Boron carbide - WikipediaBoron carbide is an extremely hard boron–carbon ceramic, and covalent material used in tank . Because of the small size of the B6 octahedra, they cannot interconnect. Instead, they bond to the B12 icosahedra in the neighboring layer, and.boron carbide size,Boron carbide powder, −200 mesh, 98% | Sigma-AldrichSigma-Aldrich offers Aldrich-378100, Boron carbide for your research needs. Find product specific . predominantly β-phase, ≤10micron primary particle size.