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SE320437B - - Google Patents

Info

Publication number
SE320437B
SE320437B SE6079/65A SE607965A SE320437B SE 320437 B SE320437 B SE 320437B SE 6079/65 A SE6079/65 A SE 6079/65A SE 607965 A SE607965 A SE 607965A SE 320437 B SE320437 B SE 320437B
Authority
SE
Sweden
Prior art keywords
tungsten
molybdenum
aluminate
spacers
filled
Prior art date
Application number
SE6079/65A
Inventor
B Cooper
Original Assignee
English Electric Valve Co 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 English Electric Valve Co Ltd filed Critical English Electric Valve Co Ltd
Publication of SE320437B publication Critical patent/SE320437B/xx

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/02—Electrodes; Magnetic control means; Screens
    • H01J23/04—Cathodes
    • H01J23/05—Cathodes having a cylindrical emissive surface, e.g. cathodes for magnetrons
    • 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
    • H01J1/28—Dispenser-type cathodes, e.g. L-cathode
    • 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)
  • Microwave Tubes (AREA)
  • Powder Metallurgy (AREA)

Abstract

1,023,598. Cathodes. ENGLISH ELECTRIC VALVE CO. Ltd. Feb. 12, 1965 [May 11, 1964], No. 19505/64. Heading H1D. A magnetron cathode comprises a stack of tungsten or molybdenum rings 2, alternating with spacers 3 of the same material, to leave gaps 4 which are filled with a mixture consisting of at least 50% by volume of barium-calcium aluminate. During manufacture the rings 2 and spacers 3 are assembled on a tube 1 and clamped or brazed together. This assembly is then brought into contact with a molten mixture consisting, by weight, of 40% aluminate and 60% tungsten or molybdenum powder, so that the gaps 4 are filled by capillary action. The ratio of aluminate to tungsten or molybdenum in the working surface of the cathode isat least unity for goodsecondary emission.
SE6079/65A 1964-05-11 1965-05-10 SE320437B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB19505/64A GB1023598A (en) 1964-05-11 1964-05-11 Improvements in or relating to magnetron cathodes

Publications (1)

Publication Number Publication Date
SE320437B true SE320437B (en) 1970-02-09

Family

ID=10130478

Family Applications (1)

Application Number Title Priority Date Filing Date
SE6079/65A SE320437B (en) 1964-05-11 1965-05-10

Country Status (6)

Country Link
US (1) US3441781A (en)
CH (1) CH421312A (en)
DE (1) DE1491342B1 (en)
GB (1) GB1023598A (en)
NL (1) NL6505936A (en)
SE (1) SE320437B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3501617A (en) * 1967-11-24 1970-03-17 Chicago Bridge & Iron Co Apparatus for sublimating and evaporating metals
GB2214704B (en) * 1988-01-20 1992-05-06 English Electric Valve Co Ltd Magnetrons
RU2007777C1 (en) * 1992-04-15 1994-02-15 Предприятие "Плутон" Magnetron

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1891074A (en) * 1931-02-19 1932-12-13 Gen Electric Cathode for electric discharge devices
US3201639A (en) * 1955-02-09 1965-08-17 Philips Corp Thermionic dispenser cathode
US3160780A (en) * 1961-01-17 1964-12-08 Philips Corp Indirectly heated cathode
FR1307503A (en) * 1961-01-23 1962-10-26 S F D Lab Method for interrupting the operation of an electronic cross-field device
US3210575A (en) * 1961-03-07 1965-10-05 Podolsky Leon Thermoelectron engine having composite emitter

Also Published As

Publication number Publication date
DE1491342B1 (en) 1969-11-13
NL6505936A (en) 1965-11-12
CH421312A (en) 1966-09-30
GB1023598A (en) 1966-03-23
US3441781A (en) 1969-04-29

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