Abstract
In this study, boron carbide-metallic boride (B 4 C-MeB x , Me = Ti, Zr, Nb, Ta, or W) multiphase ceramics were fabricated via in situ pressureless sintering at 2250 °C for 1 h. The effects of transition metal carbides, namely, TiC, ZrC, NbC, TaC, and WC, on the phase composition, microstructure, and mechanical properties of the ceramics were investigated. The results showed that MeC could facilitate the sintering densification of B 4 C by distributing second-phase particles uniformly throughout the B 4 C. Additionally, the main phases observed were B 4 C and (Me, W)B x (Me = Ti, Zr, Nb, or Ta) due to the doping of a small amount of WC during the ball milling process. As a result, the mechanical properties of B 4 C-MeB x showed significant improvements when compared with those of single-phase B 4 C ceramics. B 4 C–NbB 2 ceramics were found to exhibit the best mechanical properties, with an elastic modulus of 393.0 GPa, a hardness of 28.7 GPa, a flexural strength of 368.0 MPa, and a fracture toughness of 6.94 MPa m 1/2 .
Published Version
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