GB1164413A - Cathode Assembly - Google Patents

Cathode Assembly

Info

Publication number
GB1164413A
GB1164413A GB565168A GB565168A GB1164413A GB 1164413 A GB1164413 A GB 1164413A GB 565168 A GB565168 A GB 565168A GB 565168 A GB565168 A GB 565168A GB 1164413 A GB1164413 A GB 1164413A
Authority
GB
United Kingdom
Prior art keywords
osmium
per cent
atom per
tungsten
dispenser cathode
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
GB565168A
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
Priority claimed from NL6701867A external-priority patent/NL154360B/en
Priority claimed from NL686800278A external-priority patent/NL154047B/en
Application filed by Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1164413A publication Critical patent/GB1164413A/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
    • H01J1/14—Solid thermionic cathodes characterised by the material
    • 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

  • Solid Thermionic Cathode (AREA)
  • Powder Metallurgy (AREA)

Abstract

1,164,413. Cathode materials and processing. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 5 Feb., 1968 [8 Feb., 1967; 9 Jan., 1968], No. 5651/68. Heading H1D. [Also in Division C7] A dispenser cathode, which contains barium compounds as activating material, comprises a porous tungsten body whose emissive surface is coated with a thin layer of an osmium-iridium alloy containing 30 to 70 atom per cent of osmium or of an osmium-ruthenium alloy containing 20 to 80 atom per cent of osmium. The alloy layer may be applied by sputtering and is preferably a few hundred to 10,000 Š thick. The dispenser cathode shown has a store 3 of emissive material comprising 60% by weight of tungsten powder and 40% by weight of bariumcalcium aluminate covered by porous tungsten plate 4 with a thin coating 5 of osmium-iridium (50-50 atom per cent) having a thickness of 2000 Š. The dispenser cathode may alternatively comprise an impregnated tungsten block. The alloy layer may be formed by sputtering in argon at 1 mm. Hg, and the cathodes may subsequently be sintered in hydrogen at 1 atm. pressure at 1350‹ C. to improve adhesion.
GB565168A 1967-02-08 1968-02-05 Cathode Assembly Expired GB1164413A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL6701867A NL154360B (en) 1967-02-08 1967-02-08 ELECTRICAL DISCHARGE TUBE WITH A CATHODE CONTAINING INSIDE ACTIVATION MATERIAL, AND CATHOD FOR SUCH DISCHARGE TUBE.
NL686800278A NL154047B (en) 1968-01-09 1968-01-09 ELECTRICAL DISCHARGE TUBE WITH A CATHODE CONTAINING INSIDE ACTIVATION MATERIAL, AND CATHOD FOR SUCH DISCHARGE TUBE.

Publications (1)

Publication Number Publication Date
GB1164413A true GB1164413A (en) 1969-09-17

Family

ID=26644145

Family Applications (1)

Application Number Title Priority Date Filing Date
GB565168A Expired GB1164413A (en) 1967-02-08 1968-02-05 Cathode Assembly

Country Status (3)

Country Link
CH (1) CH477756A (en)
FR (1) FR1555031A (en)
GB (1) GB1164413A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0004424A1 (en) * 1978-03-23 1979-10-03 Thorn Emi-Varian Limited Thermionic cathode
EP0028954A1 (en) * 1979-11-09 1981-05-20 Thomson-Csf Thermionic cathode, process for manufacturing it and electron tube incorporating such a cathode

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2822665A1 (en) * 1978-05-05 1979-11-08 Bbc Brown Boveri & Cie GLOW CATHODE MATERIAL
CH629033A5 (en) * 1978-05-05 1982-03-31 Bbc Brown Boveri & Cie GLOWH CATHODE.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0004424A1 (en) * 1978-03-23 1979-10-03 Thorn Emi-Varian Limited Thermionic cathode
EP0028954A1 (en) * 1979-11-09 1981-05-20 Thomson-Csf Thermionic cathode, process for manufacturing it and electron tube incorporating such a cathode

Also Published As

Publication number Publication date
FR1555031A (en) 1969-01-24
CH477756A (en) 1969-08-31
DE1639344B2 (en) 1976-02-12
DE1639344A1 (en) 1971-02-04

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Legal Events

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