To explain the basics of tungsten metal

Family in the non-ferrous metals, tungsten maintain the "high-temperature Champion" long centuries. The world's first discovery of tungsten, the Swedish chemist Club Le. He first used in 1781 tungstate acid decomposition obtained tungsten element. Then, and after a period of painstaking research, only in 1848 the system out of pure tungsten. Pure tungsten silver-white, very beautiful, the proportion 19.1t/m3. Superior performance of tungsten is chemically stable, even in heated situations, nor and hydrochloric acid, sulfuric acid works, even in aqua regia will not be dissolved. Tungsten temperature, known as the hardest natural metal melting, melting point up to 3410 ℃; hardness of tungsten metal in the top, only heated to a high temperature in order to pressure processing. Uses unique tungsten has many unique uses, such as high hardness, tungsten carbide inserts, tungsten steel can be manufactured. Tungsten steel tools, high strength than ordinary steel tools several times or even several times; tungsten steel barrel, barrel, firing in a row, even when the barrel is too hot projectile friction, can still maintain good flexibility and mechanical strength. In the metal cutting machine tools, turning tools made of tungsten steel, temperature up to 1000 ℃ still hard as before. A solution of 3% to 15% of tungsten, tungsten-chromium-cobalt alloy plating or welding the parts of the surface of ordinary steel, it is equivalent to the parts wear hard "armor", both temperature compressive strength, but also resistance to corrosion, reduces wear life can be extended several times. Because of the superior properties of tungsten steel and broad purpose, the world's annual production of tungsten, 90% are used to produce tungsten steel. Tungsten plasticity. A 1 kg weight of tungsten rod, you can pull grow about 400 km, diameter of only 1% mm filaments. Such filaments at 3000 ℃ high temperature environment, still has a certain intensity, and high light, long life, is to create a variety of light bulb filament of good material. Incandescent, tungsten, and even the world's most innovative lamps, are manufactured with tungsten. The United States has used a new type of solid fuel, the rocket gas temperature exceeds 3000 ℃. In this case, the hardest melting tungsten nozzle too overwhelming. Scientists through research, manufacturing a new type of tungsten alloy - "self-cooling permeability porous tungsten alloy of silver." When the rocket flying high in the air, this new alloy with high temperature and pressure nozzle, spray continuously sparkling flames. The nozzle surface infiltration of silver at a high temperature first evaporated while absorbing the heat of evaporation. Thus, to achieve automatic cooling purposes and to prevent excessive temperature rise, the badly baked nozzle 3000 ℃ high temperature, is still able to maintain the original character.