CH217145A - Process for the production of coatings with high heat radiation capacity and low secondary emission in discharge tubes. - Google Patents

Process for the production of coatings with high heat radiation capacity and low secondary emission in discharge tubes.

Info

Publication number
CH217145A
CH217145A CH217145DA CH217145A CH 217145 A CH217145 A CH 217145A CH 217145D A CH217145D A CH 217145DA CH 217145 A CH217145 A CH 217145A
Authority
CH
Switzerland
Prior art keywords
coatings
production
discharge tubes
secondary emission
low secondary
Prior art date
Application number
Other languages
German (de)
Inventor
Aktiengesellschaft C Lorenz
Original Assignee
Lorenz C 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 Lorenz C Ag filed Critical Lorenz C Ag
Publication of CH217145A publication Critical patent/CH217145A/en

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
    • H01J19/28—Non-electron-emitting electrodes; Screens
    • H01J19/30—Non-electron-emitting electrodes; Screens characterised by the material
    • 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

Description

  

      Zusatzpatent    zum Hauptpatent Nr. 209022.    Verfahren zur Herstellung von Überzügen mit hoher     Wärmestrahlungsfähigkeit     und geringer     Sekundäremission    in Entladungsröhren.    Im Hauptpatent Nr. 209022     ist    ein Ver  fahren vorgeschlagen worden zur Herstellung  von Überzügen mit hoher     Wärmestrahlungs-          fähigkeit    und geringer Sekundäremission in  Entladungsröhren, wobei auf der Unterlage,  z. B. auf der Anode, eine hochschmelzendes       Carbid,    z.

   B.     Zirkoncarbid,        Wolframcarbid,          Molybdänearbid,        Borcarbid    oder Silicium  carbid, enthaltende Schicht erzeugt wird.  



  Es wurde ferner vorgeschlagen, diese  Schicht durch Aufspritzen einer     Emulsion     herzustellen. Ferner können die Schichten auf  dem Trägermaterial festgesintert werden. Die  Herstellung von Metallüberzügen, bei denen  nachträglich eine     Überführung    in     Carbid    er  folgt, kann durch Spritzen,     gathodenzerstäu-          bung    oder Verdampfung der Metalle     bezw.     entsprechender Verbindungen erfolgen.  



  Nach vorliegender     Erfindung    soll nun  eine aus hochschmelzenden     Carbiden    beste-         hende    Schicht auf     elektrophoretischem    Wege  auf die Unterlage aufgebracht werden.  



  Diese Art der Aufbringung hat den Vor  teil, dass sich erstens immer gleiche Mengen  von     Schwärzungsmasse        aufbringen    lassen.  Des     weiteren    treten gegenüber dem gebräuch  lichen Verfahren, die     Schwärzungsmasse    zu  spritzen,     keinerlei    Materialverluste auf.

   Auch  lassen sich durch Elektrophorese immer glei  che Oberflächen herstellen, im Gegensatz zum  Spritzen, bei dem die Gleichmässigkeit der  strahlenden Oberfläche stärker     variiert.    Von  ganz besonderem Vorteil ist, dass die     elektro-          phoretisch    aufgebrachte Masse     vollkommen     festsitzt, so dass sieh die weitere Verarbei  tung wesentlich einfacher gestaltet als     bei    ge  spritzten Schichten. Auch ist die Gasabgabe       elektrophoretisch    aufgebrachter Schichten  bedeutend geringer, da die Trägerlösung ohne  Bindemittel angesetzt werden kann.



      Additional patent to main patent no. 209022. Process for the production of coatings with high thermal radiation capacity and low secondary emission in discharge tubes. In the main patent no. 209022, a process has been proposed for the production of coatings with high thermal radiation capacity and low secondary emission in discharge tubes, with on the base, z. B. on the anode, a refractory carbide, e.g.

   B. zirconium carbide, tungsten carbide, molybdenum carbide, boron carbide or silicon carbide containing layer is generated.



  It has also been proposed to produce this layer by spraying on an emulsion. Furthermore, the layers can be firmly sintered on the carrier material. The production of metal coatings, which are subsequently converted into carbide, can be carried out by spraying, gathodenzerstäu- or evaporation of the metals. corresponding connections are made.



  According to the present invention, a layer consisting of high-melting carbides is now to be applied to the substrate by electrophoretic means.



  This type of application has the advantage that, firstly, the same amounts of blackening compound can always be applied. Furthermore, there are no material losses compared to the common method of spraying the blackening compound.

   The same surfaces can always be produced by electrophoresis, in contrast to spraying, in which the uniformity of the radiating surface varies more widely. It is particularly advantageous that the electrophoretically applied compound is completely fixed, so that further processing is much easier than with sprayed layers. The gas release of electrophoretically applied layers is also significantly lower, since the carrier solution can be prepared without a binder.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung von Überzügen mit hoher Wärmestrahlungsfähigkeit und ge ringer Sekundäremission in Entladungsröh ren nach dem Patentanspruch des Haupt patentes, dadurch gekennzeichnet, dass eine aus hochschmelzenden Carbiden bestehende Schicht auf elektrophoretischem Wege auf die Unterlage aufgebracht wird. PATENT CLAIM: Process for the production of coatings with high thermal radiation capacity and low secondary emission in discharge tubes according to the claim of the main patent, characterized in that a layer consisting of high-melting carbides is applied to the substrate by electrophoresis.
CH217145D 1939-03-18 1940-03-11 Process for the production of coatings with high heat radiation capacity and low secondary emission in discharge tubes. CH217145A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE217145X 1939-03-18
CH209022T 1940-03-11

Publications (1)

Publication Number Publication Date
CH217145A true CH217145A (en) 1941-09-30

Family

ID=25724655

Family Applications (1)

Application Number Title Priority Date Filing Date
CH217145D CH217145A (en) 1939-03-18 1940-03-11 Process for the production of coatings with high heat radiation capacity and low secondary emission in discharge tubes.

Country Status (1)

Country Link
CH (1) CH217145A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2516841A (en) * 1946-01-16 1950-08-01 Standard Telephones Cables Ltd Grid for electron discharge devices
DE1021502B (en) * 1956-02-01 1957-12-27 Philips Nv Process for producing electrodes with low thermal emission for electrical discharge tubes and electrical discharge tubes with at least one electrode produced by this process
DE1022700B (en) * 1955-11-19 1958-01-16 Varian Associates Metallic component for electron tubes
DE1051991B (en) * 1956-10-29 1959-03-05 Philips Nv Process for producing an electrical discharge tube with at least one electrode with low thermal emission and electrical discharge tubes produced by this process

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2516841A (en) * 1946-01-16 1950-08-01 Standard Telephones Cables Ltd Grid for electron discharge devices
DE1022700B (en) * 1955-11-19 1958-01-16 Varian Associates Metallic component for electron tubes
DE1021502B (en) * 1956-02-01 1957-12-27 Philips Nv Process for producing electrodes with low thermal emission for electrical discharge tubes and electrical discharge tubes with at least one electrode produced by this process
DE1051991B (en) * 1956-10-29 1959-03-05 Philips Nv Process for producing an electrical discharge tube with at least one electrode with low thermal emission and electrical discharge tubes produced by this process

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