Abstract
Reaction-bonded boron carbide (RBBC) is prepared through the process that liquid silicon infiltrating into porous B4C/resin preforms. The reaction between B4C and liquid silicon, structural evolution of RBBC composites and factors affecting the mechanical properties were analyzed. The results showed that the independently distributed B4C particles and newly-formed coarse SiC grains surrounded by banded silicon phase were the main reasons for the performance degradation of RBBC composites. On this basis, we studied the effect of B4C on the liquid silicon infiltration and performance enhancement of reaction-bonded silicon carbide (RBSC) composites. It is an effective and easy method to improve the performance of RBSC composites sharply using refined B4C particle as the reinforcement. The main reasons for the performance enhancement are the reduction of the content and dimensions of residual silicon, increase of the fracture energy and grain refinement.
Published Version
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