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首页> 外文期刊>Materials Research Innovations >Effects Of Fine Alumina Dispersion On Ionic Conductivity And Mechanical Properties Of Ytterbia Stabilized Cubic Zirconia
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Effects Of Fine Alumina Dispersion On Ionic Conductivity And Mechanical Properties Of Ytterbia Stabilized Cubic Zirconia

机译：氧化铝细分散体对离子稳定的立方氧化锆离子电导率和力学性能的影响

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摘要

Nanocomposites of Yb_2O_3 stabilized ZrO_2 (YbSZ) containing fine Al_2O_3 dispersions were fabricated by conventional powder mixing and a pressureless sintering technique. A fine homogeneous microstructure was obtained for the composites. This microstructural refinement decreased the size of defects in the composites, which significantly increased the fracture strength of the composites compared to that of monolithic ZrO_2. The composites had the same ionic conductivity values as those of the monolithic ceramics at high temperatures (in the range of 800 ― 1000 ℃). Furthermore, the activation energy at high temperatures was independent of the Al_2O_3 content, whereas in the lower temperature regime (300―800 ℃), it varied with the Al_2O_3 fraction. This indicated that different O~(2-) conduction-based activation processes were operating in the two temperature regimes. The O~(2-) ion transfer could easily occur at high temperatures due to the presence of the Al_2O_3 particulate dispersion in the composite system. From these results, it was concluded that the dispersion of fine grained Al_2O_3 into YbSZ is advantageous for achieving high-strength ion-conductive cubic zirconia.
机译：通过常规粉末混合和无压烧结技术制备了含有细Al_2O_3分散体的Yb_2O_3稳定的ZrO_2（YbSZ）纳米复合材料。复合材料获得了良好的均匀微观结构。这种微结构的细化减小了复合材料中缺陷的尺寸，与整体的ZrO_2相比，复合材料的断裂强度显着提高。复合材料在高温下（在800〜1000℃范围内）具有与单片陶瓷相同的离子电导率值。此外，高温下的活化能与Al_2O_3的含量无关，而在较低的温度范围（300-800℃）下，活化能随Al_2O_3的分数而变化。这表明在两种温度范围内，不同的基于O〜（2-）传导的活化过程都在起作用。由于在复合体系中存在Al_2O_3微粒分散体，高温下很容易发生O〜（2-）离子转移。从这些结果可以得出结论，将细颗粒的Al_2O_3分散到YbSZ中有利于获得高强度的离子传导性立方氧化锆。

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