Abstract
Silicon nitride(Si₃N₄) is one of the most widely used structural ceramic materials. However silicon nitride is difficult to sinter because of its strong covalent bonding characteristics. In this study, Si₃N₄ ceramics were fabricated by spark plasma sintering process with Y₂O₃ and Al₂O₃ addition to improve the sinterability and the mechanical properties and their phase transformation behavior, microstructure and mechanical properties were evaluated. Fully densified Si₃N₄ ceramics could be obtained by spark plasma sintering process at a lower temperature than conventional sintering method. The formation of network microstructure was affected by the addition of Al₂O₃ because it could accelerate α to β phase transformation of Si₃N₄. As a result, the mechanical properties depended on amounts of Al₂O₃ addition. The hardness value increased with increasing α-phase fraction, but fracture toughness value increase with increasing β-phase fraction.
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