A silicon nitride sintered body and its manufacturing method

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PROBLEM TO BE SOLVED : To obtain a sintered compact having slight unevenness in mechanical strength, a cumulative breaking probability of 1/100, 000 and high guaranteed strength and excellent in reliability by incorporating a specified amt. of a specified compd. SOLUTION : This sintered compact contains 0.5-9vol.% FeSi particles of 5-30μm average particle diameter. It is obtd. by compacting a powdery mixture consisting of 1-8wt.% one or more kinds of oxides of rare earth elements, 1-8wt.% Mg(OH)2 , 0.5-10wt.% Fe, 0.1-3wt.% TiSi2 and the balance Si3 N4 with inevitably contained SiO2 and sintering the resultant compact at 1, 550-1, 650 deg.C in an atmosphere contg. gaseous N2 . The Si3 N4 in the mixture is Si3 N4 powder having α- and/or β-crystal structure, preferably fine particles of <=5μm average particle diameter.