DE715156C - Method for applying a coating of zirconium and / or niobium carbide or a coating made from an admixture of these carbides to tantalum carbide on electrodes that are not used for emission - Google Patents

Method for applying a coating of zirconium and / or niobium carbide or a coating made from an admixture of these carbides to tantalum carbide on electrodes that are not used for emission

Info

Publication number
DE715156C
DE715156C DEA83721D DEA0083721D DE715156C DE 715156 C DE715156 C DE 715156C DE A83721 D DEA83721 D DE A83721D DE A0083721 D DEA0083721 D DE A0083721D DE 715156 C DE715156 C DE 715156C
Authority
DE
Germany
Prior art keywords
carbide
coating
admixture
zirconium
electrodes
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
DEA83721D
Other languages
German (de)
Inventor
Dipl-Ing Ernst Woeckel
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
Application filed by AEG AG filed Critical AEG AG
Priority to DEA83721D priority Critical patent/DE715156C/en
Application granted granted Critical
Publication of DE715156C publication Critical patent/DE715156C/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

  • Carbon And Carbon Compounds (AREA)
  • Cold Cathode And The Manufacture (AREA)
  • Solid Thermionic Cathode (AREA)

Description

Verfahren zum Aufbringen eines Überzuges von Zirkon- und/oder Niobcarbid' oder eines Überzuges aus einer Beimengung dieser Carbide zu Tantalcarbid auf nicht zur Emission dienende Elektroden Zusatz zum Patent /-10 283 Im Hauptpatent 710283 ist ein Überzug von Tantalcarbid .auf nicht zur Emission dienenden Elektroden elektrischer Entladungsgefiäße und ein Verfahren zu seiner AufbringUng beschrieben, bei dem zur Vermeidung unenviinschter Emission auf die Elektrode ein Überzug .aus Tantalcarbid aufgesintert wird. Die Eindringtiefe des Kohlenstoffes ist hierbei derart gering, daß ein Kern von< ausreichender Festigkeit vorhanden ist. Ein weiteres Fortschreiten der Karburierung während des Betriebes tritt nicht ein, da die .aufgebrachten Carbidteile nur ,an wenigen Punkten mit dem Kern in Berührung stehen, so daß der zur Diffusion zur Verffigung stehende Querschnitt gering ist. Es hat sich nunmehr herausgestellt, daß das Verfahren nach Patent 710 283 :auch mit Vorteil zur Aufbringung eines Carbidüberzuges, der aus Zirkoncarbid und/oder 1\Iiobcarbid oder ,aus einer Beimengung dieser Garbide zu TantaIcarbld besteht, benutzt werden kann. Nach diesem Verfahren hergestellte Überzüge sind besonders grobkörnig sowie spitzen- und spaltenreich; die wirksame Oberfläche ist daher größer, ,auch ist die Kühlung der Elektroden durch Wärmeabstrahlung wirksamer. Im übrigen kann die Korngröße der Carbidschicht durch geeignete Wahl der Korngröße der aufgetragenen Mischung weitgehend beeinflußt- werden. Die Aufrauhung der Elektroden trägt ferner zusätzlich zum Herabsetzen der Sekundäremission bei. Eine besonders günstige Wirkung zeigte Zirkoncarbid Zum Aufbringen eines Carbidüb.erzuges, der aus Zirkoncarbid und'oder Ni,obcarbid oder aus einer Beimengung dieser Cairbide zu Tantalcarbid besteht, entsprechend dem Verfahren nach dem Hauptpatent 710283, wird nach der Erfindung ,auf den Kern ein Gemisch aus Zirkon und,/oder Niob mit Kohlenstoff oder kohlenstoffhaltigen Verbindungen oder .aus einer Beimengung dieser Metalle zu Tantal mit Kohlenstoff :aufgebracht. Dieses Gemisch wird bis zur Carbidbildung erhitzt, wobei das Carbid gleichzeitig auf der Unterlage festgesintert ist.Process for applying a coating of zirconium and / or niobium carbide or a coating made of an admixture of these carbides to tantalum carbide on non-emission electrodes Electrodes of electrical discharge vessels and a method for applying them are described in which a coating of tantalum carbide is sintered onto the electrode in order to avoid undesired emissions. The depth of penetration of the carbon is so small that a core of sufficient strength is present. The carburization does not proceed further during operation, since the carbide parts applied are only in contact with the core at a few points, so that the cross section available for diffusion is small. It has now been found that the method according to patent 710 283 can also be used with advantage to apply a carbide coating consisting of zirconium carbide and / or aluminum carbide or an admixture of these carbides to tan carbide. Coatings produced according to this process are particularly coarse-grained and have many points and gaps; the effective surface is therefore larger, and the cooling of the electrodes by heat radiation is more effective. In addition, the grain size of the carbide layer can be largely influenced by a suitable choice of the grain size of the applied mixture. The roughening of the electrodes also contributes to reducing secondary emissions. Zirconium carbide had a particularly beneficial effect. To apply a carbide coating consisting of zirconium carbide and Ni, obcarbide or an admixture of these cairbides to tantalum carbide, according to the method according to the main patent 710283, according to the invention, a mixture is applied to the core made of zirconium and / or niobium with carbon or carbon-containing compounds or .from an admixture of these metals to tantalum with carbon: applied. This mixture is heated until carbide is formed, the carbide being sintered onto the base at the same time.

Claims (1)

PATENTANSPRUCH: Anwendung des Verfahrens nach Patent 710 283 zur Aufbringung eines Carbidüberzuges, der .aus Zirkoncarbid undioder Niobcarbidoder aus einer Beimengung dieser Carbide zu Tantalcarbid besteht, auf nicht zur Emission dienende Elektroden, dadurch gekennzeichnet, dar auf die Elektrode ein Gemisch von Zirkün und/oder Ni,ob mit Kohlenstoff oder kohlenst,affhaltigen, vorzugsweise organischen Verbindungen bzw. ein Gemisch von einer Beimengung dieser Metalle zu Tautal mit Kohlenstoff oder kohlenstoffhaltigen Verbindungen aufgetragen und 1»s zur Carbidbildung geglüht wird.PATENT CLAIM: Use of the method according to patent 710 283 for application a carbide coating consisting of zirconium carbide undi or niobium carbide or an admixture this carbide consists of tantalum carbide, on non-emission electrodes, characterized in that a mixture of Zircon and / or Ni, whether on the electrode with carbon or carbon, affine-containing, preferably organic compounds or a mixture of an admixture of these metals to Tautal with carbon or carbon-containing compounds are applied and annealed for 1 »s to form carbide.
DEA83721D 1937-07-23 1937-07-23 Method for applying a coating of zirconium and / or niobium carbide or a coating made from an admixture of these carbides to tantalum carbide on electrodes that are not used for emission Expired DE715156C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEA83721D DE715156C (en) 1937-07-23 1937-07-23 Method for applying a coating of zirconium and / or niobium carbide or a coating made from an admixture of these carbides to tantalum carbide on electrodes that are not used for emission

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEA83721D DE715156C (en) 1937-07-23 1937-07-23 Method for applying a coating of zirconium and / or niobium carbide or a coating made from an admixture of these carbides to tantalum carbide on electrodes that are not used for emission

Publications (1)

Publication Number Publication Date
DE715156C true DE715156C (en) 1941-12-16

Family

ID=6948972

Family Applications (1)

Application Number Title Priority Date Filing Date
DEA83721D Expired DE715156C (en) 1937-07-23 1937-07-23 Method for applying a coating of zirconium and / or niobium carbide or a coating made from an admixture of these carbides to tantalum carbide on electrodes that are not used for emission

Country Status (1)

Country Link
DE (1) DE715156C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE965857C (en) * 1951-05-23 1957-06-27 Int Standard Electric Corp Process for the production of non-emitting electrodes for electrical discharge vessels
DE967715C (en) * 1952-04-01 1957-12-05 Gen Electric Indirectly heated thorium cathode for electrical discharge tubes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE965857C (en) * 1951-05-23 1957-06-27 Int Standard Electric Corp Process for the production of non-emitting electrodes for electrical discharge vessels
DE967715C (en) * 1952-04-01 1957-12-05 Gen Electric Indirectly heated thorium cathode for electrical discharge tubes

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