GB595274A - Improvements in and relating to electric discharge lamps - Google Patents
Improvements in and relating to electric discharge lampsInfo
- Publication number
- GB595274A GB595274A GB503045A GB503045A GB595274A GB 595274 A GB595274 A GB 595274A GB 503045 A GB503045 A GB 503045A GB 503045 A GB503045 A GB 503045A GB 595274 A GB595274 A GB 595274A
- Authority
- GB
- United Kingdom
- Prior art keywords
- temperature
- tungsten
- electrode
- electric discharge
- mesh
- 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
- 229910052776 Thorium Inorganic materials 0.000 abstract 3
- ZSLUVFAKFWKJRC-UHFFFAOYSA-N thorium Chemical compound [Th] ZSLUVFAKFWKJRC-UHFFFAOYSA-N 0.000 abstract 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 abstract 3
- 229910052721 tungsten Inorganic materials 0.000 abstract 3
- 239000010937 tungsten Substances 0.000 abstract 3
- 239000011248 coating agent Substances 0.000 abstract 2
- 238000000576 coating method Methods 0.000 abstract 2
- 239000000843 powder Substances 0.000 abstract 2
- 239000000725 suspension Substances 0.000 abstract 2
- PGMYKACGEOXYJE-UHFFFAOYSA-N Amyl acetate Chemical compound CCCCCOC(C)=O PGMYKACGEOXYJE-UHFFFAOYSA-N 0.000 abstract 1
- 239000000020 Nitrocellulose Substances 0.000 abstract 1
- 229940072049 amyl acetate Drugs 0.000 abstract 1
- 239000010406 cathode material Substances 0.000 abstract 1
- 238000004140 cleaning Methods 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract 1
- 229910052739 hydrogen Inorganic materials 0.000 abstract 1
- 239000001257 hydrogen Substances 0.000 abstract 1
- 239000004615 ingredient Substances 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 229920001220 nitrocellulos Polymers 0.000 abstract 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)
- Discharge Lamp (AREA)
Abstract
595,274. Cathode materials and processing. GENERAL ELECTRIC CO., Ltd., HOARE, P. A., and NELSON, E. H. Feb. 28, 1945, No. 5030. [Class 39 (i)] A method of coating an electric discharge lamp electrode with an emissive material comprises the steps of coating a tungsten electrode with a suspension containing thorium powder, but substantially no other metallic ingredient, and heating the coated electrode to a temperature above 1800‹ C., in an atmosphere which is inert to the tungsten and thorium. In the example given, a tungsten coil is cleaned and painted with a suspension containing thorium powder at least as fine as 150 mesh and preferably 200 mesh, the suspending medium being, for example, 10 per cent solution of nitrocellulose in amyl acetate. When dry, the coated coil is heated in an atmosphere of dry hydrogen at atmospheric pressure to a temperature in the range 1580‹ to 1620‹ C., preferably 1600‹ C., for 1 minute, and the temperature is then raised to a temperature in the range 1830‹ to 1870‹ C., preferably 1850‹ C., which is maintained for a further minute. Specifications 230,226, 240,213 and 306,281, [all in Class 39 (i)], are referred to.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB595274A true GB595274A (en) | 1947-12-01 |
Family
ID=1628185
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB503045A Expired GB595274A (en) | 1945-02-28 | Improvements in and relating to electric discharge lamps |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB595274A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111850524A (en) * | 2020-07-17 | 2020-10-30 | 广东威特真空电子制造有限公司 | Rare earth tungsten cathode and preparation method and application thereof |
-
1945
- 1945-02-28 GB GB503045A patent/GB595274A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111850524A (en) * | 2020-07-17 | 2020-10-30 | 广东威特真空电子制造有限公司 | Rare earth tungsten cathode and preparation method and application thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3037923A (en) | Process for electrophoretically coating a metal with particulate carbon material | |
| US2298968A (en) | Fluorescent coating and method of manufacture | |
| GB595274A (en) | Improvements in and relating to electric discharge lamps | |
| GB666053A (en) | Improvements in or relating to thermionic cathodes | |
| US2516841A (en) | Grid for electron discharge devices | |
| GB848340A (en) | Electric circuit including an improved electric-discharge tube | |
| US2707687A (en) | Method of forming luminescent coating | |
| GB587039A (en) | Improvements in and relating to the electrophoretic coating of metal articles | |
| GB652742A (en) | Gaseous electron discharge device | |
| GB626357A (en) | Improvements in or relating to methods of forming metal coatings on bases of ceramic, refractory or high melting point vitreous material | |
| GB1042184A (en) | Fluorescent discharge lamp | |
| US3041210A (en) | Method of making cold cathodes for vacuum tubes and article | |
| GB582729A (en) | Improvements in or relating to methods of applying emissive coatings to the cathodes of electronic discharge devices | |
| US2352137A (en) | Electron emitting element | |
| GB644368A (en) | Improvements relating to the coating of articles electrophoretically | |
| GB634187A (en) | Improvements relating to the coating of metal filaments with electron-emissive materials | |
| GB616487A (en) | Improvements in or relating to electron emission filaments | |
| GB851595A (en) | Improvements relating to electric discharge lamps | |
| GB824902A (en) | Improvements in cathodes and emissive material therefor | |
| GB843102A (en) | Improvements in or relating to the manufacture of tubes | |
| GB966526A (en) | Improvements in or relating to the manufacture of low pressure mercury vapour fluorescent electric discharge lamps | |
| GB596887A (en) | Improvements in and relating to thermionic valves | |
| GB705126A (en) | Improvements in or relating to cathodes for electric discharge tubes | |
| GB550856A (en) | Improvements in or relating to closure members for vacuum tubes | |
| GB698853A (en) | Improvements in electric discharge tubes |