Provided is a ceramic sintered body having high wear resistance and chipping resistance. Also provided are an insert, a cutting tool and a friction stir welding tool, each of which uses such a high-performance ceramic sintered body. The ceramic sintered body includes Al2O3 (alumina), WC (tungsten carbide) and ZrO2 (zirconia), wherein Zr (zirconium) element is present at either one or both of: (1) a grain boundary between crystal grains of the Al2O3; and (2) a grain boundary of crystal grains of the Al2O and crystal grains of the WC, wherein the ceramic sintered body contains 55.0 to 97.5 vol % of the WC, 0.1 to 18.0 vol % of the ZrO2, and the balance being the Al2O3, and wherein the ZrO2 is in a phase of tetragonal structure (T) or a mixed phase of tetragonal structure (T) and monoclinic structure (M).
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机译：提供具有高耐磨性和耐崩裂性的陶瓷烧结体。还提供了刀片，切削工具和搅拌摩擦焊接工具，它们均使用这种高性能陶瓷烧结体。陶瓷烧结体包括Al 2 O 3 （氧化铝），WC（碳化钨）和ZrO 2 （氧化锆），其中Zr（锆） ）元素存在于以下之一或两者中：（1）Al 2 O 3 的晶粒之间的晶界; （2）Al 2 O的晶粒和WC的晶粒的晶界，其中，陶瓷烧结体包含55.0〜97.5vol％的WC，0.1〜18.0vol％的WC。 ZrO 2 ，其余为Al 2 O 3 ，其中ZrO 2 四方结构（T）的四相或四方结构（T）和单斜结构的混合相（M）。
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