Nuclear grade boron carbide (B₄C)
Boron carbide, alias black diamond, is an inorganic substance. The chemical form is B₄C. It is one of the three toughest materials known in the world (after diamond and cubic phase boron nitride). Boron carbide is a black-gray powder with a Mohs hardness of about 9.5, a relative density of 2.52g/cm3, a melting point of 2350℃ and a boiling point of more than 3500℃.
Due to its low density, high strength, high temperature stability and good chemical stability, boron carbide is used in wear-resistant materials, ceramic reinforcement phase, especially in light armor, reactor neutron absorbent and other aspects.
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