GB1073339A - Cathode assemblies for electron discharge devices - Google Patents

Cathode assemblies for electron discharge devices

Info

Publication number
GB1073339A
GB1073339A GB32810/65A GB3281065A GB1073339A GB 1073339 A GB1073339 A GB 1073339A GB 32810/65 A GB32810/65 A GB 32810/65A GB 3281065 A GB3281065 A GB 3281065A GB 1073339 A GB1073339 A GB 1073339A
Authority
GB
United Kingdom
Prior art keywords
wire
coating
al2o3
carrier gas
vaporized
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
GB32810/65A
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.)
Varian Medical Systems Inc
Original Assignee
Varian Associates 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 Varian Associates Inc filed Critical Varian Associates Inc
Publication of GB1073339A publication Critical patent/GB1073339A/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
    • H01J1/22—Heaters
    • 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

  • Chemical Vapour Deposition (AREA)

Abstract

A coating of Al2O3, BeO, or Y2O3 is formed on a refractory metal wire constituting a cathode heater element (see Division H1) by deposition from a vaporized compound or compounds other than the oxide, thermal decomposition or chemical reaction occurring at the metal surface. In an example, AlCl3 is vaporized and carried, in a controlled mixture of H2 and CO2 at atmospheric pressure, over the wire, which is heated by the passage of current therethrough to a temperature in the range 850 DEG to 1325 DEG C., to produce the reaction 2AlCl3 + 3H2 + 3CO2 --> Al2O3 + 6HCl + 3CO The wire may be of W, Ta, Mo, Re, Pt, Pd, Rh, Os, Ru, Ir, or an alloy thereof. The use of BeCl2 or YCl3 for the preparation of the relevant oxide coating, and the additional presence in the carrier gas of CO, N2 and A, are referred to. Quantitative data concerning carrier gas composition and rate of flow, and deposition time and coating thickness, are given.
GB32810/65A 1964-09-28 1965-07-30 Cathode assemblies for electron discharge devices Expired GB1073339A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US399461A US3372297A (en) 1964-09-28 1964-09-28 High frequency electron discharge devices and thermionic cathodes having improved (cvd) refractory insulation coated heater wires

Publications (1)

Publication Number Publication Date
GB1073339A true GB1073339A (en) 1967-06-21

Family

ID=23579590

Family Applications (1)

Application Number Title Priority Date Filing Date
GB32810/65A Expired GB1073339A (en) 1964-09-28 1965-07-30 Cathode assemblies for electron discharge devices

Country Status (2)

Country Link
US (1) US3372297A (en)
GB (1) GB1073339A (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3894164A (en) * 1973-03-15 1975-07-08 Rca Corp Chemical vapor deposition of luminescent films
DE2317446C3 (en) * 1973-04-06 1983-11-10 Standard Elektrik Lorenz Ag, 7000 Stuttgart Method of manufacturing a heating element for an indirectly heated cathode
US3984587A (en) * 1973-07-23 1976-10-05 Rca Corporation Chemical vapor deposition of luminescent films
US3919581A (en) * 1974-07-12 1975-11-11 Gen Electric Thoria-yttria emission mixture for discharge lamps
US5041041A (en) * 1986-12-22 1991-08-20 Gte Products Corporation Method of fabricating a composite lamp filament
US7575039B2 (en) * 2003-10-15 2009-08-18 United Technologies Corporation Refractory metal core coatings
KR101372841B1 (en) * 2012-04-30 2014-03-13 한국에너지기술연구원 Composite synthesis instrument, composite synthesis method, vaporizer and complex using co-vaporization
JP2017107816A (en) 2015-12-11 2017-06-15 株式会社堀場エステック Filament for thermal electron emission, quadrupole mass spectrometer, and method for analyzing residual gas

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2700626A (en) * 1949-12-09 1955-01-25 Bell Telephone Labor Inc Secondary electron emissive electrodes
US2665998A (en) * 1950-03-18 1954-01-12 Fansteel Metallurgical Corp Method of preparing highly refractory bodies
US2817784A (en) * 1951-01-31 1957-12-24 Siemens Ag Cathode for use in electrical discharge devices
BE512449A (en) * 1955-03-28 1900-01-01
US2991391A (en) * 1957-07-24 1961-07-04 Varian Associates Electron beam discharge apparatus
US3029360A (en) * 1958-04-29 1962-04-10 Rca Corp Heater wire coating process
US3178308A (en) * 1960-09-07 1965-04-13 Pfaudler Permutit Inc Chemical vapor plating process
US3251337A (en) * 1963-07-16 1966-05-17 Robert E Latta Spiral fluidized bed device and method for coating particles

Also Published As

Publication number Publication date
US3372297A (en) 1968-03-05

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