AT116825B - Method of manufacturing an incandescent body. - Google Patents
Method of manufacturing an incandescent body.Info
- Publication number
- AT116825B AT116825B AT116825DA AT116825B AT 116825 B AT116825 B AT 116825B AT 116825D A AT116825D A AT 116825DA AT 116825 B AT116825 B AT 116825B
- Authority
- AT
- Austria
- Prior art keywords
- incandescent
- manufacturing
- incandescent body
- thorium oxide
- tungsten
- Prior art date
Links
Landscapes
- Discharge Lamp (AREA)
Description
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Verfahren zur Herstellung eines Glühkörpers.
Die Erfindung betrifft ein Verfahren zur Herstellung eines Glühkörpers.
Glühkörper, die aus einem hochschmelzenden Metall, z. B. aus Wolfram bestehen, das eine Metallverbindung, wie Thoriumoxyd enthält, sind schon längst bekannt. Ein derartiger Glühkörper kann als Glühfaden in einer Glühlampe und nach Aktivierung auch als Elektronenaussender in einer elektrischen Entladungsröhre verwendet werden.
Die Erfindung bezweckt die Herstellung solcher Glühkorper mit grosser Lichtausstrahlung, falls sie als Glühfaden in einer Glühlampe, oder mit hoher Elektronenemission, falls sie als Glühkathode in einer elektrischen Entladungsröhre benutzt werden.
Das Verfahren zur Herstellung eines Glühkörpers gemäss der Erfindung besteht darin, dass ein nicht rekristallisierter Körper aus einem Metall von hohem Schmelzpunkt, zweckmässig aus Wolfram, das eine Metallverbindung wie Thoriumoxyd enthält, auf eine Temperatur erhitzt wird, die unter der Rekristallisationstemperatur liegt.
Wird dieses Verfahren z. B. an einem Thoriumoxyd enthaltenden Wolframdraht mit einem Durchmesser von 110 Mikron angewendet, so kann der Draht durch einen elektrischen Strom von 1'25 Amp. während 40 Stunden erhitzt werden. Es tritt dabei noch keine Rekristallisation auf, während das Thoriumoxyd nach der Oberfläche des Drahtes diffundiert.
Es hat sich herausgestellt, dass ein in solcher Weise hergestellter Gliihkörper mehr Licht ausstrahlt als ein thoriierter Wolframdraht, der auf übliche Weise unmittelbar auf oder höher als die Rekristallisationstemperatur erhitzt wird. Wird der Körper als elektronenemittierende Kathode in einer elektrischen Entladungsröhre benutzt, so zeigt sich, dass nach Aktivierung auch die Elektronenemission gesteigert ist.
Die Erscheinung lässt sich vielleicht dadurch erklären, dass in einem nicht rekristallisierten Draht das Thoriumoxyd leichter und rascher nach der Oberfläche diffundiert als in einem Körper, in dem der Kristallanwachs schon zu weit vorgeschritten ist.
**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.
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Method of manufacturing an incandescent body.
The invention relates to a method for producing an incandescent body.
Incandescent bodies made of a refractory metal, e.g. B. made of tungsten, which contains a metal compound such as thorium oxide, have long been known. Such an incandescent body can be used as a filament in an incandescent lamp and, after activation, also as an electron emitter in an electrical discharge tube.
The invention aims to produce such incandescent bodies with high light emission, if they are used as a filament in an incandescent lamp, or with high electron emission, if they are used as a hot cathode in an electric discharge tube.
The method for producing an incandescent body according to the invention consists in that a non-recrystallized body made of a metal with a high melting point, suitably made of tungsten, which contains a metal compound such as thorium oxide, is heated to a temperature below the recrystallization temperature.
If this method z. B. applied to a thorium oxide containing tungsten wire with a diameter of 110 microns, the wire can be heated by an electric current of 1'25 Amp. For 40 hours. There is still no recrystallization while the thorium oxide diffuses towards the surface of the wire.
It has been found that an incandescent body produced in this way emits more light than a thoriated tungsten wire, which is heated in the usual way directly to or higher than the recrystallization temperature. If the body is used as an electron-emitting cathode in an electrical discharge tube, it can be seen that the electron emission is also increased after activation.
The phenomenon can perhaps be explained by the fact that in a non-recrystallized wire the thorium oxide diffuses more easily and more quickly to the surface than in a body in which the crystal growth has already advanced too far.
** WARNING ** End of DESC field may overlap beginning of CLMS **.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL116825X | 1928-04-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
AT116825B true AT116825B (en) | 1930-03-10 |
Family
ID=19775286
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT116825D AT116825B (en) | 1928-04-13 | 1929-03-12 | Method of manufacturing an incandescent body. |
Country Status (1)
Country | Link |
---|---|
AT (1) | AT116825B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004040711A1 (en) * | 2004-08-23 | 2006-03-02 | Schneider, Frank | Illumination element consists of a metal conductor which can be connected to a current source and which lights up on switching on the current and is completely covered by a ceramic coating providing thermal luminescence |
-
1929
- 1929-03-12 AT AT116825D patent/AT116825B/en active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004040711A1 (en) * | 2004-08-23 | 2006-03-02 | Schneider, Frank | Illumination element consists of a metal conductor which can be connected to a current source and which lights up on switching on the current and is completely covered by a ceramic coating providing thermal luminescence |
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