DE515095C - Process for the manufacture of oxide cathodes - Google Patents

Process for the manufacture of oxide cathodes

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Publication number
DE515095C
DE515095C DEL59334D DEL0059334D DE515095C DE 515095 C DE515095 C DE 515095C DE L59334 D DEL59334 D DE L59334D DE L0059334 D DEL0059334 D DE L0059334D DE 515095 C DE515095 C DE 515095C
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DE
Germany
Prior art keywords
oxide
alkaline earth
earth metals
metal
production
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
DEL59334D
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German (de)
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Individual
Original Assignee
Individual
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.)
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Publication date
Application filed by Individual filed Critical Individual
Priority to DEL59334D priority Critical patent/DE515095C/en
Application granted granted Critical
Publication of DE515095C publication Critical patent/DE515095C/en
Expired legal-status Critical Current

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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

Description

Verfahren zur Herstellung von Oxydkathoden Der Nachteil, welcher den heutigen Oxydglühelektroden anhaftet, liegt an der geringen Haltbarkeit der Oxydschicht auf dem Glühdraht.Process for the production of oxide cathodes The disadvantage which the adheres to today's oxide glow electrodes, is due to the low durability of the oxide layer on the filament.

Vorliegendes Verfahren gestattet in einfachster Weise, das auf den Draht zu bringende Oxyd mit demselben auf das innigste zu verbinden, wodurch die Glühelektrode als Elektronenquelle eine große Lebensdauer erhält. Wird z. B. der mit dem wirksamen Metalloxyd (Calciumoxyd o. dgl.) zu überziehende Draht mit dem pulverisierten Metall des aufzutr agenden Oxyds umgeben und im Vakuum oder einer inerten Atmosphäre erhitzt, dann durchdringt (legiert) das Metall den Trägerdraht und hält nach Unterbrechung des Prozesses äußerst fest an demselben. Durch schwaches Glühen an der Luft oder auf chemischem oder elektrolytischem Wege gelingt es mit Leichtigkeit, das Metall in das entsprechende Oxyd zu überführen; welches dann seinerseits ebenfalls fest an dem Glühdraht haftet. Selbstverständlich kann man das Verfahren in der Weise abändern, daß man den Draht nicht in Metallpulver, sondern in das geschmolzene Metall hineinlegt oder mit bestimmter Geschwindigkeit durch dasselbe hindurchzieht. Ebenso können Mischungen von verschiedenen Metallen angewendet werden.The present method allows in the simplest way that on the Wire to connect the oxide to be brought with it in the most intimate manner, whereby the Glow electrode as an electron source has a long service life. Is z. B. the with the active metal oxide (calcium oxide or the like) to be coated with the wire surrounded powdered metal of the oxide to be applied and in a vacuum or a Heated in an inert atmosphere, then the metal penetrates (alloyed) the carrier wire and, after the process is interrupted, holds on to it very firmly. By weak Glowing in air or by chemical or electrolytic means is also successful Ease of converting the metal into the corresponding oxide; which then in turn also firmly adheres to the filament. Of course you can do the procedure Modify it in such a way that the wire is not in metal powder but in the molten one Lays metal in it or pulls it through it at a certain speed. Mixtures of different metals can also be used.

Es ist bereits vorgeschlagen worden, die wirksame chemische Metallverbindung in geschmolzenem Zustand mit dem Trägerdraht der Glühkathode zu verbinden oder auch den Draht mit einer pulverisierten Mischung von verschiedenen chemischen Metallverbindungen zu umgeben. Bei beiden Vorschlägen geht man von einer chemischen Metallverbindung, der Erdalkaligruppe, aus, welche durch nachträgliche Erhitzung in das Oxyd zerfällt.It has already been proposed to be the most effective chemical metal compound to connect or also in the molten state with the carrier wire of the hot cathode the wire with a powdered mixture of different chemical metal compounds to surround. Both proposals assume a chemical metal compound, the alkaline earth group, which decomposes into the oxide through subsequent heating.

Vorliegende Erfindung benutzt dagegen für die Herstellung des Oxydüberzuges auf der Kathode die Metalle, indem der Träger der Oxydschicht mit den aufzutragenden Metallen in enger Berührung erhitzt wird.In contrast, the present invention is used for the production of the oxide coating on the cathode the metals by placing the support of the oxide layer with the to be applied Metals is heated in close contact.

Claims (1)

PATENTANSPRÜCI3E: i. Verfahren .zur Herstellung vonOxydkathoden, die aus einem Kern von schwer schmelzbarem Metall, welcher mit Oxyden der Erdalkalimetalle überzogen ist, bestehen, dadurch gekennzeichnet, daß zur Herstellung des Überzuges der Träger in ein geschmolzenes Bad der Erdalkalimetalle eingetaucht wird, unter Erhitzung im Vakuum oder in einer inerten Atmosphäre, worauf dann der Metallüberzug in das entsprechende Oxyd übergeführt wird. a. Abänderung des Verfahrens nach Anspruch i, dadurch gekennzeichnet, daß zur Herstellung des Überzuges der Träger in eine pulverförmige Masse der Erdallcalimetalle, unter Erhitzung im Vakuum oder in einer inerten Atmosphäre eingebettet wird, worauf dann der Metallüberzug in das entsprechende Oxyd übergeführt wird. 3. Verfahren nach Anspruch i oder 2, dadurch gekennzeichnet, daß verschiedene Erdalkalimetalle gemischt angewandt werden.PATENT CLAIMS: i. Process. For the production of oxide cathodes that from a core of hard-to-melt metal, which with oxides of the alkaline earth metals is coated, are characterized in that for the production of the coating the carrier is immersed in a molten bath of the alkaline earth metals, under Heating in a vacuum or in an inert atmosphere, whereupon the metal coating is converted into the corresponding oxide. a. Modification of the method according to claim i, characterized in that for the production of the coating of the carrier in a powdery mass of the alkaline earth metals, with heating in a vacuum or in a inert atmosphere is embedded, whereupon the metal coating in the corresponding Oxyd is transferred. 3. The method according to claim i or 2, characterized in that that different alkaline earth metals are used mixed.
DEL59334D 1924-01-25 1924-01-25 Process for the manufacture of oxide cathodes Expired DE515095C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEL59334D DE515095C (en) 1924-01-25 1924-01-25 Process for the manufacture of oxide cathodes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL59334D DE515095C (en) 1924-01-25 1924-01-25 Process for the manufacture of oxide cathodes

Publications (1)

Publication Number Publication Date
DE515095C true DE515095C (en) 1930-12-20

Family

ID=7279805

Family Applications (1)

Application Number Title Priority Date Filing Date
DEL59334D Expired DE515095C (en) 1924-01-25 1924-01-25 Process for the manufacture of oxide cathodes

Country Status (1)

Country Link
DE (1) DE515095C (en)

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