GB1019688A - Thermionic cathodes - Google Patents

Thermionic cathodes

Info

Publication number
GB1019688A
GB1019688A GB4128164A GB4128164A GB1019688A GB 1019688 A GB1019688 A GB 1019688A GB 4128164 A GB4128164 A GB 4128164A GB 4128164 A GB4128164 A GB 4128164A GB 1019688 A GB1019688 A GB 1019688A
Authority
GB
United Kingdom
Prior art keywords
matrix
nickel
cathode
solution
mins
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
GB4128164A
Inventor
Bernard Thompson
John Edward Milne
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
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB4128164A priority Critical patent/GB1019688A/en
Priority to CH1377365A priority patent/CH480729A/en
Priority to DE1965J0029134 priority patent/DE1236662B/en
Priority to FR34284A priority patent/FR1452968A/en
Priority to NL6513046A priority patent/NL6513046A/xx
Publication of GB1019688A publication Critical patent/GB1019688A/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
    • H01J9/047—Cathodes having impregnated bodies
    • 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

Landscapes

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

Abstract

1,019,688. Thermionic cathodes. STANDARD TELEPHONES & CABLES Ltd. Oct. 9, 1964, No. 41281/64. Heading H1D. During manufacture of a thermionic cathode comprising a matrix in the form of a sintered coating of nickel powder impregnated with alkaline earth emissive material, activator metal, e.g. V, Cr, Mn or W, is introduced into the matrix by impregnating the matrix with a solution of a compound of the activator metal. In particular, a nickel cathode sleeve may be sprayed with a suspension of carbonyl nickel of particle size about 3 microns in a solution of nitrocellulose in ethyl carbonate, and fired in wet hydrogen at 950‹ C. for 15 mins. to form a matrix about 0À003 inch thick and having about 70% by volume of pores. The matrix is then impregnated with an aqueous solution of ammonium tungstate and dried at 100‹ C., this step being repeated 4 times to provide a tungsten content of 1 to 10% by weight of nickel in the matrix. The tungstate is reduced to tungsten by stoving in dry hydrogen at 1000‹ C. for 20 mins. Finally, an equimolar triple carbonate, suspended in methylated spirits, is applied by brushing, and the cathode is lacquered with nitrocellulose prior to its assembly into a valve and activation.
GB4128164A 1964-10-09 1964-10-09 Thermionic cathodes Expired GB1019688A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB4128164A GB1019688A (en) 1964-10-09 1964-10-09 Thermionic cathodes
CH1377365A CH480729A (en) 1964-10-09 1965-10-06 Method of manufacturing a hot cathode
DE1965J0029134 DE1236662B (en) 1964-10-09 1965-10-06 Method of manufacturing a supply cathode
FR34284A FR1452968A (en) 1964-10-09 1965-10-08 Method of manufacturing cathodes for thermionic tubes
NL6513046A NL6513046A (en) 1964-10-09 1965-10-08

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4128164A GB1019688A (en) 1964-10-09 1964-10-09 Thermionic cathodes

Publications (1)

Publication Number Publication Date
GB1019688A true GB1019688A (en) 1966-02-09

Family

ID=10418968

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4128164A Expired GB1019688A (en) 1964-10-09 1964-10-09 Thermionic cathodes

Country Status (4)

Country Link
CH (1) CH480729A (en)
DE (1) DE1236662B (en)
GB (1) GB1019688A (en)
NL (1) NL6513046A (en)

Also Published As

Publication number Publication date
NL6513046A (en) 1966-04-12
DE1236662B (en) 1967-03-16
CH480729A (en) 1969-10-31

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