| abstract |
The main component is β-Si3N4 crystal particles, the rare earth element is converted to oxide in an amount of 2 to 4% by mass, Al is converted to an oxide in an amount of 2 to 6% by mass, and Hf is converted to an oxide in an amount of 0.1 to 5%. In the wear-resistant member comprising the silicon nitride sintered body containing the mass%, the silicon nitride sintered body has a rare earth-Hf-O-based compound crystal and per unit area of 30 μm × 30 μm in an arbitrary cross section The area ratio of the rare earth-Hf-O-based compound crystal in the grain boundary phase is 5 to 50%, and the variation in the area ratio of the rare-earth-Hf-O based compound crystal between the unit areas is within 10%. It is characterized by. According to the said structure, the abrasion-resistant member which consists of a silicon nitride sintered compact which is excellent in abrasion resistance and good workability can be provided. |