DE618917C - Indirectly heated glow cathode - Google Patents
Indirectly heated glow cathodeInfo
- Publication number
- DE618917C DE618917C DEM109272D DEM0109272D DE618917C DE 618917 C DE618917 C DE 618917C DE M109272 D DEM109272 D DE M109272D DE M0109272 D DEM0109272 D DE M0109272D DE 618917 C DE618917 C DE 618917C
- Authority
- DE
- Germany
- Prior art keywords
- aluminum
- indirectly heated
- glow cathode
- heated glow
- oxygen
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
- H01J1/02—Main electrodes
- H01J1/13—Solid thermionic cathodes
- H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
- H01J1/24—Insulating layer or body located between heater and emissive material
Landscapes
- Discharge Lamp (AREA)
Description
Indirekt beheizte Glühkathode Die Erfindung bezieht sich auf sogenannte indirekt beheizte Glühkathoden für elektrische Entladungsgefäße, bei denen der Heizdraht zur Erwärmung einer Isoliermasse dient, die ihrerseits erst die emittierende Substanz auf die erforderliche Temperatur bringt.Indirectly heated hot cathode The invention relates to so-called indirectly heated hot cathodes for electrical discharge vessels, in which the heating wire is used to heat an insulating compound, which in turn only the emitting substance brings to the required temperature.
Als Baustoffe für die Isoliermasse sind Porzellane und Oxyde von stark säuerstoffaffinen Metallen, wie Magnesium und Aluminium, bekannt. Durch geeignete Wahl .des Heizdraht- und Isoliermaterials kann man erreichen, daß der Isolierstoff nicht oxydierend auf den Heizdraht einwirkt. Wenn jedoch der Sauerstoff auf irgendeine andere Weise Einfluß auf den Heizdraht gewinnt, z. B. in Form einer oberflächlichen Oxydation, so ist trotz der richtigen Wahl der Isoliermasse seine Haltbarkeit gefährdet.Porcelains and oxides are strong as building materials for the insulating compound Metals with an affinity for oxygen, such as magnesium and aluminum, are known. Through suitable Choice .des heating wire and insulating material can be achieved that the insulating material does not have an oxidizing effect on the heating wire. However, if the oxygen falls to any other way gains influence on the heating wire, z. B. in the form of a superficial Oxidation, despite the correct choice of insulating compound, its durability is at risk.
Die Erfindung bezweckt nun, solche Einflüsse des Sauerstoffes unschädlich zu machen. Erreicht wird dies dadurch, daß .der Isolierkörper mit einem stark reduzierend wirkenden Stoff, z. B. Aluminium, versetzt wird.The invention now aims to render such influences of oxygen harmless close. This is achieved in that .the insulating body with a strongly reducing acting substance, e.g. B. aluminum, is added.
An sich ist es bekannt, Aluminium zur Bindung von Sauerstoff zu benutzen und Aluminiumüberzüge auf Metallteilen anzubringen, die auftreffende Gasteilchen absorbieren.It is known per se to use aluminum to bind oxygen and to apply aluminum coatings to metal parts, the impinging gas particles absorb.
Gemäß der Erfindung soll nun der einen Teil der indirekt beheizten Kathode bildende Isolator mit Aluminium' versetzt sein. Der Isolator liegt während des Betriebes dauernd auf hoher Temperatur, so,daß das Aluminium während des Betriebes von dem Isolator herunter verdampft wird. Da der Heizdraht - im allgemeinen ein Wolframdraht - sich in allernächster Nähe des Isolierkörpers befindet, reduziert das verdampfende Aluminium etwa auf dem Wolframdraht entstandene Oxydstellen, wodurch die Zerstörung des Drahtes hintangehalten wird.According to the invention, the one part of the indirectly heated Cathode-forming insulator with aluminum 'be added. The isolator lies during of operation continuously at a high temperature, so that the aluminum during operation is evaporated down from the isolator. Because the heating wire - in general one Tungsten wire - located very close to the insulator, reduced the evaporating aluminum, for example, on the tungsten wire created oxide spots, whereby the destruction of the wire is prevented.
An sich ist es zwar bekannt, Aluminium als Getterstoff zu benutzen, jedoch kann durch einen solchen Getterstoff die Wirkung des unter Schutz gestellten Isolierkörpers nicht erreicht werden, weil die Gettersubstanz nicht in .den engen Zwischenraum zwischen Isolierstoff und Draht hineinkommt.It is known per se to use aluminum as a getter material, however, such a getter substance can reduce the effect of the under protection Insulator cannot be reached because the getter substance is not in .den Gap between insulating material and wire comes into it.
Den Isolierstoff kann man z. B. dadurch mit Aluminium versetzen, daß man ihm Aluminiummetall in Pulverform beimengt. Sofern die einzelnen Aluminiumstäubchen keinen Zusammenhang miteinander haben, wird die Leitfähigkeit des Isolierstoffes nicht erhöht. Das Aluminium wird jedoch überall, wo es, z. B. auch als Dampf, mit Sauerstoff oder Sauerstoffverbindungen in Berührung kommt, diesen sofort binden und ihn dadurch unschädlich machen.The insulating material can be used, for. B. thereby offset with aluminum that powdered aluminum metal is added to it. Provided the individual aluminum dust have no connection with each other, the conductivity of the insulating material not increased. However, the aluminum is used wherever there is, e.g. B. also as steam, with Comes into contact with oxygen or oxygen compounds, bind them immediately and thereby render it harmless.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEM109272D DE618917C (en) | 1929-03-15 | 1929-03-15 | Indirectly heated glow cathode |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEM109272D DE618917C (en) | 1929-03-15 | 1929-03-15 | Indirectly heated glow cathode |
Publications (1)
Publication Number | Publication Date |
---|---|
DE618917C true DE618917C (en) | 1935-09-18 |
Family
ID=7326665
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEM109272D Expired DE618917C (en) | 1929-03-15 | 1929-03-15 | Indirectly heated glow cathode |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE618917C (en) |
-
1929
- 1929-03-15 DE DEM109272D patent/DE618917C/en not_active Expired
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