CH124219A - Process for the production of metallic absorption layers in electrical rectifier vessels. - Google Patents
Process for the production of metallic absorption layers in electrical rectifier vessels.Info
- Publication number
- CH124219A CH124219A CH124219DA CH124219A CH 124219 A CH124219 A CH 124219A CH 124219D A CH124219D A CH 124219DA CH 124219 A CH124219 A CH 124219A
- Authority
- CH
- Switzerland
- Prior art keywords
- vessels
- production
- absorption layers
- metallic absorption
- electrical rectifier
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J17/00—Gas-filled discharge tubes with solid cathode
- H01J17/02—Details
- H01J17/22—Means for obtaining or maintaining the desired pressure within the tube
- H01J17/24—Means for absorbing or adsorbing gas, e.g. by gettering
-
- 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
- H01J9/38—Exhausting, degassing, filling, or cleaning vessels
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physical Vapour Deposition (AREA)
Description
Verfahren zur Herstellung von metallischen Absorptionsschichten in elektrischen Gleichrichtergefässen. Zum Schutze des Vakuums oder der Gas füllung in elektrischen Glühkathoden-Gleich- richtern wird allgemein eine dünne Metall schicht von Magnesium; Calcium oder Alu minium an den Gefässwänden erzeugt, welche den Zweck hat, schädliche Gase, welche den Gleichrichtervorgang stören, zu absorbieren.
Die Schicht wurde bislang erzeugt, indem man das zu verdampfende Metall auf der Anode befestigte und letztere durch Elek tronenbombardement zum Glüben brachte, wodurch das Metall verdampfte und die wirk same Absorptionsschicht erzeugt wurde. Dieses Verfahren hat den grossen Nachteil, dass die Glühkathode durch die aus der Anode aus strömenden Gase beschädigt werden kann, lange bevor die Anode durch Erglühen die wirksame Absorptionsschicht erzeugen kann..
Dieser Nachteil wird umgangen, wenn man das zu verdampfende Metall, z. B. Mag nesium, Calcium oder Aluminium, usw., bei spielsweise in Drahtform verwendet und ent- weder um die Glühkathode herumwickelt, oder falls dieselbe als Spirale ausgebildet ist, in diese hineinsteckt. Die Schutzschicht entsteht in dem Fall sofort, sobald durch Strom die Kathode zum Glühen gebracht wird. Hierdurch wird der Pumpprozess be deutend abgekürzt und eine Beschädigung der Kathode findet nicht statt.
Dieses Verfahren ist besonders wichtig, wenn als Kathode thorierter, das heisst mit Thorium legierter Wolfram- oder Molybdändraht verwendet wird.
Process for the production of metallic absorption layers in electrical rectifier vessels. To protect the vacuum or the gas filling in electric hot cathode rectifiers, a thin metal layer of magnesium is generally used; Calcium or aluminum is generated on the vessel walls, which has the purpose of absorbing harmful gases that interfere with the rectifier process.
The layer was previously created by attaching the metal to be evaporated to the anode and causing the latter to glow by electron bombardment, whereby the metal evaporated and the effective absorption layer was produced. This method has the major disadvantage that the hot cathode can be damaged by the gases flowing out of the anode long before the anode can generate the effective absorption layer by glowing.
This disadvantage is avoided if the metal to be evaporated, e.g. B. magnesium, calcium or aluminum, etc., used for example in wire form and either wrapped around the hot cathode, or if the same is designed as a spiral, inserted into it. In this case, the protective layer is created immediately as soon as the cathode is made to glow by electricity. This significantly shortens the pumping process and prevents damage to the cathode.
This method is particularly important if the cathode used is thoriated, i.e. tungsten or molybdenum wire alloyed with thorium.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH124219T | 1926-12-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH124219A true CH124219A (en) | 1928-01-16 |
Family
ID=4382861
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH124219D CH124219A (en) | 1926-12-31 | 1926-12-31 | Process for the production of metallic absorption layers in electrical rectifier vessels. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH124219A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE750230C (en) * | 1935-10-22 | 1944-12-20 | Rca Corp | Electric discharge tubes with an indirectly heated glow cathode |
-
1926
- 1926-12-31 CH CH124219D patent/CH124219A/en unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE750230C (en) * | 1935-10-22 | 1944-12-20 | Rca Corp | Electric discharge tubes with an indirectly heated glow cathode |
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