CH209750A - Method of manufacturing a discharge tube. - Google Patents
Method of manufacturing a discharge tube.Info
- Publication number
- CH209750A CH209750A CH209750DA CH209750A CH 209750 A CH209750 A CH 209750A CH 209750D A CH209750D A CH 209750DA CH 209750 A CH209750 A CH 209750A
- Authority
- CH
- Switzerland
- Prior art keywords
- alkaline earth
- decomposition
- oxide
- coating
- discharge tube
- Prior art date
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
- H01J19/42—Mounting, supporting, spacing, or insulating of electrodes or of electrode assemblies
- H01J19/44—Insulation between electrodes or supports within the vacuum space
Description
Verfahren zur Herstellung einer Entladungsröhre. Der Isolationszustand zwischen den span nungsführenden Leitungen von Entladungs röhren wird häufig dadurch gestört, dass sich zwischen den Leitungen Metall niederschlägt, das in der Röhre zum Beispiel als Getter- material dient. Durch grosse Abstände zwi schen den spannungsführenden Teilen lässt sich dieser Nachteil in gewissem Masse ver ringern.
Es ist vorgeschlagen worden, den Isola tionswert zwischen den spannungsführenden Einschmelzdräbten dadurch zu erhöhen, dass die betreffenden Oberflächen mit einem Über zug aus einem Erdalkalioxyd versehen werden. Dieses Verfahren hat den Nachteil, dass bei der Herstellung, die im allgemeinen durch Erhitzung eines aufgebrachten Erdalkalicar- bonats während des Evakuierens erfolgt, nur verhältnismässig niedrige Temperaturen ver wendet werden können, so dass ein sehr langer Zeitraum verstreichen muss, bis das betreffende Carbonat in Oxyd umgewandelt ist.
Gegenstand der vorliegenden Erfindung ist nun ein Verfahren zur Herstellung einer Entladungsröhre, bei welcher zwischen den spannungsführenden Leitungen ein isolieren der, Erdalkalioxyd enthaltender Überzug vor handen ist, welches Verfahren dadurch gekenn zeichnet ist, dass die Bildung des Erdalkali- oxydüberzuges durch Zersetzung einer Erdal- kaliverbindung unter Zusatz eines diese Zer setzung beschleunigenden Stoffes erfolgt.
Als Stoffe, die die Zersetzung der Erdal- kaliverbindung, beispielsweise Erdalkalicar- bonat, beschleunigen, eignen sich besonders Oxyde, wie Aluminiumoxyd oder Silicium dioxyd.
Die Beschleunigung des Zersetzungsvor ganges welcher, wie bereits bekannt, während des Evakuierens erfolgen kann ist wahr scheinlich durch die Bildung von Verbin dung zwischen den Stoffen, zum Beispiel bei Verwendung einer Magnesiumverbindung als Grrundstoff und A1203 als Zusatz durch die Bildung von Spinell (MgO A12 03), zu erklären.
Es ist nicht notwendig, die der stöchiome- trischen Zusammensetzung entsprechenden Mengenverhältnisse zu wählen, sondern es genügen schon Zusätze von 1 /o, um die Zersetzungsgeschwindigkeit wesentlich zu steigern.
Method of manufacturing a discharge tube. The state of insulation between the voltage-carrying lines of discharge tubes is often disturbed by the fact that metal is deposited between the lines and is used as getter material in the tube, for example. This disadvantage can be reduced to a certain extent by large distances between the live parts.
It has been proposed to increase the insulation value between the live fuse wires in that the surfaces concerned are provided with a coating of an alkaline earth oxide. This process has the disadvantage that in the production, which generally takes place by heating an applied alkaline earth carbonate during evacuation, only relatively low temperatures can be used, so that a very long period of time has to elapse before the carbonate in question is in oxide is converted.
The present invention now relates to a process for producing a discharge tube, in which an isolating coating containing alkaline earth oxide is present between the voltage-carrying lines, which process is characterized in that the formation of the alkaline earth oxide coating is formed by the decomposition of an alkaline earth compound takes place with the addition of this decomposition accelerating substance.
Oxides such as aluminum oxide or silicon dioxide are particularly suitable as substances which accelerate the decomposition of the alkaline earth compound, for example alkaline earth carbonate.
The acceleration of the decomposition process, which, as already known, can take place during evacuation, is probably due to the formation of compounds between the substances, for example when using a magnesium compound as the basic material and A1203 as an additive through the formation of spinel (MgO A12 03 ), to explain.
It is not necessary to choose the proportions corresponding to the stoichiometric composition, but additions of 1 / o are sufficient to substantially increase the rate of decomposition.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE209750X | 1937-09-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH209750A true CH209750A (en) | 1940-04-30 |
Family
ID=5794940
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH209750D CH209750A (en) | 1937-09-25 | 1938-09-02 | Method of manufacturing a discharge tube. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH209750A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE964793C (en) * | 1951-06-08 | 1957-05-29 | Ets Claude Paz & Silva | Electrode for electrical gas or vapor discharge apparatus |
DE969552C (en) * | 1951-04-25 | 1958-06-19 | Standard Elek K Ag | Process for the production of capacitor dielectrics from materials with high dielectric constants |
US3041210A (en) * | 1959-12-02 | 1962-06-26 | Tung Sol Electric Inc | Method of making cold cathodes for vacuum tubes and article |
-
1938
- 1938-09-02 CH CH209750D patent/CH209750A/en unknown
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE969552C (en) * | 1951-04-25 | 1958-06-19 | Standard Elek K Ag | Process for the production of capacitor dielectrics from materials with high dielectric constants |
DE964793C (en) * | 1951-06-08 | 1957-05-29 | Ets Claude Paz & Silva | Electrode for electrical gas or vapor discharge apparatus |
US3041210A (en) * | 1959-12-02 | 1962-06-26 | Tung Sol Electric Inc | Method of making cold cathodes for vacuum tubes and article |
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