Silicon carbide ceramics of bulletproof plates

- Aug 01, 2019-

High-strength, lightweight silicon carbide has long been regarded as the ideal material for making bulletproof equipment. Silicon carbide (SiC) has two main crystal structures, namely, the beta-SiC of the cubic crystal system and the alpha-SiC of the hexadecimal crystal line, silicon carbide is a compound with a strong covalent bond, and its Si-C bond iontype is only about 12%, so compared to other ceramics such as alumina, boron carbide, etc., it has better mechanical properties, antioxidant properties Higher wear resistance and low coefficient of friction, in addition to its good thermal stability, high temperature strength, low coefficient of thermal expansion, high thermal conductivity and heat shock and chemical corrosion resistance and other excellent characteristics by the military experts of various countries, and widely used. But its fatal weakness of low toughness is still an urgent problem to be solved. The molecular structure and characteristics of silicon carbide determine the characteristics of its low toughness, when hit by a bullet, its super-high strength can resist the huge bullet kinetic energy, and instantly crushed the bullet, but its low toughness characteristics will make it in the moment of impact of the cracking or even breaking into pieces, This allows silicon carbide ceramic plates to be used only as disposable plates, usually not resistant to multiple shots in a row. But many researchers in the field of material molecular science now say that this low toughness of silicon carbide is theoretically compensated and overcome by controlling the sintering process and ceramic fiber preparation. This will greatly broaden the application of silicon carbide in the field of bulletproof, making it the most ideal material for the manufacture of bulletproof equipment.