GB1142728A - Improved thermionic cathodes for electron discharge devices - Google Patents

Improved thermionic cathodes for electron discharge devices

Info

Publication number
GB1142728A
GB1142728A GB37325/66A GB3732566A GB1142728A GB 1142728 A GB1142728 A GB 1142728A GB 37325/66 A GB37325/66 A GB 37325/66A GB 3732566 A GB3732566 A GB 3732566A GB 1142728 A GB1142728 A GB 1142728A
Authority
GB
United Kingdom
Prior art keywords
wire
coating
thermionic
firing
aug
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
GB37325/66A
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 GB1142728A publication Critical patent/GB1142728A/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

Landscapes

  • Solid Thermionic Cathode (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)

Abstract

1,142,728. Thermionic cathode constructions. VARIAN ASSOCIATES. 19 Aug., 1966 [23 Aug., 1965], No. 37325/66. Heading H1D. [Also in Division C7] A cathode assembly 14 comprises a thermionic cathode 15 mounted on a sleeve 18 surrounding a refractory metal heater wire 17 having a coating of minute refractory metal particles bonded to its surface to reduce its operating temperature. An oxide type cathode assembly 14 for use in a reflux type klystron comprises a Ni button 15 coated with a thermionic emissive material 16, mounted on a Ni sleeve 18 containing the W, Rh or Rh-W alloy heater wire 17. The wire is coated with W, Mo or Rh particles which increase the adhesion of a subsequent Al 2 O 3 coating. The wire may be in contact with or spaced from and supported in the tube. The particle layer can be applied either by dipping the bare wire in a suspension of W powder in xylene and methacrylate then firing in H 2 at 1500‹ C. or by cataphoretic deposition from a suspension of W powder in methanol with yttrium nitrate, Al(NO 3 ) 3 and water using an Al anode then firing in wet NH 3 at 1650‹ C. The fired heaters may be redipped in H 2 WO 4 and NH 4 OH and retired. The Al 2 O 3 coating may be cataphoretically or vapour deposited.
GB37325/66A 1965-08-23 1966-08-19 Improved thermionic cathodes for electron discharge devices Expired GB1142728A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US481818A US3401297A (en) 1965-08-23 1965-08-23 Thermionic cathodes for electron discharge devices with improved refractory metal heater wires

Publications (1)

Publication Number Publication Date
GB1142728A true GB1142728A (en) 1969-02-12

Family

ID=23913509

Family Applications (1)

Application Number Title Priority Date Filing Date
GB37325/66A Expired GB1142728A (en) 1965-08-23 1966-08-19 Improved thermionic cathodes for electron discharge devices

Country Status (3)

Country Link
US (1) US3401297A (en)
DE (1) DE1589024B2 (en)
GB (1) GB1142728A (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL153018B (en) * 1967-02-17 1977-04-15 Philips Nv INDIRECTLY HEATED CATHODE.
US3852105A (en) * 1972-04-07 1974-12-03 Rca Corp Fabrication of dark heaters
US3808043A (en) * 1972-05-30 1974-04-30 Rca Corp Method of fabricating a dark heater
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
US4126489A (en) * 1973-07-17 1978-11-21 Varian Associates, Inc. Method of making cathode heaters
US3936532A (en) * 1974-02-08 1976-02-03 Oregon Graduate Center For Study And Research Activation of thin wire emitters for field ionization/field desorption mass spectrometry
US5041041A (en) * 1986-12-22 1991-08-20 Gte Products Corporation Method of fabricating a composite lamp filament

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3029360A (en) * 1958-04-29 1962-04-10 Rca Corp Heater wire coating process
NL268393A (en) * 1960-08-19
US3161540A (en) * 1962-06-20 1964-12-15 Sylvania Electric Prod Process of manufacturing insulated heater wire and article
DE1250013B (en) * 1963-10-24
US3328201A (en) * 1964-04-27 1967-06-27 Rca Corp Heater for electron tubes
US3268305A (en) * 1964-08-17 1966-08-23 Sylvania Electric Prod Composite wire

Also Published As

Publication number Publication date
DE1589024A1 (en) 1970-03-19
US3401297A (en) 1968-09-10
DE1589024B2 (en) 1975-04-30

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