DE632638C - Process for the production of indirectly heated high-emission cathodes for discharge vessels - Google Patents
Process for the production of indirectly heated high-emission cathodes for discharge vesselsInfo
- Publication number
- DE632638C DE632638C DEL71363D DEL0071363D DE632638C DE 632638 C DE632638 C DE 632638C DE L71363 D DEL71363 D DE L71363D DE L0071363 D DEL0071363 D DE L0071363D DE 632638 C DE632638 C DE 632638C
- Authority
- DE
- Germany
- Prior art keywords
- layer
- heated high
- production
- discharge vessels
- coating
- 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
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/02—Manufacture of electrodes or electrode systems
- H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/10—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances metallic oxides
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Solid Thermionic Cathode (AREA)
Description
Verfahren zur Herstellung von indirekt geheizten Hochexnissionskathoden für Entladungsgefäße Bei der Herstellung netzgeheizter Kathoden mit indirekter Heizung der Emissionsquelle besteht die Aufgabe, den primär erhitzten Körper von der eigentlichen Emissionskathode ganz oder teilweise zu isolieren. Diese Aufgabe ist bisher durch überschieben eines Isolierkörpers über den Heizkörper und durch Befestigung eines metallischen überzuges auf diesem Isolierkörper gelöst worden. Bei diesen Anordnungen bestehen große fabrikatorische Schwierigkeiten.Process for the production of indirectly heated high emission cathodes for discharge vessels In the manufacture of line-heated cathodes with indirect heating The source of the emission is the primary heated body from the actual To isolate the emission cathode in whole or in part. This task is through so far pushing an insulating body over the radiator and attaching one metallic coating on this insulating body has been solved. With these arrangements there are great manufacturing difficulties.
Es ist auch bekannt, die Überzüge dadurch herzustellen, daß man eine wäßrige Suspension von Kaolin auf den Draht aufbringt und festsintert. Die so hergestellten Isolierschichten sind spröde und neigen unter Umständen zum Absplittern. Zur Beseitigung dieses übelstandes wird erfindungsgemäß der Isolierkörper durch chemisch-thermischen Zerfall aus Chromylchlorid oder Ammoniumbichromat als Ausgangsverbindung hergestellt.It is also known to produce the coatings by having a Applying aqueous suspension of kaolin to the wire and sintering it. The so produced Insulating layers are brittle and may have a tendency to splinter. For elimination According to the invention, this disadvantage is the insulating body by means of chemical-thermal Decomposition produced from chromyl chloride or ammonium dichromate as the starting compound.
Es ist bekannt, daß Chromylchlorid beim Erhitzen auf höhere Temperatur in Chromoxyd Cr. 03 und Chlor zerfällt. Läßt man also einen Draht aus Wolfram, Platin o. dgl. in einer Atmosphäre von Chromylchlorid auf etwa Rotglut kommen, so setzt sich an demselben eine sehr fest haftende Schicht von Chromoxyd ab, das ein ausgezeichneter Isolator ist.It is known that chromyl chloride when heated to a higher temperature in chromium oxide Cr. 03 and chlorine breaks down. So if you leave a wire made of tungsten, platinum or the like. Come to red heat in an atmosphere of chromyl chloride, so sets a very firmly adhering layer of chromium oxide is deposited on it, which is an excellent one Isolator is.
Die gleiche Schicht von Chromoxyd erhält man, wenn man den Faden mit einer Schicht von Ammoniumbichromat bedeckt und diese Substanz hierauf durch Erhitzen zersetzt.The same layer of chromium oxide is obtained by using the thread covered with a layer of ammonium dichromate and this substance on top by heating decomposed.
Man hat es weiter in -der Hand, durch Sinterung diesen Überzug nachträglich noch in geeignete Form zu bringen. Ebenso ist es leicht, einzelne Stellen des Drahtes, beispielsweise die später als Ableitung verwendeten Enden, durch Überstecken von Blenden oder Röhrchen frei von Chromoxyd zu halten.You still have it in your hand, by sintering this coating afterwards still to be brought into a suitable form. It is also easy to remove individual parts of the wire, for example the ends used later as a derivation, by plugging over Keep diaphragms or tubes free of chromium oxide.
Der auf die erfindungsgemäße Weise hergestellte isolierende riberzug wird nun seinerseits mit einer metallischen Belegung versehen. Letztere kann entweder in üblicher Weise aus einem entsprechend geformten Blech oder Röhrchen bestehen oder durch Ausfällen bzw. Aufstäuben von Metall auf die Isolierschicht erzeugt werden.The insulating coating produced in the manner according to the invention is now in turn provided with a metallic coating. The latter can either consist in the usual way of a correspondingly shaped sheet metal or tube or by precipitation or sputtering of metal onto the insulating layer.
Da die gesamte abgestrahlte Energie von der Größe der gesamten Oberfläche abhängt, ist es vorteilhaft, bei gegebener Länge der Kathode den Umfang der strahlenden Oberfläche möglichst klein zu halten, d. h. es ist erforderlich, die äußere leitende Belegung der Kathode möglichst eng an die Isolierschicht anzuschließen. Es ist daher vorteilhaft, die äußere leitende Belegung der Kathode direkt auf die Isolierschicht aufzubrennen. Man erzeugt diesen Überzug beispielsweise durch Aufbringen einer Lösung von Platin (beispielsweise Westhaversche Platinlösung), Gold, Silber o. dgl. in organischen Lösungsmitteln und Trocknen und Er- hitien des so präparierten Isolierkörpers auf Rotglut. Man kann ihn auch durch Erhitzen des Isolierkörpers in einer Flüssigkeit "voxä, Nickelcarbonyl herstellen.Since the total radiated energy depends on the size of the entire surface, it is advantageous to keep the circumference of the radiating surface as small as possible for a given length of the cathode, ie it is necessary to connect the outer conductive coating of the cathode as closely as possible to the insulating layer. It is therefore advantageous to burn the external conductive coating of the cathode directly onto the insulating layer. This coating is produced, for example, by applying a solution of platinum (for example Westhaver's platinum solution), gold, silver or the like in organic solvents and drying and hitien the insulator prepared in this way to red heat. It can also be produced by heating the insulating body in a liquid "voxa", nickel carbonyl.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEL71363D DE632638C (en) | 1928-03-20 | 1928-03-20 | Process for the production of indirectly heated high-emission cathodes for discharge vessels |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEL71363D DE632638C (en) | 1928-03-20 | 1928-03-20 | Process for the production of indirectly heated high-emission cathodes for discharge vessels |
Publications (1)
Publication Number | Publication Date |
---|---|
DE632638C true DE632638C (en) | 1936-07-10 |
Family
ID=7282764
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEL71363D Expired DE632638C (en) | 1928-03-20 | 1928-03-20 | Process for the production of indirectly heated high-emission cathodes for discharge vessels |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE632638C (en) |
-
1928
- 1928-03-20 DE DEL71363D patent/DE632638C/en not_active Expired
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