DE844029C - Not used as a glow cathode for an electrical discharge vessel - Google Patents

Not used as a glow cathode for an electrical discharge vessel

Info

Publication number
DE844029C
DE844029C DET2326D DET0002326D DE844029C DE 844029 C DE844029 C DE 844029C DE T2326 D DET2326 D DE T2326D DE T0002326 D DET0002326 D DE T0002326D DE 844029 C DE844029 C DE 844029C
Authority
DE
Germany
Prior art keywords
electrical discharge
discharge vessel
glow cathode
cathode
metal
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
DET2326D
Other languages
German (de)
Inventor
Walter Berg
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.)
Telefunken AG
Original Assignee
Telefunken 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 Telefunken AG filed Critical Telefunken AG
Priority to DET2326D priority Critical patent/DE844029C/en
Application granted granted Critical
Publication of DE844029C publication Critical patent/DE844029C/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
    • H01J2893/0012—Constructional arrangements
    • H01J2893/0019—Chemical composition and manufacture
    • H01J2893/0022—Manufacture
    • H01J2893/0023—Manufacture carbonising and other surface treatments

Landscapes

  • Electrodes For Compound Or Non-Metal Manufacture (AREA)

Description

die einer hohen Last ausgesetzt sind; mit Überz zu versehen; die ehre gute Wärmeabstrahlung besitzen. Die bisher angewa emfghren'gurnAufbringen von Kohlernstoff, sf°m Chröm,'Ctiröm-' oxyd,,porigem zilkon und ähnlichen Stoffen haben äoefr entfiele röhrentechnische oder aber punnp-' tMrdijeh@ >Täcthteile. So wird z. B. bei der Koldenschwärzung oftmals die Kathode du'rc'h Kg lile. wasserstoff ungünstig beeinflußt. Bei Verwende'1, von Chrom oder Chromoxyd muß die Entgasung'cter Elektroden bei verhältnismäßig niedrigen Temperg=--turen vorgenommen werden, da das Chrom sonst verdampft oder das Chromoxyd sich zersetzt. Diese, geringe Entgasung führt aber oft "s#uabrüehen,' wodurch wieder die Kathode vergiftet wird. Verwendet man Zirkon oder " nlkhe I1jetalle in der üblichen- Form, so besteht ietdefh=, dB bei der:' Erhitzung auf ausreichende Entgasungstemperätur das aufgebrachte Metall mit dem Unterlagmetall legiert, wobei entweder das Unterlagmetall schmilzt oder der Überzug zum mindesten blank wird.: Auch das Aufbringen des: Überzugmetalla' ats 'Vebindung, z. B. als Zirkorrhydrid, hat nicht immer befriedigt, da für das Austreiben des Wasserstoffes ,,eine lange Fntgesengszeitnotweadig ist.that are exposed to a high load; to be provided with cover; the honor have good heat radiation. The previously applied emfghren'gurn application of carbon fiber, sf ° m Chröm, 'Ctiröm-' oxide, porous cilcon and similar materials have been omitted Tubular or punnp- 'tMrdijeh @> Täcthteile. So z. B. at the Cold blackening often the cathode du'rc'h Kg lile. hydrogen adversely affected. When using chromium or chromium oxide, the degassing of electrodes must be relatively low low tempering temperatures, otherwise the chromium will evaporate or the chromium oxide decomposes. This, little degassing, however, often leads to "s # uabruehen," again poisoning the cathode. If one uses zirconium or "nlkhe I1jetalle" in the usual form, ietdefh =, dB in the case of: 'Heating to sufficient Degassing temperature alloyed the applied metal with the base metal, wherein either the base metal melts or the coating is at least bright: Also the application of: Überzugmetalla 'ats' connection, z. B. as zirconium hydride, has not always been satisfactory, since it took a long time to drive out the hydrogen Fntgesengszeitnecessary.

Diese Nachteile werden nun gemäß der Erfindung d-xdurch vermieden, daß auf solchen Stellen; die. zur Wärmeabstrahlung beitragen, kolloidale; hochschmelzende und gasbindende Metalle als Überzüge benutzt werden: Zu diesem Zweck wird das Metall, beispieleweise-Thorium, nach an sich bekannten' Verfahren kolloidal aufgescblämmt und gegebenenfalls durch Dekantieren von den groben Teilen getrennt. Dann kann das Kolloid durch Versprühen oder durch Kataphorese auf die Elektrodenteile aufgebracht werden. Notwendig ist das Dekantieren im allgemeinen nicht, da die Anwesenheit gröberer Teilchen nicht schädlich ist. Durch die Verwendung von kolloidalem Metall an Stelle von grob dispersem Metäll wird die Gefahr des Zusammensinterns oder Schmelzens in auffälliger Weise verhindert: Selbst bei Temperaturen, bei denen sonst stets eine Legierung mit der Unterlage oder ein Blankschmelzen des Überzuges eintrat, bleibt jetzt der Überzug völlig schwarz. An Stelle des vorzugsweise benutzten Tliotriums können im Bedarfsfall auch Zirkon, Titan, Tantal oder Hafnium benutzt werden.These disadvantages are now avoided according to the invention d-x by that on such places; the. contribute to heat radiation, colloidal; high melting point and gas-binding metals are used as coatings: For this purpose, the metal, for example thorium, colloidally bled according to known methods and optionally separated from the coarse parts by decanting. Then it can Colloid applied to the electrode parts by spraying or by cataphoresis will. Decanting is generally not necessary, as the presence is more coarse Particle is not harmful. By using colloidal metal in place coarsely dispersed metal increases the risk of sintering together or melting into conspicuously prevented: Even at temperatures where otherwise always a Alloy with the substrate or a bright melting of the coating occurred, remains now the coating is completely black. Instead of the preferred tliotrium If necessary, zirconium, titanium, tantalum or hafnium can also be used.

In der Abbildung ist schematisch ein, Ausführungßbeispiel für den Gegenstand der Erfindung dargestellt. Es ist i ein beispielsweise aus Nickel oder Eisen bestehendes Anodenblech, auf, dem sich auf der nach außen wärmeabstrahlenden Fläche 2 das kolloidal aufgebrachte Thoriumpulver befindet.In the figure is a schematic, exemplary embodiment for the Subject of the invention shown. It is i a for example made of nickel or Iron existing anode sheet, on which is on the outwardly heat-radiating Area 2 is the colloidally applied thorium powder.

Claims (1)

PATENTANSPRUCH: Nicht als,Glühkathode dienende Elektrode für ein elektrisches Entladungsgefäß, dadurch gekennzeichnet, daß sie wenigstens an den nach außen abstrghlend@en Stellen mit kolloidalem schwarz oder nahezu schwarz strählendem Zirkon, Titan, Tantal, Hafnium oder insbesondere Thorium-bedeckt ist. PATENT CLAIM: Not serving as a hot cathode electrode for an electrical discharge vessel, characterized in that it is covered with colloidal black or almost black zirconium, titanium, tantalum, hafnium or, in particular, thorium, at least at the outwardly emitting areas.
DET2326D 1941-03-15 1941-03-15 Not used as a glow cathode for an electrical discharge vessel Expired DE844029C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DET2326D DE844029C (en) 1941-03-15 1941-03-15 Not used as a glow cathode for an electrical discharge vessel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET2326D DE844029C (en) 1941-03-15 1941-03-15 Not used as a glow cathode for an electrical discharge vessel

Publications (1)

Publication Number Publication Date
DE844029C true DE844029C (en) 1952-07-14

Family

ID=7543797

Family Applications (1)

Application Number Title Priority Date Filing Date
DET2326D Expired DE844029C (en) 1941-03-15 1941-03-15 Not used as a glow cathode for an electrical discharge vessel

Country Status (1)

Country Link
DE (1) DE844029C (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1021499B (en) * 1954-11-16 1957-12-27 Philips Nv Glow discharge tubes
DE1047320B (en) * 1956-04-21 1958-12-24 Gen Electric Process for the production of oxide cathodes for electrical discharge tubes, the carrier metal of which consists of pure nickel
DE1106429B (en) * 1956-03-30 1961-05-10 Radiologie Cie Gle X-ray tube rotating anode
DE1153462B (en) * 1961-04-12 1963-08-29 Westinghouse Electric Corp Indirectly heated cathode for electron tubes and process for manufacturing the cathode

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1021499B (en) * 1954-11-16 1957-12-27 Philips Nv Glow discharge tubes
DE1106429B (en) * 1956-03-30 1961-05-10 Radiologie Cie Gle X-ray tube rotating anode
DE1047320B (en) * 1956-04-21 1958-12-24 Gen Electric Process for the production of oxide cathodes for electrical discharge tubes, the carrier metal of which consists of pure nickel
DE1153462B (en) * 1961-04-12 1963-08-29 Westinghouse Electric Corp Indirectly heated cathode for electron tubes and process for manufacturing the cathode

Similar Documents

Publication Publication Date Title
DE844029C (en) Not used as a glow cathode for an electrical discharge vessel
DE565642C (en) Sealing ring, especially for superheater elements, made of aluminum and a harder metal
DE623235C (en) Resistance body with negative temperature coefficient of electrical resistance
DE3842301A1 (en) Protective high-temperature layer
DE895479C (en) Cathode for electrical discharge vessels
DE744208C (en) Heavy-duty anode for electrical discharge tubes, especially those without artificial cooling
DE858738C (en) Powdery, non-evaporating trapping material for electrical discharge vessels
DE692235C (en) Process for the annealing of alloys for welding electrodes and electrical contacts
DE1090774B (en) Heating element for indirectly heated cathodes and process for the production of an insulating coating
AT215676B (en) Sintered bodies, in particular heating conductors made from molybdenum disilicide and a method for its production
US2165022A (en) Welding rod
DE907093C (en) Process for the production of highly heat-emitting coatings on components of electrical discharge vessels, in particular high-performance short-wave tubes
DE739251C (en) Carbon or graphite electrode for electrical discharge vessels with a coating of a high-melting metal which chemically binds to gas at higher temperatures on at least the surface facing the electron source
DE727337C (en) Outer electrode for electrical discharge vessels, which forms part of the wall of the discharge vessel
DE742505C (en) Process and covering material for the local protection of metal surfaces to be nitrided
AT154986B (en) External electrode for electrical discharge vessels.
DE898187C (en) Electrode for power tubes
DE1521212A1 (en) Process for creating protective layers on metallic objects by diffusing chromium into the surface
DE342992C (en)
DE1133835B (en) Process for the production of an indirectly heated cathode for an electrical discharge tube
DE2003433C3 (en) Wear and corrosion-resistant alloy at high temperatures and use of the same for the production of wear-resistant and corrosion-resistant coatings on components
DE889812C (en) Incandescent cathode for electric discharge tubes
DE591200C (en) Electrically heated hotplate with tubular heating elements cast in a metal of high thermal conductivity but low melting point
DE898224C (en) Process for producing welded joints between copper and steel by arc welding
DE1204493B (en) Process for the production of highly scalable surfaces on heat-resistant materials