The role of tungsten sheet

Tungsten is a non-ferrous metal, also belong to the important strategic metals, Kekai tungsten in ancient times known as rocks. Is discovered by Swedish chemist Carl William SheYeEr scheelite, tungstate and extract the new element, Depp son and later by spaniards found black tungsten ball also extract tungsten acid, in the same year, three oxide with carbon reduction for the first time in the tungsten powder, and naming the element. Amount of lines in the tungsten in the earth's crust is very low, have found containing tungsten alloy minerals has twenty kinds of tungsten deposit with granite magma activity. After refining the luster of the tungsten is silvery white metal, high melting point, hardness is very big. The mining of tungsten in the world today, about fifty percent is used for high quality steel smelting, about ten percent for making tungsten filament, about five percent of the used for other purposes, tungsten can manufacture guns, the rocket engine nozzle, cutting metal blades, drill bits, textile, military industry, aerospace, science and technology, various industrial fields. Is our common household light bulb, is made of tungsten wire. The main purpose of the tungsten tungsten and its alloys should be widely in electronic, electric light source industry. Used in the manufacture of all kinds of lighting bulbs, electronic lamp filament is used with a sagging resistance of doped tungsten wire. Adding metal rhenium doped tungsten wire, tungsten and molybdenium alloy is better than pure tungsten with high resistivity, beneficial willfulness, to used for tube lines, glass sealed lead.