DE466462C - Process for the production of glow cathodes - Google Patents
Process for the production of glow cathodesInfo
- Publication number
- DE466462C DE466462C DES68115D DES0068115D DE466462C DE 466462 C DE466462 C DE 466462C DE S68115 D DES68115 D DE S68115D DE S0068115 D DES0068115 D DE S0068115D DE 466462 C DE466462 C DE 466462C
- Authority
- DE
- Germany
- Prior art keywords
- production
- hafnium
- glow cathodes
- filament
- cathodes
- 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
- 238000000034 method Methods 0.000 title claims description 5
- 238000004519 manufacturing process Methods 0.000 title claims description 3
- 229910052735 hafnium Inorganic materials 0.000 claims description 7
- VBJZVLUMGGDVMO-UHFFFAOYSA-N hafnium atom Chemical compound [Hf] VBJZVLUMGGDVMO-UHFFFAOYSA-N 0.000 claims description 7
- 229910052783 alkali metal Inorganic materials 0.000 claims description 4
- 150000001340 alkali metals Chemical class 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 150000002363 hafnium compounds Chemical class 0.000 claims description 2
- 239000003870 refractory metal Substances 0.000 claims description 2
- 229910000449 hafnium oxide Inorganic materials 0.000 claims 1
- WIHZLLGSGQNAGK-UHFFFAOYSA-N hafnium(4+);oxygen(2-) Chemical compound [O-2].[O-2].[Hf+4] WIHZLLGSGQNAGK-UHFFFAOYSA-N 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 150000002739 metals Chemical class 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Solid Thermionic Cathode (AREA)
Description
Verfahren zur Herstellung von Glühkathoden Es ist bereits vorgeschlagen worden, Glühkathoden aus Hafnium oder Hafniumlegierungen herzustellen. Auch ist vorgeschlagen «-orden, Überzüge aus Metallen mit spezifisch hoher Elektronenemission durch Reduktion einer Verbindung des betreffenden Metalls herzustellen.Process for the production of hot cathodes It has already been proposed have been to produce hot cathodes from hafnium or hafnium alloys. Also is proposed «-order, coatings made of metals with specifically high electron emission by reducing a compound of the metal in question.
Gemäß der Erfindung erhält man besonders wirksame Glühkathoden aus Hafnium, wenn man auf einem hochschmelzenden Trägermetall einen Hafniumüberzug durch Reduktion einer Hafniumverbindung mit Hilfe eines Alkalimetalls herstellt. Man kann beispielsweise vom Oxyd des Hafniums ausgehen und das Oxyd durch Alkalimetalle reduzieren. Ein besonderer Vorteil des Verfahrens gemäß der Erfindung besteht darin, daß das Reduktionsmittel schon bei verhältnismäßig niedrigen Temperaturen verdampft und deshalb leicht von der Glühkathode entfernt «-erden kann, so daß es die Emission des Hafniums nicht beeinträchtigt.According to the invention, particularly effective hot cathodes are obtained from Hafnium, when you have a hafnium coating on a refractory metal Reduction of a hafnium compound using an alkali metal. One can for example, start from the oxide of hafnium and reduce the oxide with alkali metals. A particular advantage of the method according to the invention is that the Reducing agent evaporates and at relatively low temperatures can therefore easily be removed from the hot cathode, so that there is the emission of the hafnium is not affected.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES68115D DE466462C (en) | 1924-12-18 | 1924-12-18 | Process for the production of glow cathodes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DES68115D DE466462C (en) | 1924-12-18 | 1924-12-18 | Process for the production of glow cathodes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE466462C true DE466462C (en) | 1928-10-08 |
Family
ID=7500055
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DES68115D Expired DE466462C (en) | 1924-12-18 | 1924-12-18 | Process for the production of glow cathodes |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE466462C (en) |
-
1924
- 1924-12-18 DE DES68115D patent/DE466462C/en not_active Expired
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