Preparation and Characterization of TiB2 and CNT Dual-Phases Toughened B4C Ceramic Composites

Abstract

Abstract: B₄C-TiB₂-CNT ceramic composites were fabricated by the liquid silicon infiltration (LSI) sintering at 1 500 ℃ in vacuum. The compositions, morphologies, mechanical properties and toughening mechanism of the fabricated composites were investigated. The results show that the main constituent phases of the composites are B₁₂(C, Si, B)₃, SiC and Si. The additions of TiB₂ and CNT significantly improve the mechanical properties of liquid-phase silicon sintered B₄C ceramics. The flexural strength and fracture toughness of the composite ceramics reach (390±18) MPa and (5.38±0.38) MPa·m^1/2 with TiB₂ and CNT additions of 10% and 0.4% respectively, which are 31% and 53% higher than pure B₄C caremics. The toughening mechanisms of B₄C-TiB₂-CNT ceramic composites are explained by the pullout of plate-like SiC particles and CNT, the particle toughening of TiB₂ and the deflection of cracks.

Key words: boron carbide, liquid silicon infiltration, dual-phases toughened ceramics, TiB₂, CNT, ceramic composite

CLC Number:

TQ174

XU Sen, LIN Wensong, ZHANG Hong, SHI Jianqiang, FANG Ningxiang. Preparation and Characterization of TiB₂ and CNT Dual-Phases Toughened B₄C Ceramic Composites[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2022, 51(4): 716-722.

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Preparation and Characterization of TiB₂ and CNT Dual-Phases Toughened B₄C Ceramic Composites

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