Sulfur hexafluoride is a colorless, odorless, non-toxic, non-combustible stable gas. Its chemical formula is SF₆. Its molecular weight is 146.07, and its density is 6.1 kg / m3 at 20 ° C and 0.1 MPa, which is about air. 5 times the density. Sulfur hexafluoride is gaseous at normal temperature and pressure, and its critical temperature is 45.6 ° C, the triple point temperature is -50.8 ° C, and the sublimation point temperature is -63.8 ° C at normal pressure. The molecular structure of sulfur hexafluoride is an octahedron arrangement, with small bonding distance and high bonding energy, so its stability is very high. When the temperature does not exceed 180 ° C, its compatibility with electrical structural materials is similar to nitrogen.
The main purpose
1. A new generation of ultra-high voltage insulation dielectric materials. As a good gas insulator, it is widely used for gas insulation of electronic and electrical equipment. Electronic grade high-purity sulfur hexafluoride is an ideal electronic etchant. It is widely used in the field of microelectronics technology and used as a plasma etching and cleaning agent in the manufacture of large integrated circuits such as computer chips and liquid crystal screens. It is used as a fluorine source for the production of fluorine-doped glass in the preparation of optical fibers and as a dopant for the isolation layer in the manufacture of low-loss high-quality single-mode fibers. It can also be used as a doping gas for a nitrogen excimer laser. Used as tracer, standard gas or prepared standard gas mixture in meteorology, environmental testing and other departments. Used as arc extinguishing and high capacity transformer insulation material in high voltage switches. Can also be used in particle accelerators and arresters. With its good chemical stability and no corrosion to the equipment, it can be used as a refrigerant in the freezing industry (operating temperature -45 ~ 0 ℃). Due to its high stopping ability for alpha particles, it is also used in radiochemistry. It also acts as a reverse sorbent to replace oxygen from coal dust.
2. It can be used for smelting and casting of non-ferrous metals, and can also be used for degassing and purification of aluminum and its alloy melts. In the microelectronics industry, sulfur hexafluoride can be used to etch silicon surfaces and remove organic or inorganic membranes from semiconductor materials. It can also be used as a dopant for single-film optical fiber isolation layers in the manufacture of optical fiber. The current interrupter with sulfur hexafluoride has a high rated voltage and is not easy to burn. In addition, sulfur hexafluoride is also used in various accelerators, ultra-high voltage storage batteries, coaxial cables and microwave transmission insulation media. At present, sulfur hexafluoride is a widely used tracer for the determination of atmospheric pollution, and the tracking distance can reach 100km. Sulfur hexafluoride has good chemical stability and does not corrode equipment. It can be used as a refrigerant in the refrigeration industry (operating temperature is between -45 and 0 ° C). It can be used as a refrigerant to replace Freon. It has no damage to the ozone layer and is environmentally friendly. And the performance requirements are a kind of refrigerant with great development potential. Used as a tracer for electrical insulation media and arc extinguishing agents to determine the degree of atmospheric pollution.
3. It is mainly used for arc extinguishing in high-voltage switches and as insulation material in large-capacity transformers and high-voltage cables. It can be used as a gas insulation material in nuclear particle accelerator and lightning arrester X-ray equipment. It has good chemical stability using SF6, does not corrode the equipment, and can be used as a refrigerant in the freezing industry (operating temperature is between -45 ～ 0 ℃). SF6 has a high stopping capacity for α-particles, so it is also used in radiochemistry; it can also be used as a reverse adsorbent to replace oxygen from coal dust.
4. Used as a gas insulator for electronic equipment and radar waveguides.