Tungsten, owing to its high melting point combined with high strength at elevated temperatures, high thermal conductivity and low sputtering yield, is being considered as one of most promising candidates for plasma facing wall material in future fusion reactors.

There are three types of tungsten wire application property: high temperature, room temperature and wire diameter consistency.  

It is known that preparation of tungsten carbide mainly consists of the following steps. Ammonium paratungstate (APT) is produced from ammonium tungstate solution through evaporation and crystallization, and then tungsten trioxide is produced by calcining APT, finally, tungsten carbide is prepared by hydrogen reduction and followed carbonization. Studies have showed a smaller particle size and uniform distribution of APT has a positive effect on the physical properties of tungsten carbide such as hardness, heat resistance, and wear resistance.

The doped tungsten wire is the wire that dopes certain amount of potassium and silicon into pure tungsten powder. It will not only increase the color temperature, luminous efficiency and life time of wire, but also has well anti sag propery, it can be used as special lamp filament with high working temperature such as halogen lamp. Provided that some alloy elements such as cobalt are added into the doped wire, the wire will have high strength and shock resistance. The wire is generally used in lighting system in vibration environment, lamps for various vehicles (motorcycles, automobiles, trains, airplanes, etc) as well as special light bulbs for military purposes, heating wires for aeroengine, etc.