GB731421A - Improvements in or relating to thermionic cathodes - Google Patents

Improvements in or relating to thermionic cathodes

Info

Publication number
GB731421A
GB731421A GB109551A GB109551A GB731421A GB 731421 A GB731421 A GB 731421A GB 109551 A GB109551 A GB 109551A GB 109551 A GB109551 A GB 109551A GB 731421 A GB731421 A GB 731421A
Authority
GB
United Kingdom
Prior art keywords
carbide
tungsten
coated
mixed
thorium
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
GB109551A
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.)
DONALD ARTHUR WRIGHT
General Electric Co PLC
Original Assignee
DONALD ARTHUR WRIGHT
General Electric Co PLC
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 DONALD ARTHUR WRIGHT, General Electric Co PLC filed Critical DONALD ARTHUR WRIGHT
Priority to GB109551A priority Critical patent/GB731421A/en
Publication of GB731421A publication Critical patent/GB731421A/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
    • H01J1/148—Solid thermionic cathodes characterised by the material with compounds having metallic conductive properties, e.g. lanthanum boride, as an emissive material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/073—Main electrodes for high-pressure discharge lamps
    • H01J61/0735—Main electrodes for high-pressure discharge lamps characterised by the material of the electrode
    • H01J61/0737—Main electrodes for high-pressure discharge lamps characterised by the material of the electrode characterised by the electron emissive 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

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Discharge Lamp (AREA)

Abstract

731,421. Cathode materials and processing. GENERAL ELECTRIC CO., Ltd., and WRIGHT, D. A. Jan. 2, 1952 [Jan. 15, 1951], No. 1095/51. Class 39 (1). The electron-emissive material consists wholly or mainly of thorium carbide and is coated on a body of refractory metal of higher work function. The cathode may consist of tungsten or tantalum sheet, helix or rod coated with or containing carbide or of a sintered pellet or rod which may have recesses at the end housing the carbide. A tantalum support may be coated with tungsten or tungsten carbide or it may be carburized. Specified proportions of thorium and carbon may be mixed into a paste with a solution of nitrocellulose and applied by painting, spraying or electrophoresis and heated in a vacuum or rare gas to 1900-2000‹ K. or it may be extruded and sintered before or after it is arranged on the support. Thorium carbide may be mixed with 5-10 per cent of tungsten or tantalum which may be sintered on to the support. Operating temperatures and current emissions are specified. Two cathodes, one at each end, may be used in a high-pressure lamp containing mercury which may be mixed cadmium, zinc or thallium, or of xenon at one atmosphere. Lamp and cathode dimensions and current ratings are specified. Specification 731,422 is referred to.
GB109551A 1951-01-15 1951-01-15 Improvements in or relating to thermionic cathodes Expired GB731421A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB109551A GB731421A (en) 1951-01-15 1951-01-15 Improvements in or relating to thermionic cathodes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB109551A GB731421A (en) 1951-01-15 1951-01-15 Improvements in or relating to thermionic cathodes

Publications (1)

Publication Number Publication Date
GB731421A true GB731421A (en) 1955-06-08

Family

ID=9716065

Family Applications (1)

Application Number Title Priority Date Filing Date
GB109551A Expired GB731421A (en) 1951-01-15 1951-01-15 Improvements in or relating to thermionic cathodes

Country Status (1)

Country Link
GB (1) GB731421A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011085839A3 (en) * 2009-12-22 2011-10-20 Osram Gesellschaft mit beschränkter Haftung Ceramic electrode for a high-pressure discharge lamp
CN103578914A (en) * 2012-07-26 2014-02-12 欧司朗有限公司 High-pressure discharge lamp

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011085839A3 (en) * 2009-12-22 2011-10-20 Osram Gesellschaft mit beschränkter Haftung Ceramic electrode for a high-pressure discharge lamp
CN102668018A (en) * 2009-12-22 2012-09-12 欧司朗股份有限公司 Ceramic electrode for a high-pressure discharge lamp
US8581493B2 (en) 2009-12-22 2013-11-12 Osram Ag Ceramic electrode for a high-pressure discharge lamp
CN102668018B (en) * 2009-12-22 2016-01-13 欧司朗股份有限公司 For the ceramic electrode of high-pressure discharge lamp
CN103578914A (en) * 2012-07-26 2014-02-12 欧司朗有限公司 High-pressure discharge lamp

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