EP0056749A2 - Direkt geheizte Kathode und Verfahren zu ihrer Herstellung - Google Patents

Direkt geheizte Kathode und Verfahren zu ihrer Herstellung Download PDF

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Publication number
EP0056749A2
EP0056749A2 EP82400030A EP82400030A EP0056749A2 EP 0056749 A2 EP0056749 A2 EP 0056749A2 EP 82400030 A EP82400030 A EP 82400030A EP 82400030 A EP82400030 A EP 82400030A EP 0056749 A2 EP0056749 A2 EP 0056749A2
Authority
EP
European Patent Office
Prior art keywords
tungsten
mixture
layer
cathode
cathode according
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.)
Granted
Application number
EP82400030A
Other languages
English (en)
French (fr)
Other versions
EP0056749A3 (en
EP0056749B1 (de
Inventor
Guy Clerc
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.)
Thales SA
Original Assignee
Thomson CSF 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9254238&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0056749(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0056749A2 publication Critical patent/EP0056749A2/de
Publication of EP0056749A3 publication Critical patent/EP0056749A3/fr
Application granted granted Critical
Publication of EP0056749B1 publication Critical patent/EP0056749B1/de
Expired legal-status Critical Current

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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

Definitions

  • the subject of the present invention is a cathode for a high frequency electronic tube, and more particularly a thermoelectronic emission cathode with direct heating.
  • the cathodes are generally produced from tungsten or thoriated tungsten wires for reasons of thermoelectronic emissivity, the operating temperature is then between 1900 and 2000 ° K.
  • Mechanical problems then arise due to the difference in thermal behavior of the materials, problems imperfectly resolved by expensive mechanical assemblies. It has been proposed to avoid thermo-mechanical problems inside the. tube while ensuring good thermo-electronic emissivity by introducing direct heating from a pyrolytic graphite support and by depositing on the graphite surface a material emitting at a lower temperature than tungsten or thoriated tungsten such as hexaborure lanthanum LaB 6 for example.
  • Such a structure makes it possible to obtain electronic emission at a temperature between 1400 and 1500 ° C.
  • emissive materials such as lanthanum hexaboride is their high chemical activity vis-à-vis hot graphite, which can lead to the destruction of the cathode.
  • the present invention relates to a direct heating cathode working at the same temperature as the hexa cathode lanthanum boride, but not requiring an intermediate layer between the graphite and the emissive layer.
  • the advantage lies in the elimination of the intermediate layer.
  • the cathode according to the invention comprises a pyrolytic graphite support heated by the Joule effect and an emissive coating composed of a mixture of tungsten and rare earth oxide (lanthanum oxide for example).
  • the emissive layer can be carburized on the surface to improve the emission.
  • This comprises a support 1 of pyrolytic graphite with a thickness of about 200 p, on which a homogeneous layer 2 is deposited, by plasma or by cathode sputtering, or by any other means known to those skilled in the art.
  • a homogeneous layer 2 is deposited, by plasma or by cathode sputtering, or by any other means known to those skilled in the art.
  • the thickness of layer 2 can be between 50 and 100 ⁇ .
  • the tungsten of the emissive layer can be transformed in its surface part 3, over a thickness of 10 to 20 u, into tungsten hemicarb W 2 C. This transformation is carried out in the usual way by heating the cathode in vapors. hydrocarbon at a temperature of around 1800 ° C.
  • tungsten carbide can be codeposited with tungsten and lanthanum oxide, in proportions ranging from 10% to 50% carbide, from 0.5 to 10% lanthanum oxide, the balance being made by tungsten. This variant allows you to choose undermine the carburetion process of tungsten.

Landscapes

  • Solid Thermionic Cathode (AREA)
EP82400030A 1981-01-16 1982-01-08 Direkt geheizte Kathode und Verfahren zu ihrer Herstellung Expired EP0056749B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8100782 1981-01-16
FR8100782A FR2498372A1 (fr) 1981-01-16 1981-01-16 Cathode a chauffage direct, son procede de fabrication, et tube electronique incorporant une telle cathode

Publications (3)

Publication Number Publication Date
EP0056749A2 true EP0056749A2 (de) 1982-07-28
EP0056749A3 EP0056749A3 (en) 1982-08-25
EP0056749B1 EP0056749B1 (de) 1984-10-17

Family

ID=9254238

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82400030A Expired EP0056749B1 (de) 1981-01-16 1982-01-08 Direkt geheizte Kathode und Verfahren zu ihrer Herstellung

Country Status (5)

Country Link
US (1) US4577134A (de)
EP (1) EP0056749B1 (de)
JP (1) JPS57138744A (de)
DE (1) DE3260969D1 (de)
FR (1) FR2498372A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4533852A (en) * 1981-12-08 1985-08-06 U.S. Philips Corporation Method of manufacturing a thermionic cathode and thermionic cathode manufactured by means of said method
EP0637046A1 (de) * 1993-07-29 1995-02-01 Nec Corporation Thermisch emittierende Kathode, Herstellungsverfahren einer solchen thermisch emittierende Kathode und Elektronenstrahl-Gerät

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4810926A (en) * 1987-07-13 1989-03-07 Syracuse University Impregnated thermionic cathode
DE4026300A1 (de) * 1990-08-20 1992-02-27 Siemens Ag Elektronenemitter einer roentgenroehre
FR2733856B1 (fr) * 1995-05-05 1997-08-29 Thomson Tubes Electroniques Cathode pour canon a electrons a grille, grille destinee a etre associee avec une telle cathode et canon a electrons comportant une telle cathode
FR2775118B1 (fr) 1998-02-13 2000-05-05 Thomson Tubes Electroniques Grille pour tube electronique a faisceau axial a performances ameliorees
FR2789800B1 (fr) 1999-02-16 2001-05-11 Thomson Tubes Electroniques Generateur radiofrequence de tres grande puissance
DE102008020187A1 (de) * 2008-04-22 2009-10-29 Siemens Aktiengesellschaft Kathode mit einem Flachemitter
CN103998635B (zh) * 2011-12-20 2017-01-18 株式会社东芝 钨合金、以及使用该钨合金的钨合金部件、放电灯、发射管和磁控管
US20170330725A1 (en) * 2016-05-13 2017-11-16 Axcelis Technologies, Inc. Lanthanated tungsten ion source and beamline components

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3389977A (en) * 1964-08-05 1968-06-25 Texas Instruments Inc Tungsten carbide coated article of manufacture
US3719856A (en) * 1971-05-19 1973-03-06 O Koppius Impregnants for dispenser cathodes
CH582951A5 (de) * 1973-07-09 1976-12-15 Bbc Brown Boveri & Cie
NL175480C (nl) * 1974-06-12 1984-11-01 Philips Nv Elektrode voor een ontladingslamp, werkwijze voor de vervaardiging van een dergelijke elektrode en ontladingslamp voorzien van een dergelijke elektrode.
US4019081A (en) * 1974-10-25 1977-04-19 Bbc Brown Boveri & Company Limited Reaction cathode
CH579824A5 (de) * 1974-10-25 1976-09-15 Bbc Brown Boveri & Cie
JPS6053418B2 (ja) * 1976-08-09 1985-11-26 株式会社日立製作所 電子管陰極構体
DE2732960C2 (de) * 1977-07-21 1982-04-01 Philips Patentverwaltung Gmbh, 2000 Hamburg Glühkathode und Verfahren zu ihrer Herstellung
DE2838020C3 (de) * 1978-08-31 1987-06-19 Siemens AG, 1000 Berlin und 8000 München Direkt geheizte Kathode für Senderöhren mit koaxialem Aufbau der Elektroden
FR2445605A1 (fr) * 1978-12-27 1980-07-25 Thomson Csf Cathode a chauffage direct et tube electronique haute frequence comportant une telle cathode

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4533852A (en) * 1981-12-08 1985-08-06 U.S. Philips Corporation Method of manufacturing a thermionic cathode and thermionic cathode manufactured by means of said method
EP0637046A1 (de) * 1993-07-29 1995-02-01 Nec Corporation Thermisch emittierende Kathode, Herstellungsverfahren einer solchen thermisch emittierende Kathode und Elektronenstrahl-Gerät

Also Published As

Publication number Publication date
DE3260969D1 (en) 1984-11-22
EP0056749A3 (en) 1982-08-25
FR2498372A1 (fr) 1982-07-23
EP0056749B1 (de) 1984-10-17
FR2498372B1 (de) 1983-07-22
JPS57138744A (en) 1982-08-27
US4577134A (en) 1986-03-18

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