Kondo H, Sekino T, Choa Y H, Kusunose T, Nakayama T, Wada M, Adachi T, Niihara K
Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan.
J Nanosci Nanotechnol. 2002 Oct;2(5):485-90. doi: 10.1166/153348802760394043.
Effects of Ni dispersions on microstructure and mechanical properties have been studied for Y2O3-stabilized tetragonal zirconia (Y-TZP)/Ni nanocomposites with Ni dispersion up to 10 vol%. Composites were successfully fabricated by reducing and hot-pressing Y-TZP/NiO powder mixtures. Fracture strength was significantly improved from 1.5 GPa for monolithic Y-TZP to 1.9 GPa for nanocomposites with a small addition of Ni (1-2 vol%). Magnetic properties of Y-TZP/Ni nanocomposites were also investigated. Magnetization curves of Y-TZP/Ni nanocomposites showed typical hysteresis loops of soft magnetic materials, whereas coercivity was much larger than that of pure Ni metal. A new function arising from magnetomechanical effects of metallic Ni is also discussed for the present nanocomposites.
对于镍含量高达10体积%的Y2O3稳定四方氧化锆（Y-TZP）/镍纳米复合材料，研究了镍分散对其微观结构和力学性能的影响。通过还原和热压Y-TZP/NiO粉末混合物成功制备了复合材料。断裂强度从单相Y-TZP的1.5 GPa显著提高到添加少量镍（1-2体积%）的纳米复合材料的1.9 GPa。还研究了Y-TZP/镍纳米复合材料的磁性。Y-TZP/镍纳米复合材料的磁化曲线显示出软磁材料典型的磁滞回线，而矫顽力比纯镍金属大得多。还讨论了本纳米复合材料中金属镍的磁机械效应产生的新功能。
