Preparation and Characterization of Reaction Sintering B₄C/SiC Composite Ceramic

Abstract:

High hardness, high strength, high fracture toughness and low density are required for novel bulletproof materials. B₄C/SiC composite ceramic is one of the most potential candidates. In this study, B₄C/SiC composite ceramic was prepared by reaction sintering. The influence of B₄C content, species and content of carbon, sintering temperature on the mechanical properties of B₄C/SiC composite ceramic were studied. A high performance B₄C/SiC composite ceramic was sintered at 1750°C for 30 min. Phenolic resin and carbon black were both chosen as carbon sources, whose favorable contents were 10wt%, 5wt%, respectively. The density of sintered bodies reduces with B₄C content increases. To some extent, fracture toughness, bending strength improve initially and then deteriorate with the increase of B₄C content whose optimal amount is 30wt%. The optimal fracture toughness and bending strength of the B₄C/SiC composite ceramic are 5.07MPa·m^1/2 and 487MPa, respectively. Meanwhile, the Viker-hardness of the sintered body is 30.2GPa, the density is as low as 2.82g/cm³.

• Periodical: Key Engineering Materials (Volumes 602-603)
• Pages: 536-539
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.602-603.536
• Online since: March 2014
• Authors: Hai Bin Sun, Yu Jun Zhang*, Qi Song Li
• Keywords: B₄C/SiC, Mechanical Property, Reaction Sintering

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