GB1004776A - Improvements in cathode construction - Google Patents

Improvements in cathode construction

Info

Publication number
GB1004776A
GB1004776A GB958462A GB958462A GB1004776A GB 1004776 A GB1004776 A GB 1004776A GB 958462 A GB958462 A GB 958462A GB 958462 A GB958462 A GB 958462A GB 1004776 A GB1004776 A GB 1004776A
Authority
GB
United Kingdom
Prior art keywords
cathode
heater
march
aluminium
chromium
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
GB958462A
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Publication of GB1004776A publication Critical patent/GB1004776A/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

Landscapes

  • Solid Thermionic Cathode (AREA)

Abstract

1,004,776. Indirectly-heated cathodes. GENERAL ELECTRIC CO. March 13, 1962 [March 15, 1961], No. 9584/62. Heading H1D. [Also in Division H5] An indirectly-heated cathode comprises a nickel alloy support clad on its inner surface with an alloy of chromium, nickel and iron which has been fired in a wet hydrogen atmosphere to produce a highly heat-absorbing surface layer including an oxide of chromium. As shown, the cathode is provided with a tungsten heater coated with an insulating mixture of aluminium oxide and aluminium nitrate, and further coated with a heat-radiating layer comprising aluminium oxide, aluminium nitrate, and either 1 to 20% by weight finely-divided carbon, or 1 to 40% pulverized tungsten. The use of a conductive coating on the heater which contacts the cathode sleeve also avoids capacitance variations between cathode and heater. Cathode wall thicknesses are given, and instead of being cylindrical the cathode may be planar, cupshaped or dished.
GB958462A 1961-03-15 1962-03-13 Improvements in cathode construction Expired GB1004776A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US9593261A 1961-03-15 1961-03-15

Publications (1)

Publication Number Publication Date
GB1004776A true GB1004776A (en) 1965-09-15

Family

ID=22254253

Family Applications (1)

Application Number Title Priority Date Filing Date
GB958462A Expired GB1004776A (en) 1961-03-15 1962-03-13 Improvements in cathode construction

Country Status (2)

Country Link
DE (1) DE1147325B (en)
GB (1) GB1004776A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2174237A (en) * 1985-03-18 1986-10-29 Hitachi Ltd Indirectly heated cathode manufacture

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3581144A (en) * 1969-03-27 1971-05-25 Gen Electric Metal-clad insulated electrical heater

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE518861A (en) * 1952-04-01

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
DE1147325B (en) 1963-04-18

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