GB190819311A - Improved Manufacture of Electric Incandescence Bodies of Tungsten. - Google Patents
Improved Manufacture of Electric Incandescence Bodies of Tungsten.Info
- Publication number
- GB190819311A GB190819311A GB190819311DA GB190819311A GB 190819311 A GB190819311 A GB 190819311A GB 190819311D A GB190819311D A GB 190819311DA GB 190819311 A GB190819311 A GB 190819311A
- Authority
- GB
- United Kingdom
- Prior art keywords
- tungsten
- nickel
- tungstate
- alloy
- vacuum
- 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
Landscapes
- Fats And Perfumes (AREA)
- Powder Metallurgy (AREA)
Abstract
19,311. Siemens & Halske Akt.-Ges. Sept. 26, 1907, [date applied for under Section 91 of Patents &c. Act, 1907]. Incandescent lamps.-Tungsten incandescencebodies are made from nickel tungstate by reducing it to an alloy or intimate mixture of tungsten and nickel, and subsequently removing the nickel, after working, by passage of current in a vacuum. The tungstate may be mixed with powdered tungsten, or with tungstic acid or a like reducible compound, to obtain a suitably proportioned ductile alloy. This may contain from 5 to 20 per cent of nickel, 12 per cent being preferred. Reduction may be effected by heating in a stream of hydrogen, the temperature being raised to about 1650‹ C. for a short time to form the alloy. If plastic colloidal tungsten compounds such as are described in Specifications Nos. 11,716 and 16,489, A.D. 1907, and No. 11,710, A.D. 1908, are mixed with the tungstate, rods or filaments may be made without any other binder, and, after reduction and sintering, may be drawn or rolled and heated electrically, preferably in a vacuum, to expel the nickel.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE190819311X | 1907-09-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB190819311A true GB190819311A (en) | 1908-12-10 |
Family
ID=32604012
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB190819311D Expired GB190819311A (en) | 1907-09-26 | 1908-09-14 | Improved Manufacture of Electric Incandescence Bodies of Tungsten. |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB190819311A (en) |
-
1908
- 1908-09-14 GB GB190819311D patent/GB190819311A/en not_active Expired
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