Patent ID: 7056850
Filing Date: 2006-06-06
Classification: C04B,F16C

Abstract:
1. A wear resistant member composed of silicon nitride sintered body containing 2–10 mass% of rare earth element in terms of oxide thereof as sintering agent, 2–7 mass % of MgAl 2 O 4 spinel, 1–7 mass % of silicon carbide, and 0.5–5 mass % of at least one element selected from the group consisting of Ti, Zr, Hf, W, Mo, Ta, Nb and Cr in terms of oxide thereof, wherein a porosity of said silicon nitride sintered body is 1 vol. % or less, a three-point bending strength is 900 MPa or more, a fracture toughness is 6.3 MPa·m 1/2 or more, and a maximum width of aggregated segregation existing in grain boundary phase of the silicon nitride sintered body is 5 μm or less.