GB616487A - Improvements in or relating to electron emission filaments - Google Patents

Improvements in or relating to electron emission filaments

Info

Publication number
GB616487A
GB616487A GB2683246A GB2683246A GB616487A GB 616487 A GB616487 A GB 616487A GB 2683246 A GB2683246 A GB 2683246A GB 2683246 A GB2683246 A GB 2683246A GB 616487 A GB616487 A GB 616487A
Authority
GB
United Kingdom
Prior art keywords
thorium
cathode
heated
mixture
carbide
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
GB2683246A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables 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
Priority to BE476381D priority Critical patent/BE476381A/xx
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB2683246A priority patent/GB616487A/en
Priority to ES179643A priority patent/ES179643A1/en
Priority to FR952894D priority patent/FR952894A/en
Publication of GB616487A publication Critical patent/GB616487A/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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
    • H01J2893/0012—Constructional arrangements
    • H01J2893/0019—Chemical composition and manufacture
    • H01J2893/0022—Manufacture
    • H01J2893/0023—Manufacture carbonising and other surface treatments

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Solid Thermionic Cathode (AREA)

Abstract

616,487. Cathode materials and processing. STANDARD TELEPHONES & CABLES, Ltd., and WOLFSON. H. Sept. 6, 1946, No. 26832. [Class 39 (i)] A method of manufacture of a cathode comprises coating the cathode with a mixture of tungsten carbide with thorium or with a material which when heated with the carbide yields thorium, and sintering the mixture. The material may be thorium, thoria or thorium hydroxide and may be applied with the tungsten carbide by electrophoresis; the mixture may be temporarily bonded by means of a binding agent such as nitrocellulose or methyl methacrylate. After the cathode has been coated it may be assembled in an electron discharge device and heated in vacuo at low temperature to drive off the binding agent; it is then heated at a high temperature to sinter the layer on to the cathode. The core may be of pure tungsten. The thorium content of the carbide layer may be 5 to 10 per cent, or more.
GB2683246A 1946-09-06 1946-09-06 Improvements in or relating to electron emission filaments Expired GB616487A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE476381D BE476381A (en) 1946-09-06
GB2683246A GB616487A (en) 1946-09-06 1946-09-06 Improvements in or relating to electron emission filaments
ES179643A ES179643A1 (en) 1946-09-06 1947-09-08 IMPROVEMENTS RELATED TO ELECTRONIC EMITTER FILAMENTS
FR952894D FR952894A (en) 1946-09-06 1947-09-11 Thoriated tungsten filaments for electronic discharge devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2683246A GB616487A (en) 1946-09-06 1946-09-06 Improvements in or relating to electron emission filaments

Publications (1)

Publication Number Publication Date
GB616487A true GB616487A (en) 1949-01-21

Family

ID=10249973

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2683246A Expired GB616487A (en) 1946-09-06 1946-09-06 Improvements in or relating to electron emission filaments

Country Status (4)

Country Link
BE (1) BE476381A (en)
ES (1) ES179643A1 (en)
FR (1) FR952894A (en)
GB (1) GB616487A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2119565A (en) * 1982-04-23 1983-11-16 Raytheon Co Method of making a cathode electrode and product of such method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2838020B2 (en) * 1978-08-31 1981-04-02 Siemens AG, 1000 Berlin und 8000 München Directly heated cathode for an electron tube with a coaxial electrode structure and process for its manufacture

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2119565A (en) * 1982-04-23 1983-11-16 Raytheon Co Method of making a cathode electrode and product of such method

Also Published As

Publication number Publication date
ES179643A1 (en) 1947-10-16
FR952894A (en) 1949-11-25
BE476381A (en)

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