... Boron carbide, a black crystal powder, is one of the hardest Man-Made materials, its hardness with Mohs hardness 9.36 and ... is a good replacement of diamond. Boron carbide also possesses the specialty properties of light quality, neutron absorbing, semi-conductivity, ... alloys, jewels, etc. meanwhile, it is main materials for the wear-resisting parts, precise meter-age element, precise spray nozzle ...