CH132146A - Electric incandescent lamp with a luminous element which at least partially consists of a carbide of a metal from the tantalum group. - Google Patents
Electric incandescent lamp with a luminous element which at least partially consists of a carbide of a metal from the tantalum group.Info
- Publication number
- CH132146A CH132146A CH132146DA CH132146A CH 132146 A CH132146 A CH 132146A CH 132146D A CH132146D A CH 132146DA CH 132146 A CH132146 A CH 132146A
- Authority
- CH
- Switzerland
- Prior art keywords
- carbide
- incandescent lamp
- metal
- tantalum
- luminous element
- Prior art date
Links
Description
Elektrische Glühlampe mit einem Leuchtkörper, der mindestens zum Teil aus einem Karbid eines Netalles der Tantalgruppe bestellt. Gegenstand vorliegender Erfindung bildet eine elektrische Glühlampe mit einem Leucht- körper, welcher mindestens zum Teil aus einem Karbid eines Metalles der Tantal- gruppe besteht, dadurch gekennzeichnet, dass die Glühlampe eine Füllung mit gegen das Karbid inerten Gasen enthält.
Der Leucht- körper kann aus einem Karbid des Tantals oder eines. Metalles der Tantalgruppe, ge gebenenfalls mit einer Seele dieses Metalles, bestehen.
Leuchtkörper aus einem Karbid eines Metalles der Tantalgruppe, gegebenenfalls mit einer Seele dieses Metalles sind wegen ihres hohen elektrischen Widerstandes und ihres hohen Schmelzpunktes bereits in der britischen Patentschrift Nr. 8840, 1906 vor geschlagen; sie haben sich jedoch nicht be währt, weil das Karbid bei höherer Tem peratur den Kohlenstoff wieder abgibt und sich in das Metall der Tantalgruppe rück verwandelt.
Gemäss vorliegender Erfindung enthält die Lampe zwecks Verminderung der Zer setzung des Karbides eines Metalles der Tan- talgruppe eine Füllung von einem gegen das Karbid inertem Gas, z. B. reinem Argon. Während des Brennens der Lampe entsteht im Innern derselben infolge der Erhitzung des Füllgases ein Überdruck, durch welchen das Austreten des Kohlenstoffes aus dem Karbid vermindert, d. h. verlangsamt und so die Lebensdauer des Fadens verlängert wird.
Hierbei hat es sich auch als zweckmässig erwiesen, dem Leuchtkörper aus Tantalkarbid zwecks Verminderung der Wärmeabfuhr die Form eng aneinanderliegender, z. B. schrau- benlinienförmiger Windungen zu geben, wie solches bereits für andere Leuchtkörper in' der französischen Patentschrift Nr. 298 653, 1900 vorgeschlagen wurde.
Electric incandescent lamp with a luminous body, which is at least partially made of a carbide of a metal of the tantalum group. The subject matter of the present invention is an electric incandescent lamp with a luminous element which consists at least partially of a carbide of a metal of the tantalum group, characterized in that the incandescent lamp contains a filling with gases inert to the carbide.
The luminous body can consist of a carbide of tantalum or a. Metal of the tantalum group, if necessary with a soul of this metal, exist.
Luminous bodies made of a carbide of a metal of the tantalum group, possibly with a core of this metal, have already been proposed in British Patent No. 8840, 1906 because of their high electrical resistance and high melting point; However, they have not proven their worth because the carbide releases the carbon again at higher temperatures and is converted back into the metal of the tantalum group.
According to the present invention, in order to reduce the decomposition of the carbide of a metal of the tantalum group, the lamp contains a filling of a gas which is inert to the carbide, e.g. B. pure argon. While the lamp is burning, an overpressure is created inside the lamp as a result of the heating of the filling gas, which reduces the escape of carbon from the carbide, i.e. H. slowed down, thus extending the life of the thread
It has also proven to be expedient to give the luminous body made of tantalum carbide the shape of a closely spaced, z. B. to give helical turns, as has already been proposed for other luminous bodies in French Patent No. 298 653, 1900.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT132146X | 1927-03-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH132146A true CH132146A (en) | 1929-03-31 |
Family
ID=3637269
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH132146D CH132146A (en) | 1927-03-09 | 1928-02-23 | Electric incandescent lamp with a luminous element which at least partially consists of a carbide of a metal from the tantalum group. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH132146A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2450007A (en) * | 1942-11-23 | 1948-09-28 | Standard Telephones Cables Ltd | Carburized filament and method for treating the same |
-
1928
- 1928-02-23 CH CH132146D patent/CH132146A/en unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2450007A (en) * | 1942-11-23 | 1948-09-28 | Standard Telephones Cables Ltd | Carburized filament and method for treating the same |
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