Boron carbide (B4C) is gray-black and is a very hard artificial material. Its Mohs hardness is 9.3 and its microhardness is 5500~6700kg/mm2, second only to diamond and cubic boron nitride. The crystal structure of boron carbide is hexagonal crystal. Density is 2.52g/cm3. The melting point is 2450°C. When the temperature is higher than 2800°C, it decomposes and volatilizes rapidly. Its linear expansion coefficient is 4.5×10-6/℃ (20~1000℃), its thermal conductivity is 121.42 (100℃) W (m·K), 62.80 (700℃) W/(m·K), and its resistivity It is 0.44 (20℃)Ω·cm and 0.02 (500℃)Ω·cm.
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