated cathode for gas tubes |
| US3029360A (en) * | 1958-04-29 | 1962-04-10 | Rca Corp | Heater wire coating process |
| US3005926A (en) * | 1959-05-22 | 1961-10-24 | Westinghouse Electric Corp | Cathode for electron discharge device |
| NL250741A (en) * | 1959-07-16 |
-
0
- NL NL268393D patent/NL268393A/xx unknown
-
1960
- 1960-08-19 US US50706A patent/US3195004A/en not_active Expired - Lifetime
-
1961
- 1961-07-18 DE DER30772A patent/DE1141388B/en active Pending
- 1961-07-21 GB GB26618/61A patent/GB922440A/en not_active Expired
- 1961-08-18 ES ES0269986A patent/ES269986A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ES269986A1 (en) | 1961-11-16 |
| US3195004A (en) | 1965-07-13 |
| NL268393A (en) | |
| DE1141388B (en) | 1962-12-20 |
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