Abstract
A two-step process (milling and then heat treatment) was used for the preparation of α-Si3N4 nanopowder. The influence of the milling time and heat treatment temperature as processing parameters were investigated on the formation of α-Si3N4. Silicon nitride ceramic was produced by spark plasma sintering at 1700°C for 15min, using MgSiN2 additive. The optimum sample was produced in a 30h milling time, heat treatment at 1300°C, and a 22°C/min heating rate conditions. X-ray fluorescence analysis showed that the purity of the final product is above 98%. Nanoindentation hardness and Young’s modulus of the SPS-ed sample were measured as 17±2.0GPa and 290±11.0GPa, respectively.
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