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GB1074776A - Thermionic tube cathodes - Google Patents

Thermionic tube cathodes

Info

Publication number
GB1074776A
GB1074776A GB35678/64A GB3567864A GB1074776A GB 1074776 A GB1074776 A GB 1074776A GB 35678/64 A GB35678/64 A GB 35678/64A GB 3567864 A GB3567864 A GB 3567864A GB 1074776 A GB1074776 A GB 1074776A
Authority
GB
United Kingdom
Prior art keywords
coated
nickel
oxide
stream
hours
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
GB35678/64A
Inventor
Dean William Maurer
Charles Michael Pleass
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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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 Western Electric Co Inc filed Critical Western Electric Co Inc
Publication of GB1074776A publication Critical patent/GB1074776A/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
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
    • C23C16/442—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating using fluidised bed process
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Solid Thermionic Cathode (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)

Abstract

<PICT:1074776/C6-C7/1> Discrete particles of an alkaline earth metal oxide or carbonate are coated with at least one of the metals Ni, W, Mo, Co, for use in thermionic cathodes. In particular, coprecipitated bariumstrontium oxide, ball-milled to a maximum particle size of 37 m , may be coated with nickel in a fluidized bed system. As shown, a stream of hydrogen, nitrogen or argon, saturated with carbonyl nickel derived from bubbles 20, is passed through fluidization column 11 which is heated to 100 DEG C. for 20 hours. The coated particles may contain 14% by weight nickel and 86% oxide. Alternatively, a stream of hydrogen containing carbonyl nickel vapour may be passed through a suspension of barium-strontium carbonate powder in amyl acetate, which is agitated by a magnetic stirrer and maintained at 80 - 90 DEG C. for 22 hours by an oil bath, Fig. 2 (not shown).
GB35678/64A 1963-09-19 1964-09-01 Thermionic tube cathodes Expired GB1074776A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US31004063A 1963-09-19 1963-09-19
US520488A US3384511A (en) 1963-09-19 1966-01-13 Cathode structures utilizing metal coated powders
US683378A US3404034A (en) 1963-09-19 1967-11-15 Preparation of metal-coated powders and cathode structures

Publications (1)

Publication Number Publication Date
GB1074776A true GB1074776A (en) 1967-07-05

Family

ID=27405432

Family Applications (1)

Application Number Title Priority Date Filing Date
GB35678/64A Expired GB1074776A (en) 1963-09-19 1964-09-01 Thermionic tube cathodes

Country Status (5)

Country Link
US (2) US3384511A (en)
BE (1) BE652784A (en)
DE (1) DE1255207B (en)
GB (1) GB1074776A (en)
NL (1) NL142272B (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3700857A (en) * 1971-04-14 1972-10-24 Bell Telephone Labor Inc Electrical resistance heater
GB1411500A (en) * 1972-09-12 1975-10-29 Siemens Ag Preparation of a catalytic material
US4267247A (en) * 1976-09-10 1981-05-12 Xerox Corporation Low specific gravity magnetic carrier materials
US4264648A (en) * 1976-09-10 1981-04-28 Xerox Corporation Low specific gravity magnetic carrier materials
EP0641007A3 (en) * 1993-08-31 1995-06-21 Samsung Display Devices Co Ltd Direct-heating-type dispenser cathode structure.
US11167260B2 (en) * 2013-06-28 2021-11-09 Korea Institute Of Energy Research Oxygen selective adsorbent for easy desorption and preparation method thereof
WO2022144670A1 (en) 2020-12-29 2022-07-07 3M Innovative Properties Company Electromagnetic absorbing composites

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2698810A (en) * 1950-08-25 1955-01-04 Nat Res Corp Coating process
US2798051A (en) * 1953-05-19 1957-07-02 Universal Oil Prod Co Method of manufacturing a supported catalyst
BE548876A (en) * 1953-08-14
US2858470A (en) * 1955-02-02 1958-10-28 Bell Telephone Labor Inc Cathode for electron discharge devices
US2839423A (en) * 1955-06-03 1958-06-17 Ohio Commw Eng Co Method of coating alkaline earth metal with protective metal
US2874077A (en) * 1957-10-23 1959-02-17 Rauland Corp Thermionic cathodes
US2945295A (en) * 1957-12-20 1960-07-19 Westinghouse Electric Corp High temperature metallic joint
US3023491A (en) * 1958-01-02 1962-03-06 Union Carbide Corp Use of dioxane as a solvent for vapor plating molybdenum, tungsten and chromium from their hexacarbonyls
US2985509A (en) * 1958-02-24 1961-05-23 Union Carbide Corp Method of recovering metal carbonyls from gases
US3088851A (en) * 1959-08-06 1963-05-07 Philips Corp Method of manufacturing oxide cathodes and cathodes manufactured by such methods
US3155864A (en) * 1960-03-21 1964-11-03 Gen Electric Dispenser cathode

Also Published As

Publication number Publication date
DE1255207B (en) 1967-11-30
US3404034A (en) 1968-10-01
NL6409823A (en) 1965-03-22
US3384511A (en) 1968-05-21
BE652784A (en) 1964-12-31
NL142272B (en) 1974-05-15

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