Abstract:Single additives (Y 2 O 3 , MgO, and Al 2 O 3 ) were used as sintering aid of Si 3 N 4 . The density, crystal phase, microstructure, transmittance, hardness, and fracture toughness of sintered Si 3 N 4 were investigated. Highly densified sintered bodies were obtained in single Y 2 O 3 and MgO systems, but not in single Al 2 O 3 system. The XRD results indicated that sintered bodies were composed of b-Si 3 N 4 . The SEM images showed that all the sintered bodies had a fine-grained microstructure with an average… Show more
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