Patent ID: 8889577
Filing Date: 2014-11-18
Classification: B23B,C04B,Y10T

Abstract:
1. A sintered body containing alumina crystal particles and zirconia crystal particles as main components, wherein the zirconia crystal particles include tetragonal crystal particles and satisfy relations 0%≦A≦3%, 3%≦B≦22% and 77%≦C≦96%, wherein N represents a total number of the zirconia crystal particles in a 10 μm square area at any cut plane of the sintered body, A represents a ratio of a number a of first zirconia crystal particles to the total number N of the zirconia crystal particles, wherein each of the first zirconia crystal particles is surrounded by only the zirconia crystal particles, B represents a ratio of a number b of second zirconia crystal particles to the total number N of the zirconia crystal particles, wherein each of the second zirconia crystal particles is surrounded by only the alumina crystal particles, and C represents a ratio of a number c of third zirconia crystal particles to the total number N of the zirconia crystal particles, wherein each of the third zirconia crystal particles is surrounded by both the zirconia crystal particle and the alumina crystal particle, and the number N is equal to or greater than a value 140.