DE559242C - Process for the manufacture of oxide cathodes - Google Patents

Process for the manufacture of oxide cathodes

Info

Publication number
DE559242C
DE559242C DEH95179D DEH0095179D DE559242C DE 559242 C DE559242 C DE 559242C DE H95179 D DEH95179 D DE H95179D DE H0095179 D DEH0095179 D DE H0095179D DE 559242 C DE559242 C DE 559242C
Authority
DE
Germany
Prior art keywords
oxide
manufacture
mixture
metals
chosen
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
DEH95179D
Other languages
German (de)
Inventor
Johannes Michael Schmierer
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.)
Dr Erich F Huth GmbH
Original Assignee
Dr Erich F Huth GmbH
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 Dr Erich F Huth GmbH filed Critical Dr Erich F Huth GmbH
Priority to DEH95179D priority Critical patent/DE559242C/en
Application granted granted Critical
Publication of DE559242C publication Critical patent/DE559242C/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

Landscapes

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

Description

Verfahren zur Herstellung von Oxydkathoden Es ist bekannt, daß man die Heizfäden für Thermionenröhren mit einem Gemisch von mehreren Oxyden überziehen kann, um die guten mechanischen Eigenschaften einer Oxydart mit der hohen Emission der anderen Oxydart zu verbinden. Für die Herstellung derartiger mit einer Mischoxydschicht überzogenen Elektroden benutzte man bisher entweder das elektrolytische Verfahren oder das Tauchverfahren, d. h. die Seele des Heizfadens wurde entweder zunächst auf elektrolytischem Wege mit einer Legierung der fraglichen Metalle überzogen, und diese wurden nachträglich z. B. durch Glühen an der Luft oxydiert, oder aber man tauchte den Faden in eine Aufschwemmung der fraglichen Oxyde. Beide Verfahren haben ihre Nachteile. Da es sich um Oxyde von elektropositiven Metallen handelt, ist eine Elektro-:yse umständlich, insbesondere wenn es sich darum handelt, eine Legierung herzustellen, :n der das Verhältnis der Komponenten genau eingehalten werden muß. Andererseits :st beim Tauchverfahren weder die Gleichmäßigkeit gewährleistet noch die hohe Festigkeit; weil j a das an sich festere Oxyd mit dem anderen durchsetzt ist. Gemäß der Erfindung werden diese Nachteile dadurch be-@eitigt, daß man den Faden zunächst in einer an und für sich bekannten Weise mit dem Jxyd nur eines der beiden Metalle überzieht, und zwar zweckmäßig mit demjenigen Oxyd, das in größter Menge verwendet werden soll. Anschließend wird die Oxydschicht getränkt mit der Lösung von Salzen der anderen Metalle, und diese Salze werden schließlich durch Glühen in Oxyde verwandelt. Man erhält auf diese Weise eine sehr dichte, gleichmäßige und feste Schicht von hohem Emissionsvermögen. Die Konzentration der Salzlösungen wird selbstverständlich so gewählt, daß nach vollendetem Oxydationsprozeß das Gemischverhältnis zwischen den einzelnen Oxyden den gewünschten Wert hat.Process for the production of oxide cathodes It is known that one Cover the filaments for thermion tubes with a mixture of several oxides can to get the good mechanical properties of an Oxydart with the high emission the other Oxydart to connect. For the production of such with a mixed oxide layer Coated electrodes have hitherto been used either by the electrolytic process or the immersion method, d. H. the soul of the filament was either initially Electrolytically coated with an alloy of the metals in question, and these were subsequently z. B. oxidized by annealing in air, or else the thread was dipped into a suspension of the oxides in question. Both procedures have their drawbacks. Since these are oxides of electropositive metals, an Elektro-: yse is cumbersome, especially when it comes to an Manufacture an alloy that: precisely adheres to the ratio of the components must become. On the other hand, the dipping process does not guarantee uniformity nor the high strength; because yes permeates the oxide, which is more solid in itself, with the other is. According to the invention, these disadvantages are eliminated by the fact that the First thread in a manner known per se with the Jxyd only one of the coated both metals, and expediently with that oxide, which is the greatest Amount to be used. The oxide layer is then impregnated with the Dissolve the salts of the other metals, and these salts will eventually pass through Glow transformed into oxides. In this way a very dense, uniform one is obtained and high emissivity solid layer. The concentration of the salt solutions is of course chosen so that the mixture ratio after completion of the oxidation process has the desired value between the individual oxides.

Claims (1)

PATENTANSPRÜCIIE: I. Verfahren zur Herstellung von Oxydkathoden für Elektronenröhren, deren Oxydschicht aus einem Gemenge verschiedener Oxyde besteht, dadurch gekennzeichnet, daß zunächst in an sich bekannter Weise eine Oxydschicht aus nur einem der Metalle erzeugt wird und diese sodann mit der Lösung eines Salzes des zweiten Metalls getränkt wird, deren Konzentration so gewählt ist, daß bei nachträglichem Glühen durch Umwandlung des Salzes in Oxyd eine Mis-choxydschicht in dem gewünschten Mengenverhältnis -entsteht. z. Verfahren nach Anspruch I, dadurch gekennzeichnet, daß als erstes Oxyd dasjenige gewählt wird, das in der größten Menge im Gemisch enthalten sein soll.PATENT CLAIM: I. Process for the production of oxide cathodes for Electron tubes whose oxide layer consists of a mixture of different oxides, characterized in that initially an oxide layer in a manner known per se is produced from only one of the metals and then this with the solution of a salt of the second metal is impregnated, the concentration of which is chosen so that with subsequent Annealing, by converting the salt into oxide, creates a layer of mixed oxide in the desired Quantity ratio-arises. z. Method according to claim I, characterized in that that the first oxide chosen is that which is in the greatest amount in the mixture should be included.
DEH95179D 1923-11-13 1923-11-13 Process for the manufacture of oxide cathodes Expired DE559242C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEH95179D DE559242C (en) 1923-11-13 1923-11-13 Process for the manufacture of oxide cathodes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEH95179D DE559242C (en) 1923-11-13 1923-11-13 Process for the manufacture of oxide cathodes

Publications (1)

Publication Number Publication Date
DE559242C true DE559242C (en) 1932-09-20

Family

ID=7167215

Family Applications (1)

Application Number Title Priority Date Filing Date
DEH95179D Expired DE559242C (en) 1923-11-13 1923-11-13 Process for the manufacture of oxide cathodes

Country Status (1)

Country Link
DE (1) DE559242C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE857533C (en) * 1943-03-15 1952-12-01 Telefunken Gmbh Oxide cathode for electrical discharge vessels

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE857533C (en) * 1943-03-15 1952-12-01 Telefunken Gmbh Oxide cathode for electrical discharge vessels

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