GB2012103A - Activation of cathodes - Google Patents

Activation of cathodes

Info

Publication number
GB2012103A
GB2012103A GB7844332A GB7844332A GB2012103A GB 2012103 A GB2012103 A GB 2012103A GB 7844332 A GB7844332 A GB 7844332A GB 7844332 A GB7844332 A GB 7844332A GB 2012103 A GB2012103 A GB 2012103A
Authority
GB
United Kingdom
Prior art keywords
support
tubes
activator element
activator
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.)
Granted
Application number
GB7844332A
Other versions
GB2012103B (en
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Priority to GB7844332A priority Critical patent/GB2012103B/en
Priority to CA000317186A priority patent/CA1139827A/en
Priority to IT3047878A priority patent/IT1101677B/en
Priority to JP14959278A priority patent/JPS54100249A/en
Priority to DE19782852356 priority patent/DE2852356C2/en
Priority to FR7834363A priority patent/FR2411483A1/en
Publication of GB2012103A publication Critical patent/GB2012103A/en
Application granted granted Critical
Publication of GB2012103B publication Critical patent/GB2012103B/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/0433—Nickel- or cobalt-based alloys
    • 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
    • H01J1/14—Solid thermionic cathodes characterised by the 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
    • H01J9/042—Manufacture, activation of the emissive part

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Solid Thermionic Cathode (AREA)

Abstract

Oxide cathodes, suitable for use, for example, in electron tubes, display tubes, T.V. camera tubes, transmitting tubes, klystrons and magnetrons, and comprising a cathode support 1 consisting substantially of powder metallurgical nickel containing an activator element 7 capable of reducing an emissive coating 4 present on the support 1, this coating 4 consisting of a compound of at least one alkaline earth metal and oxygen, are fabricated so that the activator element 7 is distributed inhomogeneously throughout the support 1 and forms islands having a high concentration of the activator element in the surface of the support 1. The activator element may consist of Al, C, Mg, Si or Zr. In an example the activator comprises Mg in the form of lumps of Mg-Ni alloy which are coated with Ni and these coated particles 7 are then mixed with the other powders for forming into the cathode support 1. <IMAGE>
GB7844332A 1977-12-06 1978-11-14 Oxide cathode Expired GB2012103B (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
GB7844332A GB2012103B (en) 1977-12-06 1978-11-14 Oxide cathode
CA000317186A CA1139827A (en) 1977-12-06 1978-11-30 Oxide cathode and method of manufacturing powder metallurgical nickel for such a cathode
IT3047878A IT1101677B (en) 1977-12-06 1978-12-01 OXIDE CATHODE AND METALLURGIC NICKEL PRODUCTION METHOD IN POWDER FOR SUCH CATHODE
JP14959278A JPS54100249A (en) 1977-12-06 1978-12-02 Oxide cathode and method of producing same
DE19782852356 DE2852356C2 (en) 1977-12-06 1978-12-04 Oxide cathode, use of this oxide cathode and method for producing a cathode support for such an oxide cathode
FR7834363A FR2411483A1 (en) 1977-12-06 1978-12-06 Oxide cathode with powder metallurgical nickel support - contg. reducing agent in inlets on surface is resistant to poisoning (BE 5.6.79)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB5072377 1977-12-06
GB7844332A GB2012103B (en) 1977-12-06 1978-11-14 Oxide cathode

Publications (2)

Publication Number Publication Date
GB2012103A true GB2012103A (en) 1979-07-18
GB2012103B GB2012103B (en) 1982-05-12

Family

ID=26266723

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7844332A Expired GB2012103B (en) 1977-12-06 1978-11-14 Oxide cathode

Country Status (1)

Country Link
GB (1) GB2012103B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3819852A1 (en) * 1987-06-12 1988-12-22 Mitsubishi Metal Corp CATHODE FOR AN ELECTRON TUBE
FR2808377A1 (en) * 2000-04-26 2001-11-02 Thomson Tubes & Displays OXIDE CATHODE FOR CATHODE RAY TUBE

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3819852A1 (en) * 1987-06-12 1988-12-22 Mitsubishi Metal Corp CATHODE FOR AN ELECTRON TUBE
US4980603A (en) * 1987-06-12 1990-12-25 Mitsubishi Kinzoku Kabushiki Kaisha Cathode for an electron tube
FR2808377A1 (en) * 2000-04-26 2001-11-02 Thomson Tubes & Displays OXIDE CATHODE FOR CATHODE RAY TUBE

Also Published As

Publication number Publication date
GB2012103B (en) 1982-05-12

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee