AT127569B

AT127569B - Method for introducing barium into electrical discharge vessels.

Info

Publication number: AT127569B
Authority: AT
Original assignee: Aeg
Priority date: 1929-08-20
Filing date: 1930-08-18
Publication date: 1932-04-11

Description

  

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  Verfahren zur Einbringung von Barium in elektrische   Entladungsgefässe.   
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   Für manche Zwecke hat es sich als vorteilhaft erwiesen, das beschriebene Temper-oder Schmelzverfahren in kleinen Behältern oder in den mit entsprechenden Vertiefungen versehenen Elektroden, die z. B. aus Nickel oder Molybdän oder andern höher schmelzenden Metallen hergestellt sind, vorzunehmen und die mit dem behandelten Barium gefüllten kleinen Gefässen oder Elektroden in die Röhre einzubringen. 



   Auch kann man zwecks Verwendung des Bariums in den Röhren so vorgehen, dass man das Metall nach der Wärmebehandlung zunächst mit Paraffinöl od. dgl. in einer Porzellankugelmühle zu einer Aufschlämmung vermahlt und diese auf die Anodenbleche aufpinselt. Das Paraffinöl verdampft beim Pumpen der Röhre und hinterlässt das Barium in Form eines feinen Überzuges. Man kann ferner auf diese Weise hergestelltes Bariummetallpulver auf der Pastillenpresse zu Presslingen von bestimmter Grösse verarbeiten, wobei es auch in diesem Falle zweckmässig ist, etwas Paraffinöl od. dgl. zuzusetzen. 



   Die Vorteile des neuen Verfahrens sind kurz folgende : Durch die beschriebene Behandlung des Bariummetalls wird es möglich, das Bariummetall als solches in die Röhren einzuführen, u. zw. in so einfacher Weise, dass sich auch eine Massenanfertigung ohne Schwierigkeiten bewerkstelligen lässt. Das für die Entwicklung einer hinreichenden Menge Bariumdampf in die Röhre einzuführende Metallstück ist so klein, dass es sich ohne Schwierigkeiten an den Elektroden oder besonderen Trägern anbringen lässt. 



  Das Barium kann durch Erhitzen auf   600-700  C schnell   verdampft werden, wodurch ein rasches Entlüften der Röhren auf selbsttätig arbeitenden Vorrichtungen ermöglicht wird. 



   PATENT-ANSPRÜCHE :
1. Verfahren zur Einbringung von Barium in elektrische Entladungsgefässe, bei dem das Barium in Metallform eingeführt wird, dadurch gekennzeichnet, dass das metallische Barium vor seiner Verwendung durch Erhitzen bis mindestens nahe an den Schmelzpunkt und anschliessendes genügend schnelles Abkühlen in einen gegen chemische Einflüsse, insbesondere gegen Oxydation, beständigeren Zustand übergeführt wird.



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  Process for introducing barium into electrical discharge vessels.
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   For some purposes, it has proven to be advantageous to carry out the described tempering or melting process in small containers or in the electrodes provided with corresponding depressions, which are e.g. B. made of nickel or molybdenum or other higher melting metals are to be made and the small vessels or electrodes filled with the treated barium are to be introduced into the tube.



   To use the barium in the tubes, one can also proceed in such a way that, after the heat treatment, the metal is first ground with paraffin oil or the like in a porcelain ball mill to form a slurry and this is brushed onto the anode sheets. The paraffin oil evaporates when the tube is pumped and leaves the barium in the form of a fine coating. In addition, barium metal powder produced in this way can be processed into pellets of a certain size on the lozenge press, in which case it is also advisable to add some paraffin oil or the like.



   Briefly, the advantages of the new process are as follows: The treatment of the barium metal described makes it possible to introduce the barium metal as such into the tubes, and in such a simple way that even mass production can be accomplished without difficulty. The metal piece to be introduced into the tube in order to generate a sufficient amount of barium vapor is so small that it can be attached to the electrodes or special supports without difficulty.



  The barium can be quickly evaporated by heating it to 600-700 C, which enables quick venting of the tubes on automatic devices.



   PATENT CLAIMS:
1. A method for introducing barium into electrical discharge vessels, in which the barium is introduced in metal form, characterized in that the metallic barium is heated to at least close to the melting point and then cooled sufficiently quickly to protect against chemical influences, in particular against oxidation, more stable state is transferred.

Claims

2. The method according to claim 1, characterized in that metallic barium is converted into a less vulnerable state by distillation at temperatures above 11500 in a high vacuum or in noble gas.

3. The method according to claim 1 or 2, characterized in that barium metal is used with a metal content of at least 98%.

4. The method according to claim 1 or the following, characterized in that the barium metal is coated after the heat treatment with a highly viscous liquid which evaporates undecomposed as possible at temperatures from 150 to 4000 C and does not noticeably attack the metal.

5. The method according to claim 1 or the following, characterized in that the barium metal after the heat treatment to form threads, strips or the like. Is pressed or rolled, expediently with protective coatings of paraffin oil or the like.

6. The method according to claim 1 or the following, characterized in that barium metal after the heat treatment, optionally with the addition of highly viscous oils, such as paraffin oil, in the form of pellets of a certain size, e.g. B. on the lozenge press, made of sufficiently fine powder and placed in discharge tubes.

7. The method according to claim 1 or the following, characterized in that the heat treatment of the barium metal is carried out in small vessels (tubes) made of nickel or molybdenum or other higher melting metals, whereupon the vessels filled with the metallic barium can be introduced into the tubes.

8. The method according to claim 1 or the following, characterized in that the heat treatment is carried out in vessel-like enlargements of the electrodes.

9. The method according to claim 1 or the following, characterized in that barium metal after the heat treatment with a highly viscous, non-corrosive liquid, such as. B. paraffin oil, converted by grinding in ball mills or by similar processing in the form of a slurry and placed in the tubes, e.g. B. brushed onto the anode sheets, is.