DE492160C - Incandescent cathode for vacuum tubes, consisting of a hard-to-melt metal, e.g. B tungsten etc., with the addition of thoroxide, which is brought into a state of high specific emission by reducing agents such as carbon - Google Patents
Incandescent cathode for vacuum tubes, consisting of a hard-to-melt metal, e.g. B tungsten etc., with the addition of thoroxide, which is brought into a state of high specific emission by reducing agents such as carbonInfo
- Publication number
- DE492160C DE492160C DEG57111D DEG0057111D DE492160C DE 492160 C DE492160 C DE 492160C DE G57111 D DEG57111 D DE G57111D DE G0057111 D DEG0057111 D DE G0057111D DE 492160 C DE492160 C DE 492160C
- Authority
- DE
- Germany
- Prior art keywords
- carbon
- thoroxide
- hard
- addition
- high specific
- 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
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims description 8
- 229910052799 carbon Inorganic materials 0.000 title claims description 8
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 title claims description 5
- 229910052721 tungsten Inorganic materials 0.000 title claims description 5
- 239000010937 tungsten Substances 0.000 title claims description 5
- 239000003638 chemical reducing agent Substances 0.000 title claims 3
- 229910052751 metal Inorganic materials 0.000 title claims 2
- 239000002184 metal Substances 0.000 title claims 2
- ZCUFMDLYAMJYST-UHFFFAOYSA-N thorium dioxide Chemical compound O=[Th]=O ZCUFMDLYAMJYST-UHFFFAOYSA-N 0.000 claims description 3
- 239000000654 additive Substances 0.000 claims 1
- 230000000996 additive effect Effects 0.000 claims 1
- 239000003245 coal Substances 0.000 claims 1
- 230000037431 insertion Effects 0.000 claims 1
- 238000003780 insertion Methods 0.000 claims 1
- 238000000034 method Methods 0.000 description 4
- ZSLUVFAKFWKJRC-IGMARMGPSA-N 232Th Chemical compound [232Th] ZSLUVFAKFWKJRC-IGMARMGPSA-N 0.000 description 3
- 229910052776 Thorium Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000010406 cathode material Substances 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010405 reoxidation reaction Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 210000000115 thoracic cavity Anatomy 0.000 description 1
- 150000003586 thorium compounds Chemical class 0.000 description 1
- 229910003452 thorium oxide Inorganic materials 0.000 description 1
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
- H01J9/042—Manufacture, activation of the emissive part
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Discharge Lamp (AREA)
Description
Gegenstand der vorliegenden Erfindung ist eine Glühkathode für Vakuumröhren, die nach einem besonderen Verfahren hergestellt ist. Die Vorteile von Entladungsgefäßen, bei denen eine Elektrode Thorium oder eine Thoriumverbindung enthält, sind bekannt. Solche Elektroden bestehen aus einem feuerfesten leitenden Material, z. B. Wolfram, mit einem Zusatz von Thorerde. Es muß dabei die Glühkathode so bearbeitet werden, daß das aktive Material zum Schluß aus metallischem Thorium besteht oder zum mindesten aus einem niedrigeren Thoriumoxyd als Thorerde (ThO2). Es ist bereits bekannt, Thorrumkathoden mitüels Kohlenstoffs zu reduzieren. Die vorliegende Erfindung gründet sich darauf, den Kohlenstoff, abweichend von den bisher üblichen Verfahren, dem Kathodenmaterial bereits vor seiner Einführung in die Entladungsröhre, also zweckmäßig schon bei seiner Herstellung, zuzufügen. Kohle in einer thorisierten Kathode verhindert nicht nur die Wiederoxydation des aktiven Thoriums, sondern, was noch wesentlicher ist, sie reduziert Thorerde in einem aktiven Zustand. 2g Es hat sich ergeben, daß eine Kathode mit guter Elektronenemission dann erzielt wird, wenn etwa 3/4 ο/ο Thorerde und 2/3 Gewichtsprozent Kohle dem Fadenmaterial, z. B. Wolfram, zugeführt wird. Die Herstellung des thorisierten Fadens kann durch Bespritzen von Wolfram und Thorerde mit einem kohlehaltigen Bindemittel erfolgen.The present invention relates to a hot cathode for vacuum tubes, which is produced by a special process. The advantages of discharge vessels in which an electrode contains thorium or a thorium compound are known. Such electrodes are made of a refractory conductive material, e.g. B. tungsten, with an addition of thorer earth. The hot cathode must be processed in such a way that the active material ultimately consists of metallic thorium or at least a lower thorium oxide than thore earth (ThO 2 ). It is already known to reduce thoracic cathodes with carbon. The present invention is based on adding the carbon to the cathode material prior to its introduction into the discharge tube, that is to say expediently already during its manufacture, in a departure from the previously customary methods. Charcoal in a thorized cathode not only prevents reoxidation of the active thorium, but, more importantly, it reduces sulfur earth in an active state. 2 g It has been found that a cathode with good electron emission is obtained when about 3/4 ο / ο thoria and 2/3 weight percent carbon the thread material z,. B. tungsten is supplied. The thorised thread can be produced by spraying tungsten and thorn earth with a carbon-containing binding agent.
Die vorliegende Erfindung stellt eine Vereinfachung der Fabrikation dar. Xach den bisher üblichen Verfahren wurde der Kohlenstoff dem Kathodenmaterial erst in den Entladungsröhren selbst zugeführt. Diese Methode hatte technisch verschiedene Schwierigkeiten und war außerdem kostspieliger als die Herstellung gemäß der Erfindung.The present invention represents a simplification of the fabrication. Xach the Up to now, the usual method, the carbon was added to the cathode material only in the discharge tubes self fed. This method had various technical difficulties and was also more expensive than that Manufacture according to the invention.
Claims (2)
Kohle enthält.2. thermionic cathode according to claim i, characterized in that it about 3/4 ° / 0 thoria
Contains coal.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US491634A US1529597A (en) | 1921-08-11 | 1921-08-11 | Electron-emitting device and method of preparation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE492160C true DE492160C (en) | 1930-02-19 |
Family
ID=23953025
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEG57111D Expired DE492160C (en) | 1921-08-11 | 1922-07-23 | Incandescent cathode for vacuum tubes, consisting of a hard-to-melt metal, e.g. B tungsten etc., with the addition of thoroxide, which is brought into a state of high specific emission by reducing agents such as carbon |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US1529597A (en) |
| DE (1) | DE492160C (en) |
| FR (1) | FR26734E (en) |
| GB (1) | GB184446A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2465864A (en) * | 1943-06-22 | 1949-03-29 | Westinghouse Electric Corp | Automatic carbonization of filaments |
| US2459792A (en) * | 1944-07-08 | 1949-01-25 | Standard Telephones Cables Ltd | Beam type electron discharge device |
| US2513114A (en) * | 1944-10-19 | 1950-06-27 | Atomic Energy Commission | Liquid air trap |
| US2693546A (en) * | 1948-07-10 | 1954-11-02 | Eitel Mccullough Inc | Electron emitter for electron tubes |
| US3290110A (en) * | 1962-12-26 | 1966-12-06 | Rca Corp | Processing metal vapor tubes |
| US3656826A (en) * | 1970-07-17 | 1972-04-18 | Westinghouse Electric Corp | Method for the preparation and handling of highly oxygen reactant materials |
-
1921
- 1921-08-11 US US491634A patent/US1529597A/en not_active Expired - Lifetime
-
1922
- 1922-07-15 GB GB19496/22A patent/GB184446A/en not_active Expired
- 1922-07-23 DE DEG57111D patent/DE492160C/en not_active Expired
- 1922-08-09 FR FR26734D patent/FR26734E/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB184446A (en) | 1924-01-15 |
| US1529597A (en) | 1925-03-10 |
| FR26734E (en) | 1924-03-06 |
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