GB888321A - Improvements in or relating to thermionic cathodes - Google Patents

Improvements in or relating to thermionic cathodes

Info

Publication number
GB888321A
GB888321A GB4060959A GB4060959A GB888321A GB 888321 A GB888321 A GB 888321A GB 4060959 A GB4060959 A GB 4060959A GB 4060959 A GB4060959 A GB 4060959A GB 888321 A GB888321 A GB 888321A
Authority
GB
United Kingdom
Prior art keywords
cathode
mesh
welded
supports
nickel
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
GB4060959A
Inventor
Anthony George Goss
Thomas Michael Goss
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.)
MO Valve Co Ltd
Original Assignee
MO 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 MO Valve Co Ltd filed Critical MO Valve Co Ltd
Priority to GB4060959A priority Critical patent/GB888321A/en
Publication of GB888321A publication Critical patent/GB888321A/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
    • H01J1/28—Dispenser-type cathodes, e.g. L-cathode

Landscapes

  • Microwave Tubes (AREA)

Abstract

888,321. Cathodes. M-O VALVE CO. Ltd. Nov. 21, 1960 [Nov. 30, 1959], No. 40609/59. Class 39(1) A thermionic cathode includes a wire mesh 11 mounted on and in good thermal contact with a sheet metal base 1, the mesh being embedded in a porous layer 12 of sintered metallic powder the pores of which are loaded with a thermionically emissive material. As shown, the tubular cathode is mounted in a magnetron, intended for pulsed operation, by means of ceramic plugs 2 in molybdenum cups 4 welded to molybdenum discs 5, which have tags 6 welded to tungsten supports 7. The supports 7 also supply current to the heater 8, the cathode tube 1 being connected to one of these supports by a metal strip 10. In manufacture of the cathode, the nickel mesh 11 is first tack-welded and then sintered to the nickel tube 1. The porous layer 12 is formed by applying a suspension of fine nickel powder in amyl acetate with a nitrocellulose binder to the mesh 11 and sintering, further layers being applied, if necessary. Finally, the layer 12 is painted with a suspension of Carium and strontium carbonates in a suitable binder, activation of the cathode being effected during outgassing of the magnetron. Suitable cathode dimensions and sintering temperatures are given.
GB4060959A 1959-11-30 1959-11-30 Improvements in or relating to thermionic cathodes Expired GB888321A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4060959A GB888321A (en) 1959-11-30 1959-11-30 Improvements in or relating to thermionic cathodes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4060959A GB888321A (en) 1959-11-30 1959-11-30 Improvements in or relating to thermionic cathodes

Publications (1)

Publication Number Publication Date
GB888321A true GB888321A (en) 1962-01-31

Family

ID=10415737

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4060959A Expired GB888321A (en) 1959-11-30 1959-11-30 Improvements in or relating to thermionic cathodes

Country Status (1)

Country Link
GB (1) GB888321A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2259181A (en) * 1991-08-30 1993-03-03 Eev Ltd Magnetron

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2259181A (en) * 1991-08-30 1993-03-03 Eev Ltd Magnetron
GB2259181B (en) * 1991-08-30 1995-06-21 Eev Ltd Magnetron

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