High purity tungsten above 5N has high resistance to electron migration, high-temperature stability and the formation of stable silicides. It is widely used in gate circuit electrode materials of large-scale integrated circuits. At present, there are two key points in the preparation of high purity tungsten powder by hydrogen reduction method: one is the improvement of smelting and purification technology, and the purity of raw materials meets the requirements of corresponding purity; the other is the cleanliness of the preparation process of tungsten powder, so as to reduce the pollution of impurities in the production process.

Silver-tungsten materials are generally used in low-voltage plastic case circuit breakers, universal circuit breakers and protective switches, as moving contacts. Silver-tungsten materials are usually fabricated by infiltration process in powder metallurgy, such as the steps of making AgW₅₀ materials: (1) silver and tungsten powder are mixed into AgW₇₀ powder according to 3:7; (2) pressing AgW₇₀ porous skeleton; (3) adding silver plate to obtain dense AgW₅₀ materials by high temperature infiltration, and the silver content of waste materials produced in the production process is generally between 20-50%. Separation and recycling are needed.

Nanomaterials refer to materials (1-100 nm) with at least one dimension within the nanoscale in three-dimensional space. According to the classification of space dimension, nanomaterials can be divided into zero dimension, one-dimensional, two-dimensional and so on. Zero dimensional tungsten oxide mainly refers to nano tungsten oxide powders.

At present, lithium-sulfur battery is a kind of battery system with high energy density. Its theoretical energy density is as high as 2600Wh/Kg, which is much higher than other lithium-ion battery systems. Usually, lithium sulfur battery uses sulfur or sulfur based composite as positive electrode and lithium metal as negative electrode. Lithium-sulfur batteries have become a hot spot in battery research because of their high theoretical specific capacity (1675 mAh / g), low price, abundant reserves and relatively friendly environment.