Preparation of TiB2-SiC composites toughened with interlocking microstructure by self-assembled TiB2 plates
CERAMICS INTERNATIONAL(2022)
摘要
The spark plasma sintering (SPS) technique was found to effectively improve the mechanical properties of TiB2-SiC ceramic by forming a unique interlocking structure. This study investigated the phase transition process of the hexagonal micro-platelets TiB2 powders with self-assembled structure during the molten-salt-mediated carbothermal reduction and its effect on promoting the mechanical properties of TiB2-based ceramics. It was found that the SPS approach ensured a highly densified TiB2-SiC ceramics with enhanced Vickers hardness of 21.0 +/- 1.3 GPa and fracture resistance of 7.8 +/- 0.3 MPa m(1/2). The performance enhancement of the resultant TiB2-SiC composite was attributed to the interlocking structure from the original anisotropic TiB2 powders, which could effectively absorb the energy and facilitate the crack deflection.
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关键词
Ultra-high temperature ceramics,Interlocking structure,Fracture resistance
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