Abstract
MAX phase Ti3AlC2 was chosen as a novel sintering aid to prepare electrically conductive B4C composites with high strength and toughness. Dense B4C composites can be obtained at a hot-pressing temperature as low as 1850°C with 15vol% Ti3AlC2. The enhanced sinterability was mainly ascribed to the in situ reactions between B4C and Ti3AlC2 as well as the liquid phase decomposed from Ti3AlC2. Both the Vickers hardness and fracture toughness increase with increasing Ti3AlC2 amount, and high hardness and toughness values of 28.5GPa and 7.02MPam−1/2 respectively were achieved for B4C composites sintered with 20vol% Ti3AlC2 at 1900°C. Crack deflection by homogenously distributed TiB2 particles was identified as the main toughening mechanism. Besides, B4C composites sintered with Ti3AlC2 show significantly improved electrical conductivity due to the percolation of highly conductive TiB2 phase, which could enhance the machinability of B4C composites largely by allowing electrical discharge machining.
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