In the field of inorganic semiconductor materials, cadmium sulfide is a typical semiconductor. The CdS photocatalyst has a band gap of 2.4 eV at room temperature, and the conduction band potential (-0.87 eV) and valence band potential (1.5 eV) can meet the conditions of complete photolysis of water. . Therefore, cadmium sulfide can improve the utilization of sunlight and become one of the most attractive semiconductor catalysts in sulfide systems.

Tungsten-copper composite is one of the heat sink materials widely used in power devices. It has good thermal conductivity and thermal expansion coefficient close to that of Si, GaAs and other semiconductor cores. Density of composites is the main factor affecting the electrical conductivity, thermal conductivity and expansion properties of composites, and it is also the key technical index.

Lactide is an important raw material for preparing high molecular weight polylactic acid. Its optical purity and chemical purity determine the quality of high molecular weight polylactic acid. At present, the two-step synthesis of lactide from lactic acid is widely used.

Tungsten carbide alloy has special corrosion resistance, high hardness and compressive strength. It is called modern industrial teeth and plays an extremely important role in machinery, metallurgy, precision instruments and military industries.

Tungsten alloy counterweight is a F1 specific tuning option and is now becoming the most popular material for balancing race cars. Tungsten heavy alloy is the best material to be used as counterweight which can be used in motor sport, because it has the good properties: high density with small volume, high temperature resistance, non-toxic and environmentally.

At present, the main methods for preparing Ti-W alloys are high temperature vacuum melting, powder metallurgy and mechanical alloying. However, these methods have some disadvantages, such as high production cost, complex process or low purity of products, which reduce the properties of Ti-W alloys and greatly limit their application.

Spherical tungsten carbide powder has high hardness, high wear resistance, acid and alkali resistance, high chemical stability. It has wide potential application value in fuel cell anode, cathode catalyst material, gas sensor, petroleum catalyst and photocatalyst material.

At present, waste tungsten is recycled by re-grinding inserts. But beyond a certain point, it is impossible to grind them again and the purity can not be improved. Therefore, further process is usually needed to complete the recovery of tungsten scrap.

Fluorescent powder has important application value in many sectors of national economy. The most widely used fluorescent lamp, followed by LED display screen. In addition, fluorescent powder can also be used on oscilloscopes and radar fluorescent screens, as well as electronic-photon converters, nuclear radiation displays and X-ray sensitization screens. In short, the use of fluorescent powder is extensive, and its scope of use is expanding year by year.

Vehicle exhaust contains a lot of nitrogen oxides. It not only causes acid rain, photochemical smog and other environmental problems, but also seriously threatens human health. Therefore, how to remove nitrogen oxides efficiently has become an important topic.