GB1131586A - Improvements relating to dispenser cathodes - Google Patents

Improvements relating to dispenser cathodes

Info

Publication number
GB1131586A
GB1131586A GB29360/67A GB2936067A GB1131586A GB 1131586 A GB1131586 A GB 1131586A GB 29360/67 A GB29360/67 A GB 29360/67A GB 2936067 A GB2936067 A GB 2936067A GB 1131586 A GB1131586 A GB 1131586A
Authority
GB
United Kingdom
Prior art keywords
mixture
powder
slurry
tungsten
weight
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
GB29360/67A
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
Application filed by Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1131586A publication Critical patent/GB1131586A/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

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

Abstract

1,131,586. Cathode materials and processing. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 26 June, 1967 [24 June, 1966], No. 29360/67. Heading H1D. A dispenser cathode emissive body is manufactured by preparing a homogeneous mixture of barium carbonate, calcium carbonate and aluminium oxide by co-precipitation from a single solution, making a slurry of the mixture and a soluble organic compound, e.g. sucrose, drying the slurry and grinding the dried slurry to form a powder, mixing the powder with a tungsten powder having a maximum particle size of less than 3 Á, then pressing the tungstencontaining mixture using a pressure of at least 20,000 kgm/sq. cm. to form a body and finally heating the body to degas the material and convert the co-precipitated mixture into an aluminate and to form a sintered body. In addition the co-precipitated mixture may be dried and the slurry prepared using a solution of the soluble organic compound. In an example the tungsten-containing mixture comprises 93% by weight W powder of particle size less than 0À5 Á, 0À2% by weight sucrose and 6À8% by weight of co-precipitated BaCO 3 , CaCO 3 and Al 2 O 3 in molar ratio of 5: 3: 2 respectively, and a pressure of at least 25,000 kgm/sq. cm. is used. The very fine tungsten particles may be prepared by the reduction of gaseous tungsten chloride with hydrogen.
GB29360/67A 1966-06-24 1967-06-26 Improvements relating to dispenser cathodes Expired GB1131586A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6608782A NL6608782A (en) 1966-06-24 1966-06-24

Publications (1)

Publication Number Publication Date
GB1131586A true GB1131586A (en) 1968-10-23

Family

ID=19796967

Family Applications (1)

Application Number Title Priority Date Filing Date
GB29360/67A Expired GB1131586A (en) 1966-06-24 1967-06-26 Improvements relating to dispenser cathodes

Country Status (8)

Country Link
US (1) US3458749A (en)
AT (1) AT270820B (en)
BE (1) BE700464A (en)
CH (1) CH489111A (en)
ES (2) ES342176A1 (en)
GB (1) GB1131586A (en)
NL (1) NL6608782A (en)
SE (1) SE318031B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2262650A (en) * 1991-12-20 1993-06-23 Samsung Electronic Devices Impregnated dispenser cathode and manufacture thereof.

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3534455A (en) * 1968-05-03 1970-10-20 Us Army Method of making thermionic cathodes
US3656020A (en) * 1970-11-18 1972-04-11 Spectra Mat Inc Thermionic cathode comprising mixture of barium oxide, calcium oxide and lithium oxide
US3760218A (en) * 1972-04-10 1973-09-18 Spectramat Inc Thermionic cathode
JPS5046058U (en) * 1973-08-27 1975-05-08
JPS5150955U (en) * 1974-10-16 1976-04-17
US4837480A (en) * 1988-03-28 1989-06-06 Hughes Aircraft Company Simplified process for fabricating dispenser cathodes
US5092805A (en) * 1988-11-11 1992-03-03 Samsung Electron Devices Co., Ltd. Manufacturing method for dispenser code
US7406268B2 (en) * 2003-08-27 2008-07-29 Avago Technologies Limited Optical receiver circuit

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE548876A (en) * 1953-08-14
US2975320A (en) * 1958-12-03 1961-03-14 Rca Corp Low-temperature plasma source
US3076916A (en) * 1959-01-21 1963-02-05 Semicon Associates Inc Impregnated tungsten cathode structures and methods for fabricating same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2262650A (en) * 1991-12-20 1993-06-23 Samsung Electronic Devices Impregnated dispenser cathode and manufacture thereof.

Also Published As

Publication number Publication date
CH489111A (en) 1970-04-15
SE318031B (en) 1969-12-01
BE700464A (en) 1967-12-27
US3458749A (en) 1969-07-29
ES342176A1 (en) 1968-10-01
AT270820B (en) 1969-05-12
ES353888A1 (en) 1969-10-01
DE1614256A1 (en) 1970-05-27
DE1614256B2 (en) 1975-09-11
NL6608782A (en) 1967-12-27

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