GB1446744A - Production of tungsten wire coils - Google Patents
Production of tungsten wire coilsInfo
- Publication number
- GB1446744A GB1446744A GB5483573A GB5483573A GB1446744A GB 1446744 A GB1446744 A GB 1446744A GB 5483573 A GB5483573 A GB 5483573A GB 5483573 A GB5483573 A GB 5483573A GB 1446744 A GB1446744 A GB 1446744A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coil
- production
- tungsten wire
- wire coils
- kmno
- 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
- H01J9/08—Manufacture of heaters for indirectly-heated cathodes
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/16—Acidic compositions
- C23F1/26—Acidic compositions for etching refractory metals
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Resistance Heating (AREA)
- Luminescent Compositions (AREA)
Abstract
1446744 Dissolving Mo HITACHI Ltd 26 Nov 1973 54835/73 Heading C7E [Also in Divisions B3 and B6] In the manufacture of coil heaters for electronic tubes or coil filaments for electric lamps or fluorescent tubes, a W wire (which for coil heaters may be coated with Al 2 O 3 ) is wound round a Mo core to make a coil, and the Mo core is then removed by dissolving it in HNO 3 with or without H 2 SO 4 , and in the presence of (NH 4 ) 2 S 2 O 8 , H 2 O 2 and/or KMnO 4 . Preferably where the W wire is alumina coated, (NH 4 ) 2 S 2 O 8 or H 2 O 2 is used rather than KMnO 4 to prevent Mn oxide contamination of the alumina. The 3 additives suppress nitrogen oxide discharge into the atmosphere.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5483573A GB1446744A (en) | 1973-11-26 | 1973-11-26 | Production of tungsten wire coils |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5483573A GB1446744A (en) | 1973-11-26 | 1973-11-26 | Production of tungsten wire coils |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1446744A true GB1446744A (en) | 1976-08-18 |
Family
ID=10472217
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5483573A Expired GB1446744A (en) | 1973-11-26 | 1973-11-26 | Production of tungsten wire coils |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1446744A (en) |
-
1973
- 1973-11-26 GB GB5483573A patent/GB1446744A/en not_active Expired
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TW221984B (en) | ||
| ATE87596T1 (en) | RARE EARTH TRIFLUORIDE WITH NEW MORPHOLOGICAL CHARACTERISTICS AND PROCESS FOR ITS PRODUCTION. | |
| GB1211179A (en) | Improvements in or relating to electric lamps | |
| GB465119A (en) | Improvements in the manufacture of coiled-coil filaments for incandescent electric lamps and the like | |
| ZA912261B (en) | Process for the production of rare earth ammonium double oxalates and their uses for the production of rare earth oxides,double oxalates and oxides obtained | |
| GB1446744A (en) | Production of tungsten wire coils | |
| DE69129143T2 (en) | Process for the preparation of mixed oxalates of ammonium and rare earths and their use for the production of rare earth oxides and the rare earths thus produced | |
| GB1336829A (en) | Filamentary electrode and fabrication thereof | |
| GB1325658A (en) | Electric filament lamp | |
| GB1136949A (en) | Improvements in electric incandescent lamp and filament | |
| GB1062819A (en) | Incandescent lamps using coiled-coil filaments | |
| GB929596A (en) | Method for the production of incandescent lamp filaments | |
| GB967273A (en) | Improvements in cathodes and in the method of their manufacture | |
| JPS5228859A (en) | Green fluorescent display tube excited by slow electron bemm | |
| GB638805A (en) | Improvements in and relating to electric incandescent lamps | |
| GB948859A (en) | Improvements in and relating to incandescent lamps | |
| GB1245490A (en) | Fluorescent lamp cathode | |
| GB1092405A (en) | Method of making lamp filaments | |
| GB536902A (en) | Improvements in wires or bands of refractory metal and in the production thereof | |
| GB792365A (en) | Improvements in and relating to electric discharge devices | |
| GB1443691A (en) | Method and apparatus for manufacturing bent filaments for incan descent lamps | |
| GB534629A (en) | Process for the manufacture of gas-filled coiled coil electric incandescent lamps | |
| JPS5323178A (en) | Method of productin g ultraviolet-free fluorecent lamp | |
| GB1076017A (en) | Improvements in or relating to methods of manufacturing chains of filaments for incandescent lamps | |
| GB190009944A (en) | Improvements in Incandescent Electric Lamps. |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| 435 | Patent endorsed 'licences of right' on the date specified (sect. 35/1949) | ||
| PCNP | Patent ceased through non-payment of renewal fee |