GB824902A - Improvements in cathodes and emissive material therefor - Google Patents

Improvements in cathodes and emissive material therefor

Info

Publication number
GB824902A
GB824902A GB10567/58A GB1056758A GB824902A GB 824902 A GB824902 A GB 824902A GB 10567/58 A GB10567/58 A GB 10567/58A GB 1056758 A GB1056758 A GB 1056758A GB 824902 A GB824902 A GB 824902A
Authority
GB
United Kingdom
Prior art keywords
cathode
bao
mixture
barium
april
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
GB10567/58A
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Publication of GB824902A publication Critical patent/GB824902A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H01J61/067—Main electrodes for low-pressure discharge lamps
    • H01J61/0675—Main electrodes for low-pressure discharge lamps characterised by the material of the electrode
    • H01J61/0677—Main electrodes for low-pressure discharge lamps characterised by the material of the electrode characterised by the electron emissive material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2922—Nonlinear [e.g., crimped, coiled, etc.]
    • Y10T428/2925—Helical or coiled
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2913—Rod, strand, filament or fiber
    • Y10T428/2933—Coated or with bond, impregnation or core
    • Y10T428/294—Coated or with bond, impregnation or core including metal or compound thereof [excluding glass, ceramic and asbestos]
    • Y10T428/2958—Metal or metal compound in coating

Landscapes

  • Solid Thermionic Cathode (AREA)

Abstract

824,902. Cathode materials and processing. GENERAL ELECTRIC CO. April 2, 1958 [April 29, 1957], No. 10567/58. Class 39(1). A cathode, particularly for photographic flash tubes, comprises a conductive core and an emissive coating thereon of barium aluminate and barium corresponding to the formula (xBaO.Al 2 O 3 ).yBa wherein x lies between extends from 0À1 but is less than 1 and y is between 0À5x and 2À6x. The preferred mixture lies in the range between BaO.Al 2 O 3 .0À48 Ba and 0À34 BaO. Al 2 O 3 . 0À89 Ba. Such an emissive material may be made by mixing the requisite amount of aluminium powder having a grain size of 3Á with a barium aluminate compound which may contain excess BaO, for example 1À76 BaO. Al 2 O 3 . The mixture may then be coated on a cathode body such as a nickel grid, an iron cup or a tungsten coil by dipping the body into the dry powder, or into a slurry of the mixture with butylacetate or by inserting particles or pellets of the pressed mixture into the cathode. The cathode is activated by heating to a temperature between 600‹C. nd 1200‹C., preferably to 660‹C. at which temperature the aluminium reacts with some of the barium oxide to form Ba and Al 2 O 3 , no gases being evolved. The activation may be carried out by the usual methods such as heating by radiation, passing current through the cathode coil, low pressure arc or glow discharge in argon or by conduction from a hot surface, in particular by heat conducted from a source used to seal the cathode in a glass tube. The activation may also take place in an atmosphere of hydrogen or an inert gas or in a vacuum.
GB10567/58A 1957-04-29 1958-04-02 Improvements in cathodes and emissive material therefor Expired GB824902A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US655534A US2871196A (en) 1957-04-29 1957-04-29 Cathodes and emissive material therefor

Publications (1)

Publication Number Publication Date
GB824902A true GB824902A (en) 1959-12-09

Family

ID=24629268

Family Applications (1)

Application Number Title Priority Date Filing Date
GB10567/58A Expired GB824902A (en) 1957-04-29 1958-04-02 Improvements in cathodes and emissive material therefor

Country Status (3)

Country Link
US (1) US2871196A (en)
GB (1) GB824902A (en)
NL (2) NL227293A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3188236A (en) * 1959-12-17 1965-06-08 Gen Electric Cathodes and method of manufacture
US4275330A (en) * 1979-03-08 1981-06-23 General Electric Company Electric discharge lamp having a cathode with cesium metal oxide

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1934830A (en) * 1928-02-03 1933-11-14 Electrons Inc Amphoteric compounds
US1921066A (en) * 1928-11-16 1933-08-08 Western Electric Co Cathode for electron discharge devices and method of making the same
US1946603A (en) * 1929-05-09 1934-02-13 Electrons Inc Cathode for electrical discharge devices
US2085605A (en) * 1934-05-11 1937-06-29 Gen Electric Thermionic cathode for electric discharge devices
US2142331A (en) * 1935-03-09 1939-01-03 Bell Telephone Labor Inc Electron emitting cathode
US2300959A (en) * 1940-01-01 1942-11-03 Gen Electric Cathode for discharge devices

Also Published As

Publication number Publication date
US2871196A (en) 1959-01-27
NL112306C (en)
NL227293A (en)

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