Abstract
AbstractA novel kind of 3D interconnected porous carbon‐bonded B4C preform with flexural strength of about 20MPa is fabricated by gel‐casting method. As the control, the B4C/C preforms via molding‐produced method are fabricated. The B4C/C preforms own the same carbon content and almost the same porosity with different molding method. Compared with the conventional compression molding‐produced B4C/C preform, the 3D‐interconnected porous carbon‐bonded boron carbide preforms afford three‐fold advantages in the fabrication of reaction‐bonded boron carbide (RBBC) composite via the liquid silicon infiltration (LSI) process, including induced formation of continuous SiC‐bonded boron carbide skeleton structure, a reduction in the size of residual silicon, and prevented the coarsening of ceramic grains as well. As a result, the RBBC composite fabricated by gel‐casting appears as a more refined structure resulting in enhanced mechanical properties: the Vickers hardness, flexural strength, and fracture toughness of I‐GC composites fabricated from 3D‐interconnected porous carbon/B4C preforms are 19.4 ± 1.3 GPa, 389 ± 17 MPa, and 4.37 ± 0.1 MPa·m1/2, respectively, which are statistically higher than those of RBBC fabricated by the conventional compression molding‐produced B4C/C preform.
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