DE647992C - Process for the production of glow cathodes - Google Patents

Process for the production of glow cathodes

Info

Publication number
DE647992C
DE647992C DE1930647992D DE647992DD DE647992C DE 647992 C DE647992 C DE 647992C DE 1930647992 D DE1930647992 D DE 1930647992D DE 647992D D DE647992D D DE 647992DD DE 647992 C DE647992 C DE 647992C
Authority
DE
Germany
Prior art keywords
alkaline earth
metals
production
alkali
cathode
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
DE1930647992D
Other languages
German (de)
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.)
WILHELM FALKENBERG DR
Original Assignee
WILHELM FALKENBERG DR
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 WILHELM FALKENBERG DR filed Critical WILHELM FALKENBERG DR
Application granted granted Critical
Publication of DE647992C publication Critical patent/DE647992C/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
    • H01J9/042—Manufacture, activation of the emissive part

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Solid Thermionic Cathode (AREA)

Description

Verfahren zur Herstellung von Glühkathoden Bei der Untersuchung des Effektes der Emission sauslösung von Erdalkalioxydkathoden. hat sich ergeben, daß gemäß 'dem Dis soziationsgleichgewicht im Laufe der Zeit die Oxydkathode zu einer Erdalkalimetallkathode umgebildet wird. Auf dieser Grundlage sind Verfahren ausgearbeitet worden, durch Zusatz reduzierender Mittel anfangs einen Anteil freien Erdalkalimetalls neben dem OXyd zu bilden oder mittels des Metallaufdampfverfahrens nur reines Erdalkalimetall auf das Trägermaterial zu bringen. Nach letzterem - Verfahren wurde dann auch eine Alkali:metallkathode durch Aufdampfen von Alkalimetallen, wie Kalium, Rubidium :oder Cäsium, hergestellt. -Nach diesen beiden Verfahren hergestellte Kathoden leiden jedoch entweder unter mechanischer Zerstörung durch das, fortgesetzte Glühen, wodurch wegen. ungünstiger Änderungen des Oberflächenhaues, der Emissionsschicht die glühelektrische Wirkung herabgesetzt wird, oder unter Zerstörung durch Verdampfen der niedergeschlagenen aktiven Metallhaut.Process for the manufacture of hot cathodes In the study of the Effect of the emission triggering of alkaline earth oxide cathodes. it turned out that according to the dissociation equilibrium in the course of time the oxide cathode becomes one Alkaline earth metal cathode is reformed. Procedures are worked out on this basis initially a proportion of free alkaline earth metal by adding reducing agents to form only pure alkaline earth metal in addition to the OXyd or by means of the metal vapor deposition process to bring to the carrier material. According to the latter process, a Alkali: metal cathode by vapor deposition of alkali metals such as potassium, rubidium: or Cesium. - Cathodes made using these two methods suffer however either with mechanical destruction by the continued glow, whereby because. unfavorable changes in the surface structure, the emission layer the glowing electrical Effect is diminished, or with destruction by evaporation of the depressed active metal skin.

Erfindungsgemäß hat sich nun ergeben, daß diese beiden üblen Erscheinungen au£ das mindeste herabgesetzt werden und die Aktivität der Glühkathode in ihrer Gesamtheit; hohe Emission bei niedriger Glühtemperatur und lange Lebensdauer, hervortritt, wenn die Emissionsschicht der Kathode aus Erdalkalimetall und Alkalimetall besteht.According to the invention it has now been found that these two bad phenomena reduced to the minimum and the activity of the hot cathode in it Entirety; high emission at low annealing temperature and long service life, emerges, when the emission layer of the cathode is made of alkaline earth metal and alkali metal.

Zur Ausführung des Verfahrens können mit Hilfe des Aufdampfverfahrens leicht zerfallende Verbindungen von Alkali- und Erdalkalimetallen im Vakuum zersetzt und de resultierenden Metalle auf das Trägermaterial niedergeschlagen werden. Um ein vorzeitiges Verdampfen der Alkalim@etalle zu vermeiden, ist es gegebenenfalls, angebrracht, die Alkali- und Erdalkalimetalle getrennt aufzudampfen.The process can be carried out using the vapor deposition process easily decomposing compounds of alkali and alkaline earth metals decomposed in a vacuum and the resulting metals are deposited onto the substrate. Around To avoid premature evaporation of the alkali metals, it may be necessary to appropriate to vaporize the alkali and alkaline earth metals separately.

Claims (1)

PATEN TANSPRÜC11L;: i. Verfahren zur Herstellung von hochemittierenden Glühkathoden mit einer Schichtaus elektropositiven Metallen als Emissionsschicht durch Aufdampfen dieser Metalle im Vakuum auf das Trägermaterial, dadurch, gekennzeichnet, daß sowohl Erdalkalimetalldämpfe als auch Alkalim.etalldämpfe auf das Trägermaterial der Kathode niedergeschlagen werden. a. Verfahren nach Anspruch i, dadurch gekennzeichnet, daß die Alkali- und ErdaJkaliverbindungen nacheinander zersetzt und ,die entstehenden Metalle getrennt aufgedampft werden. PATEN TANSPRÜC11L ;: i. Process for the production of highly emissive hot cathodes with a layer of electropositive metals as emission layer by vapor deposition of these metals in a vacuum on the carrier material, characterized in that both alkaline earth metal vapors and alkali metal vapors are deposited on the carrier material of the cathode. a. Process according to Claim i, characterized in that the alkali and alkaline earth compounds are decomposed one after the other and the metals formed are vapor-deposited separately.
DE1930647992D 1930-06-06 1930-06-06 Process for the production of glow cathodes Expired DE647992C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE647992T 1930-06-06

Publications (1)

Publication Number Publication Date
DE647992C true DE647992C (en) 1937-07-19

Family

ID=6581072

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1930647992D Expired DE647992C (en) 1930-06-06 1930-06-06 Process for the production of glow cathodes

Country Status (1)

Country Link
DE (1) DE647992C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1025998B (en) * 1954-06-23 1958-03-13 Philips Nv Process for the production of oxide cathodes for electron tubes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1025998B (en) * 1954-06-23 1958-03-13 Philips Nv Process for the production of oxide cathodes for electron tubes

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