DE883934C - Process for the production of emission masses for cathodes of electrical discharge vessels - Google Patents

Process for the production of emission masses for cathodes of electrical discharge vessels

Info

Publication number
DE883934C
DE883934C DEL4547D DEL0004547D DE883934C DE 883934 C DE883934 C DE 883934C DE L4547 D DEL4547 D DE L4547D DE L0004547 D DEL0004547 D DE L0004547D DE 883934 C DE883934 C DE 883934C
Authority
DE
Germany
Prior art keywords
cathodes
production
electrical discharge
emission
discharge vessels
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
DEL4547D
Other languages
German (de)
Inventor
Walter Dr Nielsch
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.)
Alcatel Lucent Deutschland AG
Original Assignee
Standard Elektrik Lorenz AG
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 Standard Elektrik Lorenz AG filed Critical Standard Elektrik Lorenz AG
Priority to DEL4547D priority Critical patent/DE883934C/en
Application granted granted Critical
Publication of DE883934C publication Critical patent/DE883934C/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)
  • Electrolytic Production Of Metals (AREA)

Description

Verfahren zur Herstellung von Emissionsmassen für Kathoden von elektrischen Entladungsgefäßen Es ist üblich, die als Emissionsmassen von Kathoden dienenden Verbindungen auf mechanische Art, z. B. durch Tauchen oder Spritzen, oder auf elektrischem Wege, z. B. mittels Elektrophorese, auf die zu bedeckenden Flächen bzw. Körper aufzutragen. Diese Arbeitsverfahren bedingen, daß die Emissionsmassen in den verwendeten Suspensionen eine gewisse Feinheit haben müssen, die durch entsprechende Mahl- oder Fällungsverfahren erzielt werden.Process for the production of emission masses for cathodes of electrical Discharge vessels It is common that serving as emission masses of cathodes Connections in a mechanical way, e.g. B. by dipping or spraying, or on electrical Ways, e.g. B. by means of electrophoresis, to be applied to the surfaces or bodies to be covered. These working methods require that the emission masses in the suspensions used must have a certain fineness, which is achieved by appropriate grinding or precipitation processes be achieved.

Es hat sich nun gezeigt, daß die Formier- und Pumpdaten der Röhren sowie das Emissionsvermögen der Kathoden weitgehend von der Korngröße bei gleicher chemischer Zusammensetzung abhängig sind. Bei der näheren Untersuchung der vorliegenden Korngrößen und den bekannten Mahl-oder Fällungsverfahren hat sich gezeigt, daß der Anteil an größerem und kleinem Korn im Verhältnis zu dem auftretenden Mittelwert der Korngröße recht bedeutend sein kann.It has now been shown that the formation and pumping data of the tubes and the emissivity of the cathodes largely depends on the grain size with the same chemical composition are dependent. Upon closer examination of the present Grain sizes and the known milling or precipitation processes have shown that the Proportion of larger and smaller grain in relation to the occurring mean value the grain size can be quite significant.

Bei der Herstellung von Kathoden wird erfindungsgemäß vorgeschlagen, Suspensionen mit im wesentlichen nur einer Korngröße zu verwenden, die durch Mahlen oder Fällen und anschließende fraktionierte Zentrifugierung . oder Sedimentation gewonnen werden.In the manufacture of cathodes, it is proposed according to the invention that Suspensions with essentially only one grain size can be used by grinding or cases and subsequent fractional centrifugation. or Sedimentation can be obtained.

Der numerische Wert dergünstigsten Korngrößen ist je nach der Art der aufzutragenden Emissionsmasse, dem Auftragsverfahren und dem Verwendungszweck außerordentlich verschieden; er liegt zwischen 5o ,cc bis z o ,u. Nach dem erfindungsgemäßen Verfahren lassen sich Suspensionen und kolloide Lösungen herstellen, in denen nur die gewünschte Korngröße auftritt. Nach dem erfindungsgemäßen Verfahren hergestellte Emissionskathoden zeigen ein Höchstmaß an Emissionsvermögen und eine besondere Gleichmäßigkeit in den Formier-oder Einbrenndaten. Außerdem ist es möglich, durch Auswahl der Korngröße die Formier- oder Einbrennzeit wesentlich abzukürzen.The numerical value of the most favorable grain sizes depends on the species the emission mass to be applied, the application process and the intended use extraordinarily different; it is between 5o, cc to z o, u. According to the invention Process can be used to produce suspensions and colloidal solutions in which only the desired grain size occurs. Manufactured by the process of the invention Emissive cathodes show a high degree of emissivity and a special uniformity in the forming or burn-in data. It is also possible by selecting the grain size to shorten the forming or baking time significantly.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung von Emissionsmassen für Kathoden von elektrischen Entladungsgefäßen, bei dem die Emissionsmasse in im wesentlichen nur einer Korngröße gewonnen wird, dadurch gekennzeichnet, daß Suspensionen oder Lösungen durch Mahlen oder Fällen und anschließende Zentrifugierung bzw. fraktionierte Zentrifugierung oder durch Sedimentation bzw. fraktionierte Sedimentation gewonnen werden.PATENT CLAIM: Process for the production of emission masses for Cathodes of electrical discharge vessels, in which the emission mass is essentially only one grain size is obtained, characterized in that suspensions or Solutions by grinding or precipitation and subsequent centrifugation or fractionated Centrifugation or obtained by sedimentation or fractional sedimentation will.
DEL4547D 1941-08-11 1941-08-12 Process for the production of emission masses for cathodes of electrical discharge vessels Expired DE883934C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEL4547D DE883934C (en) 1941-08-11 1941-08-12 Process for the production of emission masses for cathodes of electrical discharge vessels

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE884195X 1941-08-11
DEL4547D DE883934C (en) 1941-08-11 1941-08-12 Process for the production of emission masses for cathodes of electrical discharge vessels

Publications (1)

Publication Number Publication Date
DE883934C true DE883934C (en) 1953-07-23

Family

ID=25954023

Family Applications (1)

Application Number Title Priority Date Filing Date
DEL4547D Expired DE883934C (en) 1941-08-11 1941-08-12 Process for the production of emission masses for cathodes of electrical discharge vessels

Country Status (1)

Country Link
DE (1) DE883934C (en)

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