发明名称 Insert and cutting tool
摘要 An insert includes a silicon nitride sintered body including beta-Si3N4 as a main component, Mg, and a rare-earth element Re (Y, La, Ce, Er, Dy, Yb). A content of Mg in terms of MgO is 1.0-7.0 mol %, a content of Re in terms of an oxide thereof is 0.4-1.0 mol %, and a total content of Mg and Re is from 1.7 to less than 7.5 mol %. The insert has a graded composition in which oxygen content increases from a surface of the sintered body toward an inside thereof such that 0.8-1.5 mass % of oxygen is contained in a region of less than 0.5 mm inside from the surface, 1.1-2.3 mass % of oxygen is contained in a region of 0.5 mm or more inside from the surface, and a difference in oxygen content between the regions is 0.1-1.0 mass %.
申请公布号 US8492300(B2) 申请公布日期 2013.07.23
申请号 US20080532126 申请日期 2008.03.14
申请人 TOYODA RYOJI;SUZUKI YUSUKE;HATANO YUKI;NGK SPARK PLUG CO., LTD. 发明人 TOYODA RYOJI;SUZUKI YUSUKE;HATANO YUKI
分类号 C04B35/587;C04B35/596 主分类号 C04B35/587
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