| abstract |
A ceramic sintered body which contains aluminum oxide, tungsten carbide and zirconium oxide, and wherein: the zirconium oxide contains ZrO and ZrO 2 ; the ZrO 2 has one or two crystal structures selected from the group consisting of a tetragonal system and a cubic system; and if I 1 is the peak intensity of the (111) plane of the ZrO, I 2t is the peak intensity of the (101) plane of a ZrO 2 having a tetragonal crystal structure and I 2c is the peak intensity of the (111) plane of a ZrO 2 having a cubic crystal structure in the X-ray diffraction, the ratio of I 1 to the total of I 1 , I 2t and I 2c , namely I 1 /(I 1 + I 2t + I 2c ) is from 0.05 to 0.90 (inclusive). |