GB1525005A - Thermionic reaction cathode - Google Patents

Thermionic reaction cathode

Info

Publication number
GB1525005A
GB1525005A GB4362375A GB4362375A GB1525005A GB 1525005 A GB1525005 A GB 1525005A GB 4362375 A GB4362375 A GB 4362375A GB 4362375 A GB4362375 A GB 4362375A GB 1525005 A GB1525005 A GB 1525005A
Authority
GB
United Kingdom
Prior art keywords
cathode
monolayer
oct
heated
compound
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
GB4362375A
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.)
BBC Brown Boveri AG Switzerland
BBC Brown Boveri France SA
Original Assignee
BBC Brown Boveri AG Switzerland
BBC Brown Boveri France SA
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 BBC Brown Boveri AG Switzerland, BBC Brown Boveri France SA filed Critical BBC Brown Boveri AG Switzerland
Publication of GB1525005A publication Critical patent/GB1525005A/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
    • 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

Landscapes

  • Solid Thermionic Cathode (AREA)
  • Powder Metallurgy (AREA)

Abstract

1525005 Cathode materials and processing BBC BROWN BOVERI & CO Ltd 23 Oct 1975 [25 Oct 1974] 43623/75 Heading H1D A thermionic cathode with an emissive monolayer of T, La or Th includes a compound which releases one of the elements by a replenishment reaction during cathode operation and Pd, Pt, Rh or Ru to promote diffusion of the Y, La or Th to the monolayer and prevent impoverishment due to evaporation during high temperature operation. Preferred cathodes comprise sintered powdered W, Mo or Ta bodies containing carbide to reduce the compound in the form of an oxide. In one example Mo and La 2 O 3 powder mixture is compressed; reduced in flowing H 2 at 1000‹ C; sintered in H 2 at 1700‹ C.; cut into blanks by spark erosion and polished; electroplated with Pt; heated at 1300‹ C. to diffuse the Pt and anneal; then heated at 1700‹ C. in benzene and H 2 to form a Mo 2 C layer between the Pt layer and Mo-La 2 O 3 substrate: the last step may be carried out before the Pt plating. Alternatively the initial mixture may contain 0À5% Pt and the plating step omitted. The cathodes contain 0-05 to 10% Y, La or Th and 0À01 to 5% Pd, Pt, Rh or Ru. The cathode may be drawn into a wire.
GB4362375A 1974-10-25 1975-10-23 Thermionic reaction cathode Expired GB1525005A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH1429574A CH579824A5 (en) 1974-10-25 1974-10-25

Publications (1)

Publication Number Publication Date
GB1525005A true GB1525005A (en) 1978-09-20

Family

ID=4399626

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4362375A Expired GB1525005A (en) 1974-10-25 1975-10-23 Thermionic reaction cathode

Country Status (10)

Country Link
JP (1) JPS5826607B2 (en)
AT (1) AT355683B (en)
CH (1) CH579824A5 (en)
CS (1) CS211375B2 (en)
DE (2) DE2454569C3 (en)
FR (1) FR2290025A1 (en)
GB (1) GB1525005A (en)
HU (1) HU177075B (en)
NL (1) NL184984C (en)
SU (1) SU680670A3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5239931A (en) * 1991-02-11 1993-08-31 Jobs S.P.A. Automotive truck with robot and automatic batteries replacement system

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH582951A5 (en) * 1973-07-09 1976-12-15 Bbc Brown Boveri & Cie
CH629033A5 (en) * 1978-05-05 1982-03-31 Bbc Brown Boveri & Cie GLOWH CATHODE.
DE2822665A1 (en) * 1978-05-05 1979-11-08 Bbc Brown Boveri & Cie GLOW CATHODE MATERIAL
FR2498372A1 (en) * 1981-01-16 1982-07-23 Thomson Csf DIRECT HEATING CATHODE, METHOD FOR MANUFACTURING SAME, AND ELECTRONIC TUBE INCLUDING SUCH A CATHODE
DE3205746A1 (en) * 1982-02-18 1983-08-25 Philips Patentverwaltung Gmbh, 2000 Hamburg THERMIONIC CATHODE AND METHOD FOR THE PRODUCTION THEREOF
DE3904552A1 (en) * 1989-02-15 1990-08-16 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh HIGH PRESSURE DISCHARGE LAMP FOR AC POWER OPERATION
DE4114487A1 (en) * 1991-05-03 1992-11-05 Wilhelm Dr Ing Ziegenbein High-output hot cathode for electronic appts. - has tantalum@ support to which tungsten-thorium pieces are applied
DE4114856A1 (en) * 1991-05-07 1992-11-12 Licentia Gmbh STOCK CATHODE AND METHOD FOR THE PRODUCTION THEREOF

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5239931A (en) * 1991-02-11 1993-08-31 Jobs S.P.A. Automotive truck with robot and automatic batteries replacement system

Also Published As

Publication number Publication date
SU680670A3 (en) 1979-08-15
FR2290025B1 (en) 1980-01-04
ATA810575A (en) 1979-08-15
DE2454569B2 (en) 1978-01-19
CS211375B2 (en) 1982-02-26
NL184984C (en) 1989-12-18
DE2454569A1 (en) 1976-04-29
DE2454569C3 (en) 1978-09-14
DE7438425U (en) 1976-09-16
NL7512403A (en) 1976-04-27
HU177075B (en) 1981-07-28
AT355683B (en) 1980-03-10
NL184984B (en) 1989-07-17
FR2290025A1 (en) 1976-05-28
JPS5191659A (en) 1976-08-11
CH579824A5 (en) 1976-09-15
JPS5826607B2 (en) 1983-06-03

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee