SIALON SINTERED BODY AND CUTTING INSERT

摘要

A sialon sintered body includes a β-sialon (Si6-ZAlZOZN8-Z) and at least one polytype sialon, wherein a Z value is 0.4 or greater and 1.0 or less, a proportion of a total of peak intensities of each polytype sialon to a total of peak intensities of each sialon, is 10% or greater and 50% or less, at least one rare earth element B selected from a group consisting of La and Ce and at least one rare earth element C selected from a group consisting of Y, Nd, Sm, Eu, Gd, Dy, Er, Yb, and Lu is included, a molar ratio of the rare earth element B and the rare earth element C is 1.0:0.06 to 1.0:3.5 in terms of an oxide, and a total content of the rare earth elements B and C is 0.8 mol % or greater and 4.0 mol % or less in terms of an oxide.

主权项

1. A sialon sintered body comprising:
a β-sialon; and at least one polytype sialon selected from a group consisting of a 12H-sialon, a 15R-sialon, and a 21R-sialon, characterized in that: a Z value of the β-sialon expressed by Si6-ZAlZOZN8-Z is 0.4 or greater and 1.0 or less, a proportion [(IP/IA)×100] of a total IP of peak intensities of each polytype sialon calculated from the peak intensities of the polytype sialons to a total IA of peak intensities of each sialon calculated from the peak intensities of the sialons, which is obtained by X-ray diffraction analysis, is 10% or greater and 50% or less, the sialon sintered body includes at least one rare earth element B selected from a group consisting of La and Ce, and at least one rare earth element C selected from a group consisting of Y, Nd, Sm, Eu, Gd, Dy, Er, Yb, and Lu, a molar ratio MB:MC of the rare earth element B and the rare earth element C is 1.0:0.06 to 1.0:3.5 in terms of an oxide, and a total content of the rare earth element B and the rare earth element C in the sialon sintered body is 0.8 mol % or greater and 4.0 mol % or less in terms of an oxide.