SILICON NITRIDE SINTERED COMPACT

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PROBLEM TO BE SOLVED : To provide a silicon nitride sintered compact having high wear resistance and improved chipping-off resistance. SOLUTION : In the silicon nitride sintered compact, a surface region where the content of RE element (where, RE is at least one of yttrium or rare earth element) is constant within 5% to the content of that in the inside of the silicon nitride sintered compact, and the content of the magnesium element is less than 5% to the content of that of the inside of the silicon nitride sintered compact, exists in the surface of the silicon nitride sintered compact containing silicon nitride as main body, an RE element compound and a magnesium compound. COPYRIGHT : (C)2010, JPO&INPIT