Abstract
SiC–B4C–Al cermets containing 5, 10 and 20wt.% of Al were fabricated by high-energy planetary milling followed by conventional sintering and spark plasma sintering (SPS) techniques separately. The average particle size reduced to ~3μm from an initial size of 45μm after 10h of milling. The as-milled powders were conventionally sintered at 1950°C for 30min under argon atmosphere and SPS was carried out at 1300°C for 5min under 50MPa applied pressure. The formation of Al8B4C7 and AlB12 phases during conventional sintering and SPS were confirmed by X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses. The formation of Al8B4C7 at 700°C and AlB12 at 1000°C was well supported by XRD and differential scanning calorimetry (DSC). The maximum relative density, microhardness and indentation fracture resistance of SiC–B4C–10Al consolidated by SPS are 97%, 23.80GPa and 3.28MPa·m1/2, respectively.
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