Gas Description
Sulfur hexafluoride is a colorless, odorless, non-toxic, and non flammable stable gas. Its chemical formula SF ₆ has a molecular weight of 146.07 and a density of 6.1kg/m3 at 20 ℃ and 0.1 MPa, which is about 5 times the density of air. Sulfur hexafluoride is in a gaseous state at room temperature and pressure, with a critical temperature of 45.6 ℃, a triple point temperature of -50.8 ℃, and a sublimation point temperature of -63.8 ℃ at atmospheric pressure. The molecular structure of sulfur hexafluoride is arranged in an octahedral shape, with a small bonding distance and high bonding energy. Therefore, its stability is very high. When the temperature does not exceed 180 ℃, its compatibility with electrical structural materials is similar to that of nitrogen gas.
The main uses of sulfur hexafluoride
1. New generation of ultra-high voltage insulation dielectric materials. As a good gas insulator, it is widely used for gas insulation in electronic and electrical equipment. Electronic grade high-purity sulfur hexafluoride is an ideal electronic etchant widely used in the field of microelectronics, as a plasma etching and cleaning agent in the manufacturing of large integrated circuits such as computer chips and LCD screens. Used as a fluorine source in the production of fluorine doped glass in fiber optic preparation, and as a dopant in the isolation layer in the manufacturing of low-loss high-quality single-mode fibers. It can also be used as a doping gas for nitrogen excimer lasers. Used as a tracer, standard gas, or prepared standard mixture in meteorological, environmental monitoring, and other departments. Used as insulation material for arc extinguishing and high-capacity transformers in high-voltage switches. It can also be used in particle accelerators and lightning arresters. Due to its good chemical stability and non corrosion to equipment, it can be used as a refrigerant in the refrigeration industry (operating temperature between -45~0 ℃). Due to concerns about α Particles have a high stopping ability and are also used in radiochemistry. In addition, it also serves as an anti adsorbent to replace oxygen from mine coal dust.
2. It can be used for smelting and casting processes of non-ferrous metals, as well as for degassing and purifying molten aluminum and its alloys. In the microelectronics industry, sulfur hexafluoride can be used to etch silicon surfaces and remove organic or inorganic film like substances from semiconductor materials. It can also be used as a doping agent for single film fiber isolation layers in the manufacturing process of optical fibers. Current interrupters with sulfur hexafluoride have a high rated voltage and are not easily combustible. In addition, sulfur hexafluoride is also used as an insulating medium for various accelerators, ultra-high voltage storage devices, coaxial cables, and microwave transmission. At present, sulfur hexafluoride is a widely used tracer for measuring atmospheric pollution, with a tracking distance of up to 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 between -45~0 ℃) to replace Freon. It has no destructive effect on the ozone layer and meets the requirements of environmental protection and performance. It is a refrigerant with great development potential. Used as an electrical insulation medium and arc extinguishing agent, as a tracer for measuring the degree of atmospheric pollution.
3. 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 an insulating material for gas in nuclear particle accelerators and lightning arrester X-ray equipment. SF6 has good chemical stability and is not corrosive to equipment. It can be used as a refrigerant in the refrigeration industry (operating temperature between -45~0 ℃),SF6 pairs α- Particles have a high stopping ability, so they are also applied in radiochemistry; It can also be used as an adsorbent to replace oxygen from mine coal dust.
4. Used as a gas insulator for electronic devices and radar waveguides.
