DE823472C - Discharge tubes with graphite anode - Google Patents
Discharge tubes with graphite anodeInfo
- Publication number
- DE823472C DE823472C DES3007A DES0003007A DE823472C DE 823472 C DE823472 C DE 823472C DE S3007 A DES3007 A DE S3007A DE S0003007 A DES0003007 A DE S0003007A DE 823472 C DE823472 C DE 823472C
- Authority
- DE
- Germany
- Prior art keywords
- graphite
- anodes
- discharge tube
- polishing
- anodic
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2893/00—Discharge tubes and lamps
- H01J2893/0048—Tubes with a main cathode
- H01J2893/0051—Anode assemblies; screens for influencing the discharge
Landscapes
- Carbon And Carbon Compounds (AREA)
Description
Entladungsröhre mit Graphitanode Die Erfindung betriftt eine Entladungsröhre, insbesondere eine finit Gas, Dampf oder einem Gemisch gefüllte Stro inrichterröhre. Es ist an sich bekannt, solche Entladungsgefäße mit polierten Graphitanoden zu versehen. Es ist weiterhin auch vorgeschlagen worden, die Graphitanoden anodisch zu polieren. Nach einem solchen Vorschlag sollen die Graphitanoden durch Behandlung als Anoden in einem lad aus einem oder mehreren geschmolzenen Fluoriden anodisch poliert werden.Discharge tube with graphite anode The invention relates to a discharge tube, in particular a power converter tube filled with finite gas, steam or a mixture. It is known per se to provide such discharge vessels with polished graphite anodes. It has also been proposed to anodically polish the graphite anodes. According to such a proposal, the graphite anodes should be treated as anodes be anodically polished in a lad made of one or more molten fluorides.
Auf solche Art leergestellte Graphitanoden besitzen aber Nachteile. 1?s läßt sich nämlich beim aiiodischen Polieren nicht immer vermeiden, daß Rückstände in den Poren der Graphitkörper zurückbleiben. l)'ei Verwendung von geschmolzenen Fluoriden bereitet es Schwierigkeiten, diese Rückstände aus den Poren der Graphitanode restlos auszuwaschen. :lach durch Entgasen lassen sich dieselben nicht völlig entfernen. Dadurch besteht die Gefahr, daß durch Fluoride oder durch chemische Umsetzung oder durch im Betrieb einer Anode frei werdendes Fluor nachteilige Wirkungen in der Röhre entstehen.Graphite anodes empty in this way, however, have disadvantages. It is not always possible to avoid residues during aiiodic polishing remain in the pores of the graphite body. l) 'when using molten It is difficult for fluorides to remove these residues from the pores of the graphite anode to be washed off completely. : laugh they cannot be completely removed by degassing. This means that there is a risk of fluoride or chemical reaction or detrimental effects in the tube due to fluorine released during operation of an anode develop.
Diese Nachteile werden durch die Erfindung beseitigt. Die Erfindung besteht darin, daß Graphitanoden durch Behandlung als Anode in einem Bad aus destilliertem Wasser unter Zusatz von z. B. Essigsäure, Ammoniak oder Ammonsalzen anderer organischen Säuren anodisch poliert sind. Die genannten Zusätze können allein oder auch zu mehreren zusammen angewendet werden und bewirken die gewünschte elektrische Leitfähigkeit des destillierten Wasserbades. Beim anodischen Polieren lassen sich lose Graphitparti'kel .durch die dabei entstehende Gasentwicklung mechanisch ablösen. Kleine Graphitteile und Spitzen an der Oberfläche oxydieren unter Einwirkung von naszierendem Sauerstoff. Bei den genannten Stoffen kommt es darauf an, daß Rückstände, sofern solche im Graphit zurückbleiben, sich durch Eilhitzen in gasförmige Verbindungen zerlegen lassen, so daß sie dadurch leicht entfernt werden können. Man erhält auf diese Weise Graphitanoden hoher Reinheit, wenn man nach erfolgtem anodischen Polieren eine Erhitzung der Graphitanoden vornimmt, so daß die Rückstände in gasförmigem Zustand entfernt werden können. Auf diese Weise sind solch Anoden auch für Hochvakuumröhren geeignet.These disadvantages are eliminated by the invention. The invention is that graphite anodes by treatment as an anode in a bath of distilled Water with the addition of z. B. acetic acid, ammonia or ammonium salts of other organic Acids are anodically polished. The additives mentioned can be used alone or in groups can be used together and produce the desired electrical conductivity of the distilled water bath. Loose graphite particles can be released during anodic polishing . Remove mechanically due to the resulting gas development. Small graphite parts and peaks on the surface oxidize under the action of nascent Oxygen. In the case of the substances mentioned, it is important that residues, if those that remain in the graphite are converted into gaseous compounds by rapid heating let them disassemble so that they can be easily removed. One receives on This way, graphite anodes of high purity, if one has done anodic polishing a heating of the graphite anodes takes place, so that the residues in gaseous State can be removed. In this way, such anodes are also suitable for high vacuum tubes suitable.
Claims (4)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES3007A DE823472C (en) | 1950-04-30 | 1950-04-30 | Discharge tubes with graphite anode |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES3007A DE823472C (en) | 1950-04-30 | 1950-04-30 | Discharge tubes with graphite anode |
Publications (1)
Publication Number | Publication Date |
---|---|
DE823472C true DE823472C (en) | 1951-12-03 |
Family
ID=7469904
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DES3007A Expired DE823472C (en) | 1950-04-30 | 1950-04-30 | Discharge tubes with graphite anode |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE823472C (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1033334B (en) * | 1954-11-10 | 1958-07-03 | Siemens Ag | Process for the manufacture of rectifiers, transistors and the like Like. With metal contacts according to the alloy or diffusion process |
DE102006062375B4 (en) * | 2006-12-19 | 2017-05-04 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Arrangement and method for removing impurities or modifying surfaces of substrates by means of electrical arc discharge |
-
1950
- 1950-04-30 DE DES3007A patent/DE823472C/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1033334B (en) * | 1954-11-10 | 1958-07-03 | Siemens Ag | Process for the manufacture of rectifiers, transistors and the like Like. With metal contacts according to the alloy or diffusion process |
DE102006062375B4 (en) * | 2006-12-19 | 2017-05-04 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Arrangement and method for removing impurities or modifying surfaces of substrates by means of electrical arc discharge |
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