Patent ID: 8808414

Claim:
A Sialon sintered body having a Sialon phase comprising at least a β-Sialon and a 12H-Sialon among an α-Sialon, the β-Sialon and the 12H-Sialon, wherein a ratio of a second Sialon total content to a first Sialon total content is greater than 20% and not greater than 55%, and a ratio of the content of the 12H-Sialon to the first Sialon total content is greater than 5% and not greater than 55%, wherein the first Sialon total content is a sum of contents of the α-Sialon, the β-Sialon and the 12H-Sialon and the second Sialon total content is a sum of the contents of the β-Sialon and the 12H-Sialon, wherein the ratio of the content of the α-Sialon to the first Sialon total content is not less than 0% and not greater than 15%.