GB1378620A - Thermionic cathode including lanthanum hexaboride - Google Patents

Thermionic cathode including lanthanum hexaboride

Info

Publication number
GB1378620A
GB1378620A GB2515673A GB2515673A GB1378620A GB 1378620 A GB1378620 A GB 1378620A GB 2515673 A GB2515673 A GB 2515673A GB 2515673 A GB2515673 A GB 2515673A GB 1378620 A GB1378620 A GB 1378620A
Authority
GB
United Kingdom
Prior art keywords
cathode
lab
heating
lanthanum hexaboride
cathode including
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
GB2515673A
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 GB1378620A publication Critical patent/GB1378620A/en
Expired legal-status Critical Current

Links

Classifications

    • 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

Abstract

1378620 Cathode materials PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 25 May 1973 [30 May 1972] 25156/73 Heading H1D [Also in Division C7] A cathode is formed by cataphoretically depositing LaB 6 on the bend of a Rh "hairpin" heater wire; gradually raising the temperature to 1500‹ C. to sinter the cathode and form smooth shiny surface; cataphoretically depositing a further layer of pure LaB 6 and heating to 1500‹ C. During sintering a barrier layer of Rh boride forms. For coating a suspension of LaB 6 in methanol is used. The cathode is activated by heating at 1500‹ C. for 5-30 minutes or by electron bombardment. The cathode is used in X-ray and rectifier À tubes, electron microscopes and electron beam welding apparatus.
GB2515673A 1972-05-30 1973-05-25 Thermionic cathode including lanthanum hexaboride Expired GB1378620A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7207275A NL167796C (en) 1972-05-30 1972-05-30 METHOD FOR MANUFACTURING A LANTHANE HEXABORIDE-ACTIVATED CATHOD FOR AN ELECTRIC DISCHARGE TUBE

Publications (1)

Publication Number Publication Date
GB1378620A true GB1378620A (en) 1974-12-27

Family

ID=19816153

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2515673A Expired GB1378620A (en) 1972-05-30 1973-05-25 Thermionic cathode including lanthanum hexaboride

Country Status (9)

Country Link
US (1) US3833494A (en)
JP (1) JPS5524224B2 (en)
CA (1) CA994280A (en)
CH (1) CH574677A5 (en)
DE (1) DE2325273C3 (en)
FR (1) FR2186725B1 (en)
GB (1) GB1378620A (en)
NL (1) NL167796C (en)
SE (1) SE382886B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2117795A (en) * 1982-04-06 1983-10-19 Standard Telephones Cables Ltd Fabricating capacitors; forming ceramic films
US4810925A (en) * 1986-05-16 1989-03-07 English Electric Valve Company Limited Directly heated cathodes
US9824666B2 (en) 2014-09-26 2017-11-21 Boe Technology Group Co., Ltd. Smart bracelet display control system and smart bracelet

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5128475A (en) * 1974-09-04 1976-03-10 Hitachi Ltd MAGUNETORONINKYOKUKOTAI
US4019081A (en) * 1974-10-25 1977-04-19 Bbc Brown Boveri & Company Limited Reaction cathode
JPS6040133B2 (en) * 1975-04-10 1985-09-09 科学技術庁無機材質研究所長 Manufacturing method of cathode for thermionic emission
US4055780A (en) * 1975-04-10 1977-10-25 National Institute For Researches In Inorganic Materials Thermionic emission cathode having a tip of a single crystal of lanthanum hexaboride
JPS5231651A (en) * 1975-09-04 1977-03-10 Natl Inst For Res In Inorg Mater Scan-type electron microscope
JPS5231652A (en) * 1975-09-04 1977-03-10 Natl Inst For Res In Inorg Mater Electron microscope
US4054946A (en) * 1976-09-28 1977-10-18 Bell Telephone Laboratories, Incorporated Electron source of a single crystal of lanthanum hexaboride emitting surface of (110) crystal plane
JPS57196443A (en) * 1981-05-29 1982-12-02 Denki Kagaku Kogyo Kk Manufacture of hot cathode
JPS6489242A (en) * 1987-09-30 1989-04-03 Mitsubishi Electric Corp Electrode for discharge light source
DE4026297A1 (en) * 1990-08-20 1992-02-27 Siemens Ag X=ray tube system - has heater for cathode contg. lanthanum material as electron emitter
DE4026298A1 (en) * 1990-08-20 1992-02-27 Siemens Ag Long life X=ray tube - has electron emitter based on rare earth material alloy
DE4026299A1 (en) * 1990-08-20 1992-02-27 Siemens Ag X-RAY ARRANGEMENT WITH AN X-RAY EMITTER
DE4026301A1 (en) * 1990-08-20 1992-02-27 Siemens Ag ELECTRON EMITTER OF A X-RAY TUBE
DE4026300A1 (en) * 1990-08-20 1992-02-27 Siemens Ag Electron emitter for X=ray tube - is of material contg. rare earth element covering support layer of large flat surface withstanding vibration
DE10245392B3 (en) * 2002-09-28 2004-01-08 Vtd Vakuumtechnik Dresden Gmbh Tubular hollow cathode for high electrical outputs
JP4951477B2 (en) * 2006-12-04 2012-06-13 電気化学工業株式会社 Electron emission source
EP1983546A1 (en) * 2007-04-20 2008-10-22 PANalytical B.V. X-ray cathode and tube
US8952605B2 (en) * 2012-07-03 2015-02-10 National Institute For Materials Science Metal hexaboride cold field emitter, method of fabricating same, and electron gun

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3312856A (en) * 1963-03-26 1967-04-04 Gen Electric Rhenium supported metallic boride cathode emitters
US3498897A (en) * 1967-07-25 1970-03-03 Ford Motor Co Method for manufacturing multilayered product
US3630770A (en) * 1969-04-30 1971-12-28 Gen Electric Method for fabricating lanthanum boride cathodes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2117795A (en) * 1982-04-06 1983-10-19 Standard Telephones Cables Ltd Fabricating capacitors; forming ceramic films
US4810925A (en) * 1986-05-16 1989-03-07 English Electric Valve Company Limited Directly heated cathodes
US9824666B2 (en) 2014-09-26 2017-11-21 Boe Technology Group Co., Ltd. Smart bracelet display control system and smart bracelet

Also Published As

Publication number Publication date
DE2325273C3 (en) 1981-07-09
NL167796B (en) 1981-08-17
NL7207275A (en) 1973-12-04
FR2186725B1 (en) 1976-09-17
CA994280A (en) 1976-08-03
JPS5524224B2 (en) 1980-06-27
CH574677A5 (en) 1976-04-15
DE2325273A1 (en) 1973-12-13
FR2186725A1 (en) 1974-01-11
DE2325273B2 (en) 1980-09-04
SE382886B (en) 1976-02-16
NL167796C (en) 1982-01-18
JPS4944661A (en) 1974-04-26
US3833494A (en) 1974-09-03

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee