DE720753C - Indirectly heated cathode with an equipotential layer made of nickel - Google Patents
Indirectly heated cathode with an equipotential layer made of nickelInfo
- Publication number
- DE720753C DE720753C DET52801D DET0052801D DE720753C DE 720753 C DE720753 C DE 720753C DE T52801 D DET52801 D DE T52801D DE T0052801 D DET0052801 D DE T0052801D DE 720753 C DE720753 C DE 720753C
- Authority
- DE
- Germany
- Prior art keywords
- nickel
- additives
- emission
- equipotential layer
- indirectly heated
- 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
- H01J1/26—Supports for the emissive material
Landscapes
- Electrolytic Production Of Metals (AREA)
Description
Mittelbar geheizte Kathode mit Äquipotentialschicht aus Nickel Bei mittelbar geheizten Kathoden %@zrd als Äquipotentialschicht und damit als Unterlage für die Emissio-nsscbicht vorzugsweisse Nikkel benutzt. Durch besondere Zusätze zum Nickel wird die Emission der Emissionsschicht weitgehend erhöht. Solche Zusätze sind beispielsweise die Metalle Magnesium, Aluminium, Titan und Silicium. Die Metalle werden in ringen Menge zugegeben, und zwar etwa in einer Menge, wie dies bei reduzierenden Zusätzen für Metallschmelzen üblich ist. Es wurde nun festgestellt, daß mittelbar geheizte Kathoden, die mit solcher Äquipotentialschicht ausgerüstet waren, eine schlechte Isolation 'wischen Kathode und Heizfaden haben.Indirectly heated cathode with equipotential layer made of nickel indirectly heated cathodes% @ zrd as an equipotential layer and thus as a base Preferably white nickel is used for the emission report. With special additives in relation to nickel, the emission of the emission layer is largely increased. Such additives are for example the metals magnesium, aluminum, titanium and silicon. The metals are added in small amounts, approximately in the same amount as is the case with reducing Additives for molten metal is common. It has now been found that indirectly heated cathodes equipped with such an equipotential layer, a have poor insulation 'wipe cathode and filament.
Dieser Fehler verschwindet jedoch, wenn bei einer mittelbar geheizten Kathode mit Äquiputentialschicht aus Nickel gemäß der Erfindung diese Nickelschicht aus einem äußeren Teil mit emissionsfördernden Zusätzen, und einem inneren, dem Heizkörper zugewandten Schicht, die von solchen Zusätzen frei ist, besteht. In diesem Fall wurde beispielsweise statt einer Isolation von 3 bis 5 Megohm eine solche von 3oo bis Sooo Megahm erhalten.This error disappears, however, if with an indirectly heated Cathode with equiputential layer made of nickel according to the invention, this nickel layer from an outer part with emission-promoting additives, and an inner part, the Layer facing the radiator, which is free of such additives, consists. In this For example, instead of an insulation of 3 to 5 megohms, an insulation of 3oo to Sooo Megahm received.
Offenbar ist diese günstige Wirkung der inneren Schicht aus reinem Metall so zu erklären, daß die üblichen Zusätze, Magnesium, Aluminium, Titan und Silizium, bei der Arbeitstemperatur der Kathode eine bereits merkbare Emission besitzen, so daß ein Elektronenstrom von der Kathode zurr Heizkörper hinüber fließen kann. Fehlen die Zusätze, so tritt ein solcher Emissionsstrom nicht auf.Evidently this beneficial effect is the inner layer of pure To explain metal in such a way that the usual additives, magnesium, aluminum, and titanium Silicon, already have a noticeable emission at the working temperature of the cathode, so that a stream of electrons can flow from the cathode to the heater. If the additives are missing, such an emission current does not occur.
Hülsenförmige Äquipotentialschichten gemäß der Erfindung können beispielsweise dadurch herZestellt -werden, daß ein Röhrchen aus Elel>trolytniclz#el und ein mit den Zusätzen versehenes Röhrchen ineinandergesteckt und zusammen auf den gewünschten Durchmesser gezogen werden. Man kann auch reines Nickel elektrolytisch auf die Innenseite eines mit den emissionsfördernden Zusätzen versehenen Röhrchens aufbringen und so das zweischichtige Hülsenmaterial herstellen. auch eine so gewonnene Hülse kann im Bedarfsfall noch weiter auf einen kleineren Durchmesser heruntergezogen werden. Ferner kann eine renne Nickelhülse außen mit einem Nickelband umt@ickelt werden, das mit den emissionsfördernden Zusätzen legiert ist.Sleeve-shaped equipotential layers according to the invention can, for example produced by using a tube made of Elel> trolytniclz # el and one with The tubes provided with the additives are inserted into each other and together on the desired Diameter to be drawn. Pure nickel can also be electrolytically applied to the inside apply a tube provided with the emission-promoting additives and so on make the two-layer sleeve material. even a sleeve obtained in this way can if necessary, can be pulled down even further to a smaller diameter. Furthermore, a nickel sleeve can be wrapped with a nickel tape on the outside, which is alloyed with the emission-promoting additives.
In der Abbildung ist ein Ausführungsbeispiel für den Gegenstand der Erfindung schematisch und stark vergrößert dargestellt. Die mit den emissionsfördernden Zusätzen versehene äußere Hülse i umschließt die aus reinem Nickel bestehende innere Hülse 2. In den Hohlraum der Hülse 2 wird der Kathodenheizkörper eingeschoben, während die Hülse i die Emissionsschicht trägt.In the figure is an embodiment of the subject matter of Invention shown schematically and greatly enlarged. The ones with the emissions-promoting Outer sleeve provided with additives encloses the inner one made of pure nickel Sleeve 2. The cathode heater is pushed into the cavity of the sleeve 2 while the sleeve i carries the emission layer.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DET52801D DE720753C (en) | 1939-09-12 | 1939-09-13 | Indirectly heated cathode with an equipotential layer made of nickel |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE871068X | 1939-09-12 | ||
| DET52801D DE720753C (en) | 1939-09-12 | 1939-09-13 | Indirectly heated cathode with an equipotential layer made of nickel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE720753C true DE720753C (en) | 1942-05-14 |
Family
ID=25951958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DET52801D Expired DE720753C (en) | 1939-09-12 | 1939-09-13 | Indirectly heated cathode with an equipotential layer made of nickel |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE720753C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE942460C (en) * | 1952-10-24 | 1956-05-03 | Telefunken Gmbh | Process for the production of oxide cathodes for electrical discharge tubes |
| DE1027801B (en) * | 1955-08-25 | 1958-04-10 | Lorenz C Ag | Carrier for oxide cathodes |
| DE1090775B (en) * | 1957-01-24 | 1960-10-13 | Telefunken Gmbh | Indirectly heated cathode for electrical discharge tubes |
-
1939
- 1939-09-13 DE DET52801D patent/DE720753C/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE942460C (en) * | 1952-10-24 | 1956-05-03 | Telefunken Gmbh | Process for the production of oxide cathodes for electrical discharge tubes |
| DE1027801B (en) * | 1955-08-25 | 1958-04-10 | Lorenz C Ag | Carrier for oxide cathodes |
| DE1090775B (en) * | 1957-01-24 | 1960-10-13 | Telefunken Gmbh | Indirectly heated cathode for electrical discharge tubes |
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