Densification and sintering technology of boron carbide ceramics
Release time：2021/02/22 Author：
Meiqi
Densification of pure boron carbide sintering is extremely difficult This is because the covalent bond number of 93.94%, higher than that of other structural ceramics, such as SiC (88%), Si3N4 (70%), etc., so that the boron carbide elimination of pores within the grain boundary and volume diffusion and mass transfer mechanism should be carried out in more than 2000 under low temperature, the surface diffusion nuclear evaporation - again condensation reaction is mainly diffusion mechanism, forming the neck respectivelyStomatal gathered and grain round (to reduce specific surface area), or due to gas instead should be particles grow on its own, but the surface of the particles is low can hinder the quite particle rearrangement or shape adjustment, if there were no mechanical or chemical activation, even the submicron powder also cannot reach full densification Therefore, boron carbide sintered must adopt effective additives or pressure sintering.
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