| abstract |
The present invention provides a wear-resistant member made of a silicon nitride sintered body that can be manufactured at low cost and has excellent reliability with suppressed variation in characteristics. In a wear-resistant member made of a silicon nitride sintered body having a sphere having a diameter of 20 mm or more and a volume of 4000 mm 3 or more, the silicon nitride sintered body contains a rare earth element component in terms of a rare earth element. 1-5 mass%, Al element component 1-6 mass% in terms of Al element, Fe element component 10-3500 ppm in terms of Fe element, Ca element component 10-1000 ppm in terms of Ca element, silicon nitride The β conversion ratio of the crystal grains is 95% or more, the maximum major axis of the silicon nitride crystal grains is 40 μm or less, and the variation in the Vickers hardness and fracture toughness value inside the silicon nitride sintered body is within ± 10%. The average aspect ratio of the silicon nitride crystal grains in a unit area of 100 μm × 100 μm obtained by mirror-finishing an arbitrary cross section is 2 or more and 10 or less. It is a wearable member. [Selection] Figure 1 |