The melting point of tungsten is very high and is the highest in all the alloy metals. Do you really know?
Tungsten is a chemical element, chemical symbol is W, atomic number is 74, is very hard, steel gray to white transition metal. The minerals containing tungsten are wolframite and scheelite. Tungsten has very strong physical characteristics, especially the high melting point, which is the highest of all non-alloy metals. Pure tungsten is mainly used in electrical and electronic equipment, and many of its compounds and alloys are used in many other applications (the most common are filament of light bulbs, tungsten in X-ray tubes and in superalloys). Tungsten is a rare metal with high melting point and belongs to the VIB family of the sixth cycle (second long period) in the periodic table. Steel tungsten is a nonferrous metal and an important strategic metal. Tungsten ore was called "heavy rock" in ancient times. In 1781, it was discovered by Swedish chemist Carl William Scheyer, and a new element acid, tungstic acid, was extracted. Tungstic acid was also extracted from wolframite discovered by the Spanish Depura in 1783. In the same year, tungsten powder was obtained for the first time by carbon reduction of tungsten trioxide, and the element was named. The amount of tungsten in the earthundefineds crust is 0.001. There are 20 kinds of tungsten minerals found. Tungsten deposits are usually formed with the activity of granitic magma. After smelting tungsten is silvery white gloss metal, melting point is extremely high, hardness is very large. The minerals containing tungsten are wolframite and scheelite. Tungsten has very strong physical characteristics, especially the high melting point, which is the highest of all non-alloy metals. Pure tungsten is mainly used in electrical and electronic equipment, and many of its compounds and alloys are used in many other applications (the most common are filament of light bulbs, tungsten in X-ray tubes and in superalloys). The three most stable isotopes of tungsten have recently been found to be slightly radioactive. Isotopes: five tungsten isotopes that occur in nature and have very long half-lives and can therefore be considered stable isotopes. All these isotopes can degenerate into hafnium by alpha decay. The half-life that can be measured so far is 180 W, and its half-life is 1.8 × 10 18 years, and no other isotopes have been observed to decay naturally. The half-life of forced degradation is 182 W, T 1 / 2 > 8.3 years, 184 W, T 1 / 2 > 29 years. 185 W, T 1 / 2 > 13 years, 186 W, T 1 / 2 > 27 years. So far their half-lives have been theoretical. On average, α -decay occurs twice a year in a gram of 180 W. At present, tungsten has 27 artificial radioisotopes, of which 181W is the most stable, its half-life is 121.2 days, 185W half-life is 75.1 days, 188W half-life is 69.4 days, and 178W half-life is 21.6 days. The half-lives of other radioisotopes are less than 24 hours, most of which are less than 8 minutes. History: tungsten is not only a nonferrous metal, but also an important strategic metal. Tungsten ore was called "heavy rock" in ancient times. In 1781, it was discovered by Swedish chemist Carl William Scheler, and a new element, tungstic acid, was extracted. Tungstic acid was also extracted from wolframite discovered by the Spanish Depura in 1783. In the same year, tungsten powder was obtained for the first time by carbon reduction of tungsten trioxide, and the element was named. The amount of tungsten in the earthundefineds crust is 0.001. There are 20 kinds of tungsten minerals found. Tungsten deposits are usually formed with the activity of granitic magma. After smelting tungsten is a silver glossy metal, melting point is very high, hardness is very large. Tungsten is the metal with the highest melting point. In the 1850 s, chemists discovered the influence of tungsten on the properties of steel. However, tungsten steel began to be produced and widely used in the late 19th and early 20th centuries. High speed steel was first exhibited at the Paris World Expo in 1900. Therefore, the tungsten extraction industry has developed rapidly since then. The appearance of this steel marks a major technological advance in the field of metal cutting. Tungsten became the most important alloying element. In 1900, Russian inventors suggested the use of tungsten in light bulbs. In 1909, tungsten was developed based on powder metallurgy and pressure-processing technology, and tungsten could be widely used in electric vacuum technology. From 1927 to 1928, cemented carbides were developed with tungsten carbide as the main component. This is an important stage in the development of tungsten industry. These alloys outperform the best tool steels in all aspects and are widely used in modern technology. Source: wolframite, scheelite, tungsten ore and other minerals containing tungsten. Important tungsten mines are located in Bolivia, California and Colorado, China, Portugal, Russia and South Korea. China produces 75% of the worldundefineds tungsten. Pure metals are obtained by using carbon to reduce tungsten oxides. The total amount of tungsten stored in the world is estimated to be 7 million tons, of which about 30% are wolframite and 70% are scheelite. But at present most of these deposits cannot be exploited economically. At current consumption, these deposits will last only about 140 years. Another way to get tungsten is to recycle it. The recovered tungsten is higher than the tungsten ore, and in fact it is very profitable. Chemical properties: tungsten is a rare metal with high melting point, which can improve the hardness of steel at high temperature. It belongs to the Ⅵ B family in the sixth cycle (second long period) of the periodic table of elements.
