DE584118C - Process for the production of incandescent cathodes, in which a metallic coating is attached to an insulating layer - Google Patents

Process for the production of incandescent cathodes, in which a metallic coating is attached to an insulating layer

Info

Publication number
DE584118C
DE584118C DER72338D DER0072338D DE584118C DE 584118 C DE584118 C DE 584118C DE R72338 D DER72338 D DE R72338D DE R0072338 D DER0072338 D DE R0072338D DE 584118 C DE584118 C DE 584118C
Authority
DE
Germany
Prior art keywords
attached
production
insulating layer
metallic coating
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
DER72338D
Other languages
German (de)
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.)
RADIO ROEHREN LAB DR NICKEL G
Original Assignee
RADIO ROEHREN LAB DR NICKEL G
Publication date
Priority to DER72338D priority Critical patent/DE584118C/en
Application granted granted Critical
Publication of DE584118C publication Critical patent/DE584118C/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

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Coating By Spraying Or Casting (AREA)

Description

Die Erfindung bezieht sich auf Glühkathoden, bei denen ein auf galvanischem Wege hergestellter Metallüberzug auf einer isolierenden Unterlage vorhanden ist. Gewöhnlich werden derartige Metallüberzüge dadurch hergestellt, daß die isolierende Unterlage mit Graphitstaub bedeckt und dann einem GaI-vanisierungsprozeß unterzogen wird. Es hat sich nun gezeigt, daß die Anwesenheit des Kohlenstoffes die Wirkungsweise des Entladungsgefäßes verschlechtert. Vermutlich ist dies auf chemische Reaktionen des Kohlenstoffes mit anderen zur Verwendung kommenden Substanzen, wie Sauerstoff, Barium usw., zurückzuführen.The invention relates to hot cathodes, in which a galvanic way produced metal coating is present on an insulating base. Usually such metal coatings are produced in that the insulating substrate with Graphite dust is covered and then subjected to a GaI vanization process. It has it has now been shown that the presence of carbon is the mode of operation of the discharge vessel worsened. Presumably this is due to chemical reactions of the carbon with others coming into use Substances such as oxygen, barium, etc., to be traced back.

Auch hat man auf dem Isolierkörper zunächst durch chemischen Niederschlag eine Metallschicht erzeugt und diese dann galvanisch verstärkt. Dabei werden jedoch vonYou also have a chemical precipitate on the insulating body Metal layer generated and then reinforced galvanically. However,

ao dem Isolierkörper chemische Substanzen aufgenommen, die auf die Emissions- und Entgasungsfähigkeit der Kathode nachteilig einwirken. ao the insulating body added chemical substances that affect the emission and degassing ability adversely affect the cathode.

Erfindungsgemäß wird nun die Metallschicht auf dem Isolierkörpern dadurch erzeugt, daß zunächst ein leitender Überzug b durch Bestäuben des Isolierkörpers mit Metallpulver aufgebracht und dieser dann in bekannter Weise galvanisch verstärkt wird. Es ist zweckmäßig, den ersten. leitenden Überzug b aus demselben Metall herzustellen wie die galvanische Verstärkungsschicht c. Die Abb. ι und 2 zeigen eine nach dem erfindungsgemäßen Verfahren hergestellte Glühkathode im Quer- und Längsschnitt.According to the invention, the metal layer is now produced on the insulating body in that first a conductive coating b is applied by dusting the insulating body with metal powder and this is then galvanically reinforced in a known manner. It is convenient the first. make conductive coating b from the same metal as the galvanic reinforcement layer c. Figs. Ι and 2 show a hot cathode produced by the method according to the invention in cross section and longitudinal section.

Gegenüber dem bekannten Verfahren, bei dem geschmolzenes Metall aufgespritzt wird, ist es dem Verfahren gemäß der Erfindung eigen, daß man den metallischen Überzug auch auf Flächen mit sehr kleinem Krümmungsradius aufbringen kann, was gerade für die Herstellung von Kathoden von größter Bedeutung ist.Compared to the known method in which molten metal is sprayed on, it is peculiar to the method according to the invention that the metallic coating can also apply to surfaces with a very small radius of curvature, which is straight is of utmost importance for the manufacture of cathodes.

Es wird darauf hingewiesen, daß bereits vorgeschlagen wurde, bei Glühkathoden, bei denen ein metallischer Überzug auf einer Isolierschicht befestigt ist, diesen Metallüberzug durch Auftragen des Metalls als feinstes Pulver herzustellen. Bei dem erfindungsgemäßen Verfahren wird im Gegensatz hier- g0 zu durch das Auftragen des Metallpulvers nur die Unterlage für den eigentlichen, auf galvanischem Wege hergestellten Metallüberzug erzeugt.It is pointed out that it has already been proposed, in the case of hot cathodes in which a metallic coating is attached to an insulating layer, to produce this metal coating by applying the metal as the finest powder. In the inventive method, in contrast here- 0 g, produced by applying to the metal powder, only the base for the actual galvanically produced metal coating.

Claims (2)

Patentansprüche:Patent claims: ι. Verfahren zur Herstellung von Glühkathoden, bei denen ein metallischer Überzug auf einer Isolierschicht befestigt ist, Q0 dadurch gekennzeichnet, daß zunächst ein leitender Überzug durch Bestäuben des Isolierkörpers mit Metallpulver erzeugt und dieser dann in bekannter Weise galvanisch verstärkt wird. -ggι. Process for the production of hot cathodes in which a metallic coating is attached to an insulating layer, Q 0 characterized in that first a conductive coating is produced by dusting the insulating body with metal powder and this is then galvanically reinforced in a known manner. -gg 2. Verfahren nach Anspruch i, dadurch gekennzeichnet, daß die galvanische Verstärkungsschicht aus demselben Material hergestellt ist wie der erste leitende Überzug- 2. The method according to claim i, characterized in that the galvanic reinforcement layer is made of the same material as the first conductive coating Hierzu 1 Blatt Zeichnungen1 sheet of drawings
DER72338D Process for the production of incandescent cathodes, in which a metallic coating is attached to an insulating layer Expired DE584118C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DER72338D DE584118C (en) Process for the production of incandescent cathodes, in which a metallic coating is attached to an insulating layer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DER72338D DE584118C (en) Process for the production of incandescent cathodes, in which a metallic coating is attached to an insulating layer

Publications (1)

Publication Number Publication Date
DE584118C true DE584118C (en) 1933-09-15

Family

ID=7414358

Family Applications (1)

Application Number Title Priority Date Filing Date
DER72338D Expired DE584118C (en) Process for the production of incandescent cathodes, in which a metallic coating is attached to an insulating layer

Country Status (1)

Country Link
DE (1) DE584118C (en)

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