| 摘要 |
A SiAlON-based sintered body having a high mechanical strength and fracture toughness, as well as an excellent oxidation resistance, is provided. The SiAlON-based sintered body comprises 5 to 50% by weight of a first crystal phase of RE alpha -SiAlON represented by REx(Si, Al)12(O, N)16, where RE stands for at least one modifying rare earth element selected from the group consisting of Ho, Er, Tm, Yb and Lu and x has a value of 0<x</=2, 30 to 90% by weight of a second crystal phase of beta -SiAlON represented by Si6-zAlzOzN8-z (0<z</=4.2), and 1 to 50% by weight of a third crystal phase containing at least one rare earth element RE selected from the group consisting of Ho, Er, Tm, Yb and Lu, optionally together with 1 to 20% by weight of a crystal phase of alpha -silicon nitride.
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