Tungsten trioxide is a semiconductor nanomaterial with indirect band gap transition. It has good photoelectric and gas sensing properties. In order to make full use of the photoelectric properties of tungsten trioxide, porous tungsten trioxide nanomaterials with regular morphology and high specific surface area need to be prepared.

Tungsten silicide (W5Si3) is also known as a tetragonal silicon, which is a kind of tetragonal crystal. It is a very promising high-temperature structural material and electrode material.

As an important part of metal tungstate nanomaterials, calcium tungstate nanomaterials have unique crystal structure and remarkable nano-effects, so they have important application value in the field of catalytic oxidation and photochromism.

Since Levy and Boudart first disclosed the similarity of catalytic properties between tungsten carbide and platinum in 1973, the catalytic properties of tungsten carbide have aroused great interest in the scientific community. So far, the application of tungsten carbide as a catalyst has been extensively studied experimentally and theoretically. The results show that tungsten carbide has good catalytic performance in a series of noble metal catalytic reactions.

Cadmium selenide nanocrystals are the most widely studied and promising class of II-VI semiconductor nanocrystals. They have attracted worldwide attention due to their important non-linear optical properties, luminescent properties and other physical and chemical properties.

In recent years, in the application of automobile, energy and other fields, materials need to have the properties of corrosion resistance, high temperature resistance, heat conduction and so on. Special ceramics are needed to meet the development of its application. Zirconium tungstate material has negative expansion. It has strong isotropic negative thermal expansion effect in the temperature range of 0.3-1050K. Its negative thermal expansion coefficient (NTE) is -9*10-6K^-1, which is one of the hotspots in the research of negative expansion materials.

With the development of science and technology, the preparation and processing methods of materials have made great progress. Arc plasma technology is a process that has been rapidly popularized in recent years. It is widely used in industrial fields such as plasma welding, cutting, spraying, melting and other materials preparation and processing, as well as emission electric light sources, microwave power tubes, vacuum tubes, and ion bodies. Fields such as propellers.

At present, wolframite is the main resource consumed in tungsten smelting in China, and the basic reserves of wolframite resources will be exhausted in a few years. In addition, most of the newly discovered tungsten resources are complex scheelite resources, which has shown the absolute predominance of scheelite. Therefore, the development of scheelite resources to replace wolframite is a strategic choice for the sustainable development of tungsten industry in China.

Ultrafine grained tungsten-cobalt cemented carbide has high hardness and high strength, which is widely used in many fields such as woodworking tools, dental tools, metal processing and wear-resistant materials. The properties of ultrafine cemented carbides are closely related to grain size.

Superalloy is a kind of alloy based on iron, nickel and cobalt, serving in high temperature environment, withstanding severe mechanical stress and having good surface stability. It is not only the key material for high temperature components of Aeronautical and aerospace engines, but also the indispensable important material for naval ships, energy, petrochemical and other industrial fields.