The development history of tungsten filament, the production of tungsten

The ** of tungsten wire is about a few hundred yuan per kilogram, and the cheap one is one or two hundred yuan. Tungsten filament in different application scenarios is also different. In terms of application scenarios, in addition to a small amount of tungsten filament used as a heating material for high-temperature furnaces, thermons for electron tubes and stiffeners for composite materials, most of them are used to make filaments for various incandescent lamps and tungsten halogen lamps and electrodes for gas discharge lamps.

For tungsten wire or tungsten rod used as the cathode of gas discharge lamp, in order to reduce its electronic escape work, the thorium that must be added is called tungsten thorium wire. Because thorium is a radioactive element that pollutes the environment, cerium is used instead of thorium to make tungsten cerium wire or tungsten cerium rod. However, the evaporation rate of cerium is high, so tungsten cerium wire or tungsten cerium rod can only be used for low-power gas discharge lamps.

Once the tungsten filament is used at high temperature and recrystallized, it becomes very brittle, and it is subjected to impact or vibration

Explanation of tungsten filament

Tungsten filament can be used as filament in light bulbs, electron tubes, etc. Detailed explanation Tungsten is the filament drawn after high-temperature smelting. It can be used as a filament in light bulbs, electron tubes, etc.

Word decomposition Explanation of tungsten Tungsten (tungsten) is a golden-black element, grayish-black crystal, hard and brittle, with a high melting point, which can be made into very fine wire and special alloy steel: tungsten wire. Tungsten.

Tungsten sand (tungsten ore made from refined chains). radical : 钅; Explanation of Silk Silk (silk) is something that silkworms spit out like thread, and is the raw material for weaving silk satin, etc

Silk. Silk. 缂 (?.)

Silk ( China is a kind of silk weaving handicraft. Also known as "carved silk"). Something like silk:

Wire. Mycelium. Pork.

Gossamer. Subtle, minimal: meticulous.

Long thoughts or.

After several years of development, China's tungsten mining production scale continues to expand, technology development capabilities, market competitiveness has reached a certain level, can produce a variety of tungsten ore products according to the needs of domestic and foreign users, and has achieved great results.

In 2006, the sales revenue of China's tungsten industry was 31.1 billion yuan, and the sales profit was 6.4 billion yuan, an increase of 7% over 2005. The sales revenue of 91 major tungsten enterprises in the country accounted for the whole industry, an increase of 20 percentage points over 2005, of which the sales revenue of mining, smelting, cemented carbide, tungsten and ferro-tungsten enterprises increased respectively. In 2006, China's tungsten export tons only increased compared with 2005, and the growth rate slowed down by one percentage point; Exports amounted to $100 million, up from 2005.

import tonnes, an increase over 2005; Imports amounted to $100 million, up from 2005. Net exports were tonnes, down from 2005; Net exports amounted to $100 million, an increase of 26 per cent over 2005. In 2006, 1 ton of tungsten products was exported, which was equivalent to 4 tons in 2002 and 2003, 3 tons in 2004 and tons in 2005.

In the first half of 2007, the production and operation of China's tungsten industry showed a steady and rapid development trend. From January to June 2007, the national tungsten concentrate output was 40,309 tons (equivalent to WO365%, the same below), an increase over the same period last year. From January to June 2007, the cumulative export of tungsten metal tons increased by 8% over the same period in 2006, and the export value was 100 million US dollars, a year-on-year increase.

The cumulative import of tungsten products (including tungsten concentrate) metal tons and imports of US dollars were increased compared with the same period in 2006. Exports of cemented carbide tons, compared with the same period of growth, exports of 10,000 US dollars, down year-on-year, average exports of ** US dollars, down year-on-year.

China's tungsten ore is a monopoly resource, but it does not obtain monopoly profits. The reason is that the structure of China's tungsten export products is unreasonable, the export is too much, and the first is cheap. Focusing on the export of primary products with low added value is the Achilles' heel of China's tungsten industry.

With the development of the market, China's tungsten industry product varieties are gradually complete, the market pattern and industrial layout are slowly standardized, and tungsten products are basically stable after more than two years. After 2008, industry consolidation is likely to accelerate, and this process also breeds greater investment opportunities.

Tungsten is a non-renewable resource, cheap and irrational mining, so that China's international status of tungsten is not high. Therefore, it is hoped that the state will strengthen the supervision of this industry and restrict exports.