DE632442C - Process for the production of high emission cathodes - Google Patents

Process for the production of high emission cathodes

Info

Publication number
DE632442C
DE632442C DEA69902D DEA0069902D DE632442C DE 632442 C DE632442 C DE 632442C DE A69902 D DEA69902 D DE A69902D DE A0069902 D DEA0069902 D DE A0069902D DE 632442 C DE632442 C DE 632442C
Authority
DE
Germany
Prior art keywords
production
emission cathodes
coating
cathode
high emission
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
DEA69902D
Other languages
German (de)
Inventor
Dr Ernst Friederich
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.)
AEG AG
Original Assignee
AEG 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
Priority to NL38588D priority Critical patent/NL38588C/xx
Application filed by AEG AG filed Critical AEG AG
Priority to DEA69902D priority patent/DE632442C/en
Application granted granted Critical
Publication of DE632442C publication Critical patent/DE632442C/en
Expired legal-status Critical Current

Links

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
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
    • H01J1/26—Supports for the emissive material
    • 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

Landscapes

  • Solid Thermionic Cathode (AREA)

Description

Verfahren zur Herstellung von Hochemissionskathoden Es sind verschiedene Verfahren zur Herstellung von Hochemissionskathoden bekanntgeworden, deren Aufgabe es ist; ein gutes Haften der emittierenden Schicht an dem Kerndraht oder an der Oberfläche der mittelbar geheizten' Kathode zu erzielen. Diese Verfahren haben jedoch nicht immer befriedigt. Es ist beispielsweise bekannt, Bariumazid auf einer mit einem legierbaren Metall versehenen Kathode zu zersetzen. Die hierbei entstehende Legierung verringerte die Festigkeit des Drahtes. Es ist auch bereits bekannt, den Dampf eines Alkali- oder Erdalkalimetalles auf einem oxydierten Kathodendraht niederzuschlagen. Ferner ist es bekannt, den schwer schmelzbaren Kern einer Kathode elektrolytisch mit einem Überzug von blankem Kupfer, Silber oder Gold zu überziehen und darauf die aus emittierenden Stoffen bestehende Schicht aufzutragen.Methods of Making High Emission Cathodes There are several Process for the production of high-emission cathodes became known, their task it is; good adhesion of the emissive layer to the core wire or to the To achieve the surface of the indirectly heated 'cathode. However, these procedures have not always satisfied. For example, it is known to use barium azide on one to decompose an alloyable metal provided cathode. The resulting Alloy decreased the strength of the wire. It is also already known the To deposit vapor of an alkali or alkaline earth metal on an oxidized cathode wire. It is also known to electrolytically apply the difficult-to-melt core of a cathode to be covered with a coating of bare copper, silver or gold and on it to apply the layer consisting of emitting substances.

Nach der Erfindung wird nun die an sich bekannte Hochemissionskathode, die aus einem .schwer schmelzbaren Kern, beispielsweise aus Wolfram, Tantal, Molybdän oder Platin, und einem Überzug von blankem Kupfer, Silber oder Gold besteht, auf den eine Schicht aus emittierenden Stoffen aufgebracht ist, dadurch hergestellt, daß der überzug aus .Kupfer, Silber, Gold o. dgl. aufgeschmolzen wird. Durch das Aufschmelzen wird ein Überzug von besonderer Reinheit erhalten. Diese Reinheit verhindert nicht nur ein Verschlechtern der Emission durch die z. B. bei elektrolytischen Verfahren zurückbleibenden Salze, sondern sie bewirkt anscheinend auf dem gleichen Wege ,auch eine Verringerung der Wärmeabstrahlung und damit eine Verbesserung der Wirtschaftlichkeit der Kathode.According to the invention, the known high-emission cathode, those made of a core that is difficult to melt, for example made of tungsten, tantalum, molybdenum or platinum, and a coating of bare copper, silver or gold to which a layer of emitting substances is applied, produced by, that the coating made of .Copper, silver, gold or the like is melted. By the Melting a coating of particular purity is obtained. This purity prevents not only a worsening of the emission by the z. B. in electrolytic processes remaining salts, but they apparently effects in the same way, too a reduction in heat radiation and thus an improvement in economic efficiency the cathode.

Zur Aufbringung des emittierenden Überzuges können .alle bekannten Verfahren benutzt werden. Das Pasteverfahren, bei dem ein emittierendes Gemisch mit einem Bindemittel aufgetragen wird, hat sich besonders gut bewährt. Bei der Entgasung von elektrischen Entladungsgefäßen mit nach dem Verfahren gemäß der Erfindung hergestellten Kathoden werden vorteilhaft metallische Fangstoffe, wie - Magnesium oder Barium, benutzt.All known ones can be used to apply the emitting coating Procedures are used. The paste process in which an emitting mixture is applied with a binder, has proven to be particularly effective. In the Degassing of electrical discharge vessels using the method according to the invention Manufactured cathodes are advantageously made of metallic traps, such as magnesium or barium.

Die nach der Erfindung hergestellten Kathoden zeichnen sich durch eine gute Emission bei geringem Wattverbrauch aus. Sie sind bei der Herstellung sehr hohen mechanischen Beanspruchungen gewachsen. Kathodendrähte und Kathodenbänder, die nach dem erfindungsgemäßen Verfahren hergestellt waren, konnten 3omal an derselben Stelle scharf gebogen werden, ohne daß die emittierende Schicht absplitterte. Das Verfahren ist daher besonders zur Massenherstellung geeignet, da hierbei die Drähte auf Spulen gewickelt werden.The cathodes produced according to the invention are distinguished by a good emission with low watt consumption. You're in the process of making able to withstand very high mechanical loads. Cathode wires and cathode tapes, which were produced by the method according to the invention could be used 3om times on the same The point can be bent sharply without the emissive layer chipping off. That procedure is therefore particularly suitable for mass production because here the wires are wound on spools.

Claims (1)

PATENTANSPRUCH: :äff #s# Verfahren zur Herstellung von Ho*". emissionskathoden,- die aus einem schwere schmelzbaren Kern, beispielsweise aus Wolfram, Tarital, Molybdän oder Platin, und einem Überzug von blankem Kupfer, Silber oder Gold bestehen, auf den dann eine Schicht aas emittierenden Stoffen aufgebracht ist, dadurch gekennzeichnet, daß der überzag aus Kupfer, Silber, Gold o. dgl. aufgeschmolzen wird.PATENT CLAIM:: äff # s # Process for the production of Ho * ". Emission cathodes, - those made of a heavy fusible core, for example made of tungsten, tarital, molybdenum or platinum, and a coating of bare copper, silver or gold to which a layer of emitting substances is then applied, characterized in that that the coating made of copper, silver, gold or the like is melted.
DEA69902D 1933-07-01 1933-07-01 Process for the production of high emission cathodes Expired DE632442C (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NL38588D NL38588C (en) 1933-07-01
DEA69902D DE632442C (en) 1933-07-01 1933-07-01 Process for the production of high emission cathodes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEA69902D DE632442C (en) 1933-07-01 1933-07-01 Process for the production of high emission cathodes

Publications (1)

Publication Number Publication Date
DE632442C true DE632442C (en) 1936-07-08

Family

ID=6945106

Family Applications (1)

Application Number Title Priority Date Filing Date
DEA69902D Expired DE632442C (en) 1933-07-01 1933-07-01 Process for the production of high emission cathodes

Country Status (2)

Country Link
DE (1) DE632442C (en)
NL (1) NL38588C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE748240C (en) * 1937-08-30 1944-10-30 Process for the production of glow cathodes for electric discharge tubes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE748240C (en) * 1937-08-30 1944-10-30 Process for the production of glow cathodes for electric discharge tubes

Also Published As

Publication number Publication date
NL38588C (en)

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