High-purity high density blue tungsten oxide’s production equipment is determined by its production process in industry, including alkali decomposition furnace, plate and frame filter press, ion exchange column, spray drying tower and reduction furnace, etc. Industrial production of blue tungsten oxide mainly through alkali decomposition, filter, ion exchange, dry and reduction and other processes.

Industrial grade blue tungsten oxide is a blue powder with an average particle size of less than 100nm and purity higher than 99.95%.

99.95% blue tungsten oxide is a higher grade of blue tungsten oxide powder with oxygen index of 2.73~2.87.

Electrochromism of nanotungsten oxide is an electron injection effect. Oxygen ions have a conductive effect in nano-tungsten oxide. When an oxygen ion near the negative electrode leaves the original position, the corresponding tungsten ion becomes a highly active ion.

Both tantalum and tantalum doped tungsten oxide ceramics have relatively high dielectric constants. It is generally believed that there is a high-resistance insulating layer between the crystal grains and grains of these oxide ceramics, that is, a so-called grain boundary layer barrier capacitor, and therefore has a high dielectric constant.

To use tungsten oxide as a low-voltage capacitor-varistor material in practice, it is necessary to solve the problem of its electrical stability. Previous research shows that the electrical properties of tungsten trioxide are not stable. In the case of high electric fields, there is a serious problem of electrical degradation. The current decays with time under constant voltage and there is a serious hysteresis. Obstructed its application as a varistor material in practice.