Effect of Al addition on SiC-B4C cermet prepared by pressureless sintering and spark plasma sintering
methods, P. Sahani, S. K. Karak, B. Mishra, D. Chakravarty and D. Chaira, Department of Metallurgical and Materials engineering
iC-B4C–Al cermets containing 5, 10 and 20 wt. % 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 30 min under argon atmosphere and SPS was carried out at 1300 C for 5 minutes under 50 MPa 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) analysis. 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 %, 23.80 GPa and 3.28 MPa.m1/2, respectively. More in Int.
Journal of Refractory Metals and Hard Materials 57 (2016) 31–41(Elsevier).
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