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Silicon carbide-From rocks in space to rocks on your finger

2019-08-23
Silicon carbide, chemical formula is SiC, commonly known as emery, the name of the gemstone, is a ceramic-like compound in which silicon and carbon are bonded. Silicon carbide exists in nature as a rare mineral such as moissanite.

Silicon carbide (SiC), also known as carborundum, is a semiconductor containing silicon and carbon. It occurs in nature as the extremely rare mineral moissanite. Synthetic SiC powder has been mass-produced since 1893 for use as an abrasive. Grains of icon carbide can be bonded together by sintering to form very hard ceramics that are widely used in applications requiring high endurance, such as car brakes, car clutches and ceramic plates in bulletproof vests. Electronic applications of silicon carbide such as light-emitting diodes (LEDS) and detectors in early radios were first demonstrated around 1907. SiC is used in semiconductor electronics devices that operate at high temperatures or high voltages, or both. Large single crystals of silicon carbide can be grown by the Lely method and they can be cut into gems known as synthetic moissanite.
 
Natural occurrence
Naturally occurring moissanite is found in only minute quantities in certain types of meteorite and in corundum deposits and kimberlite. Virtually all the silicon carbide sold in the world, including moissanite jewels, is synthetic Natural moissanite was first found in 1893 as a small component of the Canyon Diablo meteorite in Arizona by Dr. Ferdinand Henri Moissan, after whom the material was named in 1905 n Moissan's discovery of naturally occurring SiC was initially disputed because his sample may have been contaminated by silicon carbide saw blades that were already on the market at that time.

While rare on Earth, silicon carbide is remarkably common in space. It is a common form of stardust found around carbon-rich stars, and examples of this stardust have been found in pristine condition in primitive (unaltered) meteorites. The silicon carbide found in space and in meteorites is almost exclusively the beta-polymorph. Analysis of SiC grains found in the Murchison meteorite, a carbonaceous chondrite meteorite, has revealed anomalous isotopic ratios of carbon and silicon, indicating that these grains originated outside the solar system.
 
Abrasive
Due to its super-hard performance, it can be prepared into various grinding wheels, abrasive cloths, sandpapers and various abrasives, which are widely used in the machining industry. China's industrial silicon carbide is mainly used for abrasives. Abrasives made of black silicon carbide are used for cutting and grinding materials with low tensile strength, such as glass, ceramics, stone and refractory. They are also used in cast iron parts and non-ferrous metals. Grinding tools made of green silicon carbide are mostly used for grinding of hard alloys, titanium alloys and optical glass. They are also used for honing of cylinder liners and fine grinding of high speed steel tools.
Deoxidizer
In steelmaking, ferrosilicon is usually used for deoxidation. In recent times, silicon carbide has been used instead of ferrosilicon as a deoxidizer. The steel produced is of better quality and more economical. Since deoxidation with silicon carbide, the slag formation is small and fast, and the content of some useful elements in the slag is effectively reduced, and the steelmaking time is short and the composition is better controlled. Deoxidizer black silicon carbide is commonly used in the steel industry in countries such as the United States and Japan. The materials suitable for the deoxidizer generated by the silicon carbide for abrasive or refractory materials in the furnace can be all sold for production without returning to the furnace, and the comprehensive utilization rate of the products is high, and the economic effect of the silicon carbide production is excellent.
 
Electrical and electrician
Utilizing the high thermal conductivity of silicon carbide ceramics, the greening property is good as a substrate and packaging material for large-scale integrated circuits. The silicon carbide heating element is a commonly used heating element. Because of its simple operation, long service life and wide application range, it is the most durable and inexpensive one in the heating material, and can be used up to 1600 °C. Silicon carbide can also be used as a valve body and a far-infrared generator for lightning arresters.
 
Conclusion
The application of silicon carbide yang porcelain in many industrial fields has shown its excellent performance, which has attracted widespread attention. Silicon carbide ceramics are a large family in the field of inorganic non-metallic materials, and their tentacles extend almost all industrial fields.