Tungsten was identified as a new element in 1781, and it was the first isolated as a metal in 1783.There are two important tungsten ores include wolframite and scheelite.Tungsten has the highest melting point of all the non-alloyed metals and the 2nd highest melting point of all the elements after carbon. Also tungsten metal has high density of 19.3 g/cc which is comparable to that of uranium and gold, and it is much higher about 2 times than that of lead.
Most of tungsten chemical compounds are Tungsten oxides and tungsten trioxides(WO3), tungsten oxides are always named tungsten intermediate products they are tungstic acid, ammonium paratungstate (APT, tungsten oxide content 88.5% );ammonium metatungstate (AMT), sodium tungstate,yellow tungsten oxide (YTO),blue tungsten oxide (BTO), tungsten trioxide (WO3), violet tungsten oxide (VTO). The other tungsten chemical compounds are most often used industrially as tungsten catalysts, there are tungstic anhydride,pure tungsten oxide, extra pure tungsten oxide (refined tungsten oxide) yellow-green tungsten oxide, Tungstic acid anhydride (Wolframic acid anhydrous, Wolframic acid anhydride), puratronic tungsten(vi) oxide,etc.
Tungsten metal it is also named pure tungsten, the unalloyed elemental form of tungsten is used mainly in electrical applications, for example, most notably in incandescent tungsten light bulb filaments, X-ray tubes (as both the tungsten filament and tungsten target), tungsten electrodes and also tungsten metal always used in tungsten steel.
All tungsten sintered products are made by the method of powder metallurgy (PM), tungsten powder is the most important raw materials and the starting point for tungsten mill products. Tungsten powder is made from tungsten oxide and by roasting and heating in a hydrogen atmosphere. Purity, Oxygen, grain size are very important for tungsten powder. With mixing other element powder,Tungsten powder can be made into a variety of tungsten alloy. Another important application of the tungsten powder is made of tungsten carbide powder which is major materials of madding tungsten carbide sintered products.
Tungsten metal has many different alloys which have numerous applications. Tungsten alloy always called super alloys, for the high density and nice TRS of tungsten alloy may used as military applications in penetrating projectiles, aircraft and helicopter jets’ parts, aircraft and helicopter breaking plates and shoes, and our tungsten alloy swaged rod with perfect physical properties can be used for bullets of antitank missiles and canons’ bullet, especially tungsten alloy cubes can be used for smart bomb (e.g. AHEAD); and other military applications. Also, tungsten alloy always used as tungsten alloy counterweight and tungsten alloy balance weight, the main application of tungsten alloys are as followings: