GB1017004A - Electron discharge devices - Google Patents

Electron discharge devices

Info

Publication number
GB1017004A
GB1017004A GB37877/63A GB3787763A GB1017004A GB 1017004 A GB1017004 A GB 1017004A GB 37877/63 A GB37877/63 A GB 37877/63A GB 3787763 A GB3787763 A GB 3787763A GB 1017004 A GB1017004 A GB 1017004A
Authority
GB
United Kingdom
Prior art keywords
tungsten
layer
wire
coating
produce
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
Application number
GB37877/63A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CBS Corp
Original Assignee
Westinghouse Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Publication of GB1017004A publication Critical patent/GB1017004A/en
Expired legal-status Critical Current

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
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
    • H01J1/22—Heaters

Landscapes

  • Solid Thermionic Cathode (AREA)

Abstract

1,017,004. Coated wire. WESTINGHOUSE ELECTRIC CORPORATION. Sept. 26, 1963 [Oct. 2, 1962], No. 37877/63. Heading B2B. [Also in Division H5] A heater for an indirectly heated cathode comprises wire 40, e.g. of tungsten, coated with a plurality of insulating layers 41-47 of aluminium oxide, the outer layer also containing 40% powdered tungsten, to produce a dark surface. The layers are applied by passing the wire an appropriate number of times through a slurry comprising powdered aluminium oxide, aluminium nitrate and deionized water, with methanol as a wetting agent. Each pass is followed by heating at 700-800 ‹C. to drive off the water and nitrate, to produce a layer about 0.5 mils thick. The final layer, containing the tungsten, is applied by coating from a suspension agitated by bubbling a gas through it and following the normal heating the coating is sintered in a hydrogen furnace at 800-1100 ‹C. It is stated that more than one tungsten containing layer may be used. Reference has been directed by the Comptrotter to Specification 922,440.
GB37877/63A 1962-10-02 1963-09-26 Electron discharge devices Expired GB1017004A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US227801A US3246197A (en) 1962-10-02 1962-10-02 Cathode heater having an aluminum oxide and tungesten coating

Publications (1)

Publication Number Publication Date
GB1017004A true GB1017004A (en) 1966-01-12

Family

ID=22854521

Family Applications (1)

Application Number Title Priority Date Filing Date
GB37877/63A Expired GB1017004A (en) 1962-10-02 1963-09-26 Electron discharge devices

Country Status (2)

Country Link
US (1) US3246197A (en)
GB (1) GB1017004A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4231900A (en) * 1973-05-24 1980-11-04 Nissan Motor Company, Limited Method for forming activated alumina coating on refractory article and article thereby produced

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3737714A (en) * 1964-12-18 1973-06-05 Sylvania Electric Prod Dark coated heater for vacuum tube cathode
US3852105A (en) * 1972-04-07 1974-12-03 Rca Corp Fabrication of dark heaters
DE2317445C3 (en) * 1973-04-06 1982-09-09 Standard Elektrik Lorenz Ag, 7000 Stuttgart Method for manufacturing a heater for an indirectly heated cathode
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
US4540604A (en) * 1983-08-25 1985-09-10 E. I. Du Pont De Nemours And Company Thick film conductor compositions
US4514321A (en) * 1983-08-25 1985-04-30 E. I. Du Pont De Nemours And Company Thick film conductor compositions
CN110676137B (en) * 2019-09-16 2022-05-27 九江学院 Preparation method of cathode for magnetron

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE364329A (en) * 1928-10-11
US2092815A (en) * 1935-11-23 1937-09-14 Rca Corp Cathode heater insulation
US3001893A (en) * 1958-03-25 1961-09-26 Emi Ltd Formation of firmly adherent coatings of refractory materials on metals
US3029360A (en) * 1958-04-29 1962-04-10 Rca Corp Heater wire coating process
US2987423A (en) * 1958-09-26 1961-06-06 Rca Corp Heat radiating coatings
DE1090774B (en) * 1959-03-20 1960-10-13 Siemens Ag Heating element for indirectly heated cathodes and process for the production of an insulating coating
SU136823A1 (en) * 1960-06-23 1960-11-30 О.К. Култашев Cathode for vacuum devices
NL268393A (en) * 1960-08-19
NL125415C (en) * 1961-03-13
DE1133835B (en) * 1961-12-16 1962-07-26 Telefunken Patent Process for the production of an indirectly heated cathode for an electrical discharge tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4231900A (en) * 1973-05-24 1980-11-04 Nissan Motor Company, Limited Method for forming activated alumina coating on refractory article and article thereby produced

Also Published As

Publication number Publication date
US3246197A (en) 1966-04-12

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