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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·m1/2。
Nanocomposite ceramic materials are the closest to the industrialization of nano-ceramic materials, has become an international research hotspot. Adding a second phase of the metal may increase the mechanical and tribological properties of the nanocomposite ceramic material at the same time. Therefore, based on the yttria-stabilized tetragonal zirconia polycrystals (Y-TZP) / Al2O3 nano-ceramic, the method of hot-press sintering is adopted by using the ZrO2-Y2O3-Al2O3 nano-composite powder and the metal Mo powder Y-TZP / Al2O3 / Mo nano-ceramic-metal composites were successfully prepared. The effect of Mo content on the microstructure and mechanical properties of the material was investigated. The results show that the composite structure is mainly composed of three types of intergranular, intragranular and nano-nano hybrids. This kind of structure makes the material have very high fracture toughness. When the mass fraction of Mo is 60% Fracture toughness up to 20.8MPa · m1 / 2.