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PROBLEM TO BE SOLVED : To provide a manufacturing method of an α-sialon sintered compact having a high toughness and hardness, and the α-sialon sintered compact. SOLUTION : The α-sialon sintered compact is manufactured by preparing a molded product made of a mixed powder for producing α-sialon corresponding to the formula : Rx(Si, Al)12(O, N)16 (wherein 0.33
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