纳米复相陶瓷材料是目前最接近于产业化的纳米陶瓷材料,已成为国际研究热点。添加金属第二相有可能同时提高纳米复相陶瓷材料的力学和摩擦学性能。为此,在钇稳定多晶氧化锆(yttria-stabilized tetragonal zirconia polycrystals, Y-TZP)/Al2O3纳米陶瓷的基础上,用ZrO2-Y2O3-Al2O3纳米复合粉体和金属Mo粉采用热压烧结的方法成功制备了Y-TZP/Al2O3/Mo纳米陶瓷-金属复合材料。研究了Mo含量对材料显微结构和力学性能的影响。结果表明:复合材料结构主要由晶界型、晶内型和纳米-纳米型3种类型的混合型组成,这种结构使材料具有非常高的断裂韧性,在Mo的质量分数为60%时,断裂韧性可达20.8MPa·m^1/2。
Ceramic nanocomposites are the most promising materials for industrial nano-ceramic material at present, and have become an international research focus. The addition of a metal second phase may improve the tribological and mechanical properties of ceramic nanocomposites. Yttria-stabilized tetragonal zirconia polycrystals (Y-TZP)/Al2O3/Mo nanocomposites were prepared by hot-pressing using nano-sized ZrO2-Y2O3-Al2O3 as the matrix and metal molybdenum with micro-size as a dopant. The effects of Mo content on the microstructure and mechanical property of Y-TZP/Al2O3/Mo ceramic-metal nanocomposites were studied. The results show that the Y-TZP/Al2O3/Mo mixed structures are composed of intra-type, inter-type, and nano/nano type, which make the material have very high flacture toughness. A highest indentation toughness of 20.8 MPa·m^1/2 can be achieved for the Y-TZP/Al2O3/Mo nanocomposite with an Mo mass fraction of 60%.