Tungsten diselenide (WSe₂) is a kind of semiconductor material with a graphite-like layered structure. It is composed of closely packed Se-W-Se hexagonal crystals, and is based on van der Waals force to form a single layer of two-dimensional material. The WSe₂ film has a forbidden band width of 1-2eV and a high visible light absorption efficiency. It can be used as an absorbing layer and photoelectrochemical electrode material for solar cells.

Blue tungsten oxide is the main tungsten oxide product at present. It is the main raw material for making ultra pure and ultra-fine tungsten powder. It uses blue tungsten oxide to restore ultra pure tungsten powder, and its process includes four processes: calcination, reduction, acid washing and anti oxidation.

Tungsten, as a high temperature resistant metal material, is used as the filament or electrode of the energy saving lamp and as a variety of electronic emitter. But the tungsten itself has the problem of brittle and low plasticity, which greatly reduces the life of its use. In order to reduce the brittleness of tungsten and to improve its plasticity, the traditional method is to increase its properties by adding rare earth metals in tungsten to form tungsten based alloys.

Tungsten has high melting point, excellent thermal conductivity, low sputtering yield and high sputtering threshold, low vapor pressure and low tritium retention property. It is considered as the most promising divertor and first wall plasma facing material for fusion experimental device and fusion reactor in the future.

The specific surface area of tungsten oxide is the total surface area per unit mass tungsten oxide powder. It is commonly expressed by m²/g. It indirectly reflects the particle size and particle morphology of tungsten oxide powder, and it is an important index to measure the reaction ability of tungsten oxide powder with gas solid material during the reduction process.

In the production of traditional tungsten electrode and tungsten rod, steel mould is usually used for compaction, and then the tungsten strip is prepared by pre sintering and vertical melting sintering. The production mode has many disadvantages.

Tungsten billet mainly refers to pure tungsten, thorium tungsten, cerium tungsten, lanthanum tungsten, yttrium tungsten, zirconium tungsten, ternary composite (lanthanum, yttrium, cerium) and quaternary complex (lanthanum, yttrium, cerium, zirconium), is the production of tungsten electrodes and other raw materials rod.