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Tungsten The Advantages
Aug 03, 2017

The overall connection technique of tungsten and copper alloys restricts the development of divertor devices in nuclear fusion reactions. Tungsten How to combine the two without adding the middle of the material is a scientist who is a headache.

The device that continuously absorbs high calorie and particle streams from nuclear fusion plasmas is a divertor. Because of the excellent performance and reliability of heat transfer, this biasing device sets out a wave of research around the world. Bulk metal tungsten can be used as a divertor armor material, Tungsten which has the advantage of low hydrogen isotope retention and low sputtering efficiency. In the tungsten armor material on the back of the copper alloy connected to the water-cooled radiator, Tungsten in the heat transfer process, this device will expand and expand. They consider adding the same structure to the rotary reactor (FFHR-d1), Tungsten taking NIFS into consideration. In this way, the connection of tungsten and copper technology is essential. However, these two metals do not form an alloy. Between the two metals, the filler material was added as the connecting material and the material was heated to above 900 ° C. Since the thermal expansion of copper and tungsten is very different, Tungsten the intermediate material used to absorb thermal expansion needs to be added with the filler material. Until now people have not found no intermediate material can connect the two technology. But the addition of intermediate materials, will increase the connection interface and connection area, thereby weakening the structural strength, Tungsten resulting in increased costs, decreased heat performance and other issues.

The melting point of tungsten is the highest of all metal elements, the density (19.3 g / cm3) is very high, close to gold, tungsten hardness is also high, such as tungsten carbide hardness is close to the diamond. In addition, tungsten also has good electrical conductivity and thermal conductivity, Tungsten a small coefficient of expansion and other characteristics, which is widely used in alloys, Tungsten electronics, chemicals and other fields, of which tungsten carbide is the largest consumer of tungsten.

Approximately 50% of the tungsten ore mined in the world is used for the smelting of high quality steels, about 35% for the production of hard steels, about 10% for tungsten filaments, and about 5% for other uses. Tungsten can be used to make firearms, rocket push, into the nozzle, cutting metal blade, Tungsten drill bit, super hard mold, drawing die, etc., tungsten is widely used, involving mining, metallurgy, machinery, construction, transportation, electronics, chemical , Light industry, textile, military, aerospace, Tungsten science and technology, various industrial fields.

Tungsten in pure metal state and alloy state is widely used in modern technology, alloy state is the most important alloy steel, tungsten carbide-based carbide, wear-resistant alloy and hot alloy.

Tungsten, is the Swedish chemist community in 178l years with acid decomposition of tungolic acid found, but after sixty seven years, people only made pure metal tungsten. Pure tungsten is a silver-white metal, Tungsten only powder or filamentous tungsten is gray or black. Tungsten Light bulbs with a long time will be black, is due to a layer of tungsten inside the lamp powder. Tungsten is very heavy, 1 cubic meter of tungsten weighing 19.1 tons, and gold almost, so it is the original meaning of the Swedish, is "heavy" means. Tungsten Tungsten is very hard, people are the hardest stone - diamond for the drawing die, so that the diameter of 1 mm tungsten wire through more than 20 gradually small diamond hole, it was drawn into a diameter of only a few hundred Mm filament. One kilogram of tungsten ingots can be drawn into four hundred kilometers of filaments.

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