A reaction‐bonding process, which offers low sintering shrinkage and is a low‐cost process, was applied to fabricate Y–α‐SiAlON ceramics. The green compacts composed of Si, Y2O3, Al2O3, and AlN were nitrided and subsequently postsintered. Dense single‐phase Y–α‐SiAlON with elongated grain morphology could be achieved in the specimen postsintered at 1900°C. The material exhibited high hardness (1850 HV10) and high fracture toughness (5.1 MPa·m1/2).
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