GB729921A - Improvements in and relating to tungsten cathodes - Google Patents
Improvements in and relating to tungsten cathodesInfo
- Publication number
- GB729921A GB729921A GB396352A GB396352A GB729921A GB 729921 A GB729921 A GB 729921A GB 396352 A GB396352 A GB 396352A GB 396352 A GB396352 A GB 396352A GB 729921 A GB729921 A GB 729921A
- Authority
- GB
- United Kingdom
- Prior art keywords
- wire
- tungsten
- furnace
- relating
- molybdenum mandrel
- 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
- 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
- H01J9/06—Machines therefor
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Solid Thermionic Cathode (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
729,921. Modifying metallic surfaces; cleaning and annealing tungsten. BRITISH THOMSON-HOUSTON CO., Ltd. Jan. 6, 1953 [Feb. 14, 1952], No. 3963/52. Classes 72 and 82 (2). To reduce brittleness in tungsten wire to be used as a cathode in an,electric discharge device, the wire W, primarily wound on a molybdenum mandrel, is passed through a chamber C in which its surface is oxidized by heating it to 900‹ C. by means of coal gas and excess air, then through a furnace D in which it is heated to 1350‹ C. in an atmosphere of humidified hydrogen, and then through an extension E of the furnace D through which hydrogen passes to cool the wire and prevent its re-oxidation. The molybdenum mandrel is then dissolved out in a mixture of acids.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB396352A GB729921A (en) | 1952-02-14 | 1952-02-14 | Improvements in and relating to tungsten cathodes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB396352A GB729921A (en) | 1952-02-14 | 1952-02-14 | Improvements in and relating to tungsten cathodes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB729921A true GB729921A (en) | 1955-05-11 |
Family
ID=9768188
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB396352A Expired GB729921A (en) | 1952-02-14 | 1952-02-14 | Improvements in and relating to tungsten cathodes |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB729921A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101672571B (en) * | 2009-10-20 | 2011-09-14 | 张均让 | Method for improving processing quality of tungsten and molybdenum materials and special hydrogen molybdenum wire furnace |
-
1952
- 1952-02-14 GB GB396352A patent/GB729921A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101672571B (en) * | 2009-10-20 | 2011-09-14 | 张均让 | Method for improving processing quality of tungsten and molybdenum materials and special hydrogen molybdenum wire furnace |
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