GB994471A - Improvements relating to indirectly heated cathodes for use in electron valves - Google Patents

Improvements relating to indirectly heated cathodes for use in electron valves

Info

Publication number
GB994471A
GB994471A GB44443/61A GB4444361A GB994471A GB 994471 A GB994471 A GB 994471A GB 44443/61 A GB44443/61 A GB 44443/61A GB 4444361 A GB4444361 A GB 4444361A GB 994471 A GB994471 A GB 994471A
Authority
GB
United Kingdom
Prior art keywords
cathode
gms
improvements relating
indirectly heated
aluminium
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
GB44443/61A
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries Ltd
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 Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB994471A publication Critical patent/GB994471A/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
    • H01J1/26—Supports for the emissive 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Solid Thermionic Cathode (AREA)
  • Powder Metallurgy (AREA)

Abstract

The inner surface of an indirectly-heated cathode is provided with a black layer obtained by the reaction of finely-divided aluminium with the metal of the cathode, which may be Ni, Mo, Fe or alloys thereof. The cathode may be coated with a suspension of 20 gms. of aluminium powder in a 140 mls. solution of 2,5 gms. of nitrocellulose in 75 gms. of ethyleneglycol and 22,5 gms. of butanol, or in a methylmethacrylate solution, e.g. by sucking into a tubular cathode, or by spraying or atomizing. For a nickel cathode, 5-15 gms. of nickel oxide may be added to the suspension. The coated cathode is sintered in vacuo or in a neutral or reducing atmosphere at 610-650 DEG C. for 15-30 minutes to form the black layer. Afterwards, part of the aluminium may be oxidized by sintering in a humid, reducing atmosphere at 550-600 DEG C. for 30 minutes.
GB44443/61A 1960-12-15 1961-12-12 Improvements relating to indirectly heated cathodes for use in electron valves Expired GB994471A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR847062A FR1282691A (en) 1960-12-15 1960-12-15 Further development of indirectly heated oxide cathodes for electron tubes

Publications (1)

Publication Number Publication Date
GB994471A true GB994471A (en) 1965-06-10

Family

ID=8744850

Family Applications (1)

Application Number Title Priority Date Filing Date
GB44443/61A Expired GB994471A (en) 1960-12-15 1961-12-12 Improvements relating to indirectly heated cathodes for use in electron valves

Country Status (6)

Country Link
US (1) US3262814A (en)
DE (1) DE1146207B (en)
FR (1) FR1282691A (en)
GB (1) GB994471A (en)
LU (1) LU40949A1 (en)
NL (1) NL272248A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2482139A1 (en) * 1980-05-09 1981-11-13 Philips Nv METHOD FOR MOUNTING A METAL PIECE OF A BLACK SURFACE, AND CATHODE OBTAINED BY THIS PROCESS
GB2174237A (en) * 1985-03-18 1986-10-29 Hitachi Ltd Indirectly heated cathode manufacture

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3500454A (en) * 1967-11-16 1970-03-10 Sylvania Electric Prod Insulator heater coating for heater-cathode assembly
US3958146A (en) * 1974-02-08 1976-05-18 Gte Sylvania Incorporated Fast warm up picture tube cathode cap having high heat emissivity surface on the interior thereof
US4009409A (en) * 1975-09-02 1977-02-22 Gte Sylvania Incorporated Fast warmup cathode and method of making same

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE488127A (en) * 1947-02-15 Gen Electric
BE518861A (en) * 1952-04-01
US2817572A (en) * 1954-04-06 1957-12-24 Telefunken Ges Fur Drahtlase T Electrodes for electron discharge tubes
US2891879A (en) * 1957-07-26 1959-06-23 Westinghouse Electric Corp Black coating of high thermal emissivity and process for applying the same
BE571711A (en) * 1957-10-04
US2987423A (en) * 1958-09-26 1961-06-06 Rca Corp Heat radiating coatings
US3068337A (en) * 1958-12-05 1962-12-11 Gen Electric Vaporizer and method for making the same
NL101694C (en) * 1959-03-06

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2482139A1 (en) * 1980-05-09 1981-11-13 Philips Nv METHOD FOR MOUNTING A METAL PIECE OF A BLACK SURFACE, AND CATHODE OBTAINED BY THIS PROCESS
GB2174237A (en) * 1985-03-18 1986-10-29 Hitachi Ltd Indirectly heated cathode manufacture
GB2174237B (en) * 1985-03-18 1989-10-04 Hitachi Ltd A manufacturing method of indirectly heated cathode
US5102363A (en) * 1985-03-18 1992-04-07 Hitachi, Ltd. Manufacturing method of indirectly heated cathode

Also Published As

Publication number Publication date
FR1282691A (en) 1962-01-27
US3262814A (en) 1966-07-26
DE1146207B (en) 1963-03-28
NL272248A (en)
LU40949A1 (en) 1962-02-12

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