DE872606C - Process for the production of grids for electron tubes - Google Patents

Process for the production of grids for electron tubes

Info

Publication number
DE872606C
DE872606C DEL5026D DEL0005026D DE872606C DE 872606 C DE872606 C DE 872606C DE L5026 D DEL5026 D DE L5026D DE L0005026 D DEL0005026 D DE L0005026D DE 872606 C DE872606 C DE 872606C
Authority
DE
Germany
Prior art keywords
grids
production
electron tubes
molybdenum
tungsten
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
DEL5026D
Other languages
German (de)
Inventor
Felix Dr Herriger
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.)
Alcatel Lucent Deutschland AG
Original Assignee
Standard Elektrik Lorenz 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 Standard Elektrik Lorenz AG filed Critical Standard Elektrik Lorenz AG
Priority to DEL5026D priority Critical patent/DE872606C/en
Application granted granted Critical
Publication of DE872606C publication Critical patent/DE872606C/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

Landscapes

  • Powder Metallurgy (AREA)

Description

Verfahren zur Herstellung von Gittern für Elektronenröhren Es ist bekannt, daß zur Verringerung der Sekundäremission die Gitter bestimmten Verfahren unterworfen -werden. Beispielsweise werden bei einem bekannten Verfahren Überzüge auf die Gitterdrähte aufgebracht, wobei stets die Gefahr bestand, daß beim Auftreten hoher elektrischer Feldkräfte einzelne Teilchen von :der Oberfläche herausgerissen wurden.Method of making grids for electron tubes It is known that to reduce the secondary emission, the grid certain methods to be subjected. For example, in one known method, coatings are used applied to the grid wires, there was always the risk that when it occurred high electric field forces individual particles torn from the surface became.

Genauere Untersuchungen über die Sekundäremission haben gezeigt, daß vor allen Dingen die Oberflächenbeschaffenheit, z. B. glatt oder rauh, wesentlich für die Ausbeute an Sekurüdärelektronen ist. Die geringste Sekundäremission zeigt Kohlekörper, die ein sehr poröses Gefüge haben. Es wird vorgeschlagen, die Sekundäremission von mit einer porösen Metallschicht versehenen Gittern dadurch zu verringern, daß erfindungsgemäß eine Metallschicht aus Wolfram-Molybdän-Pulver und einem Bindemittel besteht und auf dem Gitterdraht aufgesintert wird.More detailed studies of the secondary emission have shown that above all the surface properties, e.g. B. smooth or rough, essential for the yield of secondary electrons. The lowest secondary emission shows Carbon bodies, which have a very porous structure. It is suggested the secondary emission of grids provided with a porous metal layer in that according to the invention a metal layer made of tungsten-molybdenum powder and a binder and is sintered onto the grid wire.

Das Aufbringen der porösen Sinterschicht auf den Gitterdraht kann beispielsweise folgendermaßen erfolgen: Auf die Gitterdrähte wird durch Spritzen ein Gemisch aus Wolfram-Molybdän-Pulver und einem Bindemittel (Paraffin in- Xylol, gelöst) aufgetragen. Sodann wird der ganze Gitterkörper in einer Schutzgasatmosphäre bei ungefähr i2oo bis i5oo"C gesintert. Um nun eine noch porösere Oberfläche zu erhalten, kann man die Molybdänteilchen# aus dem §interkörper chemisch herauslösen, so daß nur ein Wolframgerippe stehenbleibt Aber auch der Sinterkörper aus Wolfram und Molybdärt ist sehr porös und zeigt eine geringe Sekundäremis-Sion.The application of the porous sintered layer to the grid wire can For example, it can be done as follows: The grid wires are sprayed onto a mixture of tungsten-molybdenum powder and a binder (paraffin inxylene, dissolved) applied. The entire grid body is then placed in a protective gas atmosphere sintered at around i2oo to i5oo "C. To now have an even more porous surface to obtain, the molybdenum particles # can be chemically removed from the internal body, so that only a tungsten skeleton remains. But also the sintered body made of tungsten and molybdenum is very porous and shows little secondary emission.

Claims (2)

PATENTANSPRÜCHE: i. Verfahren zür Herstellung von Gittern für Elektronenröhren, deren Sekundäremissioti durch Aufbringen einier porösen Metallscli#cüt verringert ist, dadurch gekennzeichnet, daß die Metallschicht-- aus #Wolfram-Molybdän-Pulver Bund einem Bindemittel besteht und auf dem Gitterdraht aufgesintert wird. PATENT CLAIMS: i. Process for the production of grids for electron tubes, their secondary emissions are reduced by applying a porous metal clip is, characterized in that the metal layer - made of # tungsten-molybdenum powder Bund consists of a binding agent and is sintered onto the grid wire. 2. Verfahren nach-Anspruch i, dadurch gekennzeichnet, daß als Bindemittel für den Sinterkörper in Xylol gelöstes Paraffin verwendet wird. 3. Verfahren nach Anspruch i und 2, dadurch ..gekennzeichnet, #daß das Molybdän nach dem Sintern chemisch herausgelöst wird.2. The method according to claim i, characterized in that paraffin dissolved in xylene is used as a binder for the sintered body. 3. The method according to claim i and 2, characterized .. characterized # that the molybdenum is chemically dissolved out after sintering.
DEL5026D 1938-12-03 1938-12-03 Process for the production of grids for electron tubes Expired DE872606C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEL5026D DE872606C (en) 1938-12-03 1938-12-03 Process for the production of grids for electron tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL5026D DE872606C (en) 1938-12-03 1938-12-03 Process for the production of grids for electron tubes

Publications (1)

Publication Number Publication Date
DE872606C true DE872606C (en) 1953-04-02

Family

ID=7256689

Family Applications (1)

Application Number Title Priority Date Filing Date
DEL5026D Expired DE872606C (en) 1938-12-03 1938-12-03 Process for the production of grids for electron tubes

Country Status (1)

Country Link
DE (1) DE872606C (en)

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