AT116825B - Method of manufacturing an incandescent body. - Google Patents

Method of manufacturing an incandescent body.

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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
Application number
Other languages
German (de)
Inventor
Cornelis Zwikker
Original Assignee
Philips Nv
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 Philips Nv filed Critical Philips Nv
Application granted granted Critical
Publication of AT116825B publication Critical patent/AT116825B/en

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  • Discharge Lamp (AREA)

Description

  

   <Desc/Clms Page number 1> 
 



  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**.



   <Desc / Clms Page number 1>
 



  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)

PATENT-ANSPRUCH : EMI1.1 sierter Körper aus einem hochschmelzenden Metall, zweckmässig Wolfram, das eine Metallverbindung, wie Thoriumoxyd, enthält, auf eine Temperatur erhitzt wird. die niedriger als die Rekristallisationstemperatur ist. **WARNUNG** Ende CLMS Feld Kannt Anfang DESC uberlappen**. PATENT CLAIM: EMI1.1 Sated body made of a refractory metal, conveniently tungsten, which contains a metal compound such as thorium oxide, is heated to a temperature. which is lower than the recrystallization temperature. ** WARNING ** End of CLMS field may overlap beginning of DESC **.
AT116825D 1928-04-13 1929-03-12 Method of manufacturing an incandescent body. AT116825B (en)

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

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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.

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AT (1) AT116825B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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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