| 摘要 |
<p>A silicon nitride-silicon carbide composite sintered material which comprises 100 parts by weight of a silicon nitride component containing 92 to 99.5 mol% of silicon nitride including excessive oxygen and 0.5 to 8 mol% of the elements of Group IIIa (Y2O3, Sc2O3, Ev2O3, Yb2O3, Ho2O3, Dy2O3, etc.) in the Periodic Table as corresponding oxides thereof and 1 to 100 parts by weight of a silicon carbide component in a dispersed state, wherein the silicon nitride component has an average particle size of 1 mu m or less and an average aspect ratio of 2 to 10, and the silicon carbide component has an average particle size of 1 mu m or less, moreover, the total amount of Al, Mg, Ca respectively contained in the sintered material as calculated as oxides thereof is 0.5% by weight or less, and a manufacturing method thereof. According to the above-mentioned composite sintered material, it becomes possible to suppress deterioration of strength at 1400 DEG C and realize excellent creep properties. Therefore, the composite sintered material is applicable not only to structural materials for heat engines such as gas turbines and turbo-rotors but also to other heat resistant materials for various uses.</p> |
