US1721169A - Manufacture of oxide cathodes - Google Patents
Manufacture of oxide cathodes Download PDFInfo
- Publication number
- US1721169A US1721169A US181619A US18161927A US1721169A US 1721169 A US1721169 A US 1721169A US 181619 A US181619 A US 181619A US 18161927 A US18161927 A US 18161927A US 1721169 A US1721169 A US 1721169A
- Authority
- US
- United States
- Prior art keywords
- film
- metal
- alkaline earth
- coating
- core
- 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 - Lifetime
Links
- 238000004519 manufacturing process Methods 0.000 title description 6
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 16
- 150000001342 alkaline earth metals Chemical class 0.000 description 16
- 239000011248 coating agent Substances 0.000 description 14
- 238000000576 coating method Methods 0.000 description 14
- 229910052751 metal Inorganic materials 0.000 description 14
- 239000002184 metal Substances 0.000 description 14
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 10
- 229910052802 copper Inorganic materials 0.000 description 10
- 239000010949 copper Substances 0.000 description 10
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 230000001590 oxidative effect Effects 0.000 description 8
- 229910052788 barium Inorganic materials 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 239000003870 refractory metal Substances 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 229910001092 metal group alloy Inorganic materials 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 2
- 239000005751 Copper oxide Substances 0.000 description 2
- QVQLCTNNEUAWMS-UHFFFAOYSA-N barium oxide Chemical compound [Ba]=O QVQLCTNNEUAWMS-UHFFFAOYSA-N 0.000 description 2
- 229910000431 copper oxide Inorganic materials 0.000 description 2
- 230000001376 precipitating effect Effects 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 239000000126 substance Substances 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
Definitions
- Serial Oxide cathodes are manufactured by first oxidizing superficially a core of a highly refractorymetal which does not easily form an alloy with any of the alkaline earth metals such, for example, as tungsten, or molybdenum and then contacting this surface with one or more of the alkaline earth metals, which subsequently are converted into their oxides.
- An improvement of this process is obtained by not superficially oxidizing the above-mentioned core of highly refractory metal itself but by first coating the said core with a film of a readily oxidized metal having a comparatively low pointof volatilization, oxidizing said film partially or entirely and subsequently coating the oxidized film with one or more of the alkaline earth metals. This coating is then heated to such a temperature that the metal of the film gives up its oxygen to the alkaline earth metal and-the metal of the film volatilizes. The alkaline earth metal is thereby converted into an oxide.
- The-core which, for "example, may be of tungsten or molybdenum may be coated, for. example, witha film of copper, which subsequently is converted, partially or entirely, into copper oxide.
- the alkaline earth metal is applied in a metallic state to the surface thus obtained. This may be effected in any manner known for this purpose, for example, by vapourizing barium and precipitating it on the core surface. On heating, 'an exchange of oxygen ensues between the copper and the barium, for which purpose additional supplementary oxygen or air may be applied, if desired, in order to oxidize the barium.
- odes comprising coating a core of a refractory metal or metal alloy which does not readily form an alloy'with any of the alkaline earth metals, with a film of a readily oxidized metal haying a comparatively low point of vola- I tlhzatlon, oxidizing partially or entirely the sa1d film, coating the-oxidized film with one or'more of the alkaline earth metals, and then heatlng to such a temperature that the al kalme earth metal is converted into oxide. and the metal of the film is volatilized.
- a process of manufacturing oxide cathodes comprising coating a core of a refractory metal or metal alloy which does not readily form an alloy with any of the alkaline earth metals, with a film of a readily oxidized metal having a comparatively low point of '70 volatilization, oxidizing partially or entirely the said film, coating the oxidized film with one or more of the alkaline earth metals by bringing the said film into contact with the vapour of one or more of the alkaline earth metals and precipitating the alkaline earth metal on the film, and then heating to such a temperature that the alkaline earth metal is i converted into oxide and the metal of. the film is volatilized.
- oxide cathodes comprising coating a core of refractory metalor metal alloy with a film of a readily oxidized metal having a comparative-- ly low point of volatilization, oxidizing the 5 said'film, coating the oxidized film with an alkaline earth metal, and then heating the coated core to such a temperature that the alkaline earth metal is converted into oxide,
- oxide cathodes which consists in coating a core of a metallic refractory substance which does not readily form an alloy with any of the alkaline earth metals, with a film of a readily oxidized metal, as copper, having a comparatively low point of volatilization, oxidizing the copper,
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Solid Thermionic Cathode (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL1721169X | 1926-04-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1721169A true US1721169A (en) | 1929-07-16 |
Family
ID=19873003
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US181619A Expired - Lifetime US1721169A (en) | 1926-04-06 | 1927-04-06 | Manufacture of oxide cathodes |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US1721169A (enrdf_load_stackoverflow) |
| BE (1) | BE340879A (enrdf_load_stackoverflow) |
| DE (1) | DE499670C (enrdf_load_stackoverflow) |
| NL (1) | NL21613C (enrdf_load_stackoverflow) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3515629A (en) * | 1966-09-30 | 1970-06-02 | Raytheon Co | Electrical device having intermediate dielectric layer |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4314312A1 (de) * | 1993-04-30 | 1994-11-03 | Teves Gmbh Alfred | Elektrohydraulische Druckregelvorrichtung |
-
0
- NL NL21613D patent/NL21613C/xx active
- BE BE340879D patent/BE340879A/xx unknown
-
1926
- 1926-10-12 DE DEN26448D patent/DE499670C/de not_active Expired
-
1927
- 1927-04-06 US US181619A patent/US1721169A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3515629A (en) * | 1966-09-30 | 1970-06-02 | Raytheon Co | Electrical device having intermediate dielectric layer |
Also Published As
| Publication number | Publication date |
|---|---|
| DE499670C (de) | 1930-06-12 |
| BE340879A (enrdf_load_stackoverflow) | |
| NL21613C (enrdf_load_stackoverflow) |
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