Black silicon carbide grain for bulletproof armor
A soft bulletproof vest can only protect against low-speed bullets. For high-speed bullets or some steel core bullets fired from rifles, it can get bulletproof by inserting hard shields at key positions based on soft bulletproof vests. At present, hard guard armor made from Silicon carbide composite ceramic plates can meet the requirements of proper weight, performance, and price. Black silicon carbide grain and powder can be raw materials to produce bulletproof armor.
Ceramics of silicon carbide have features as below:
strong oxidation resistance
good wear resistance
high hardness
good thermal stability
high-temperature strength
small coefficient of thermal expansion
high thermal conductivity
thermal shock resistance and chemical corrosion resistance.
Hardness and toughness of black silicon carbide
The hardness of silicon carbide is quite high, reaching 9.2-9.3 Mohs at 20 ℃. It is one of the hardest materials that can cut rubies; The compressive strength is 224MPa, and the bending strength is 15.5MPa; Its thermal conductivity is higher than that of copper, which is 3 times that of Si and 8-10 times that of GaAs. It has high thermal stability and cannot be melted under normal pressure.
The toughness of silicon carbide particles is the strength that silicon carbide particles can bear at specified pressure in a fixed mold. Particle shape and quality level are both factors that influence the toughness of black silicon carbide.
Thermal Properties of black Silicon Carbide
Black silicon carbide is synthesized at high temperatures. So products made from black silicon carbide are suitable for high-temperature applications. If only a rough calculation is made, the average thermal expansion coefficient of silicon carbide can be 4.4 within the range of 25~1400 ℃ × 10-6/℃。 The measurement results of the thermal expansion coefficient of silicon carbide show that its value is much smaller than that of other abrasives and high-temperature materials. For example, the thermal expansion coefficient of corundum can be as high as (7~8) × 10-6/℃。 SiC has a high thermal conductivity, which is another important feature of the physical properties of silicon carbide. Its thermal conductivity is much larger than that of other refractories and abrasives, about 4 times that of corundum. Therefore, the low thermal expansion coefficient and high thermal conductivity of SiC make its products subject