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首页> 外文会议>Ceramic microstructures : Control at the atomic level >NANO-SIZED OXIDE COMPOSITE POWDERS, BULK MATERIALS AND SUPERPLASTIC BEHAVIOR AT ROOM TEMPERATURE
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NANO-SIZED OXIDE COMPOSITE POWDERS, BULK MATERIALS AND SUPERPLASTIC BEHAVIOR AT ROOM TEMPERATURE

机译：室温下的纳米氧化物复合粉末，块状材料和超塑性行为

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摘要

The preparation and characterization of nano-sized zirconia and its composite powders, Y-TZP/Al_2O_3 by various chemical processes is presented. Different ways to avoid hard-agglomerate formation and the characterization of the powders are discussed. Satisfactory green compact formation and full densification can be achieved at far lower temperatures in comparison with micron sized powder. The incorporation of alumina into Y-TZP nano-powders showed the effect of further lowering the grain size and the enhancement of sinterability as well as the strengthening and toughening of the nano-nano composites. Room temperature tensile fatigue studies on the fully dense nanostructured specimens were pursued. It was first observed that localized superplastic deformation of the grains at and near the fatigue fracture surfaces, was generated by fatigue. Grain boundary diffusion is reasoned to be the major governing micromechanism in operation.
机译：提出了通过各种化学方法制备和表征纳米氧化锆及其复合粉Y-TZP / Al_2O_3的方法。讨论了避免硬团聚体形成和粉末表征的不同方法。与微米级粉末相比，在低得多的温度下可以实现令人满意的生坯成形和完全致密化。 Y-TZP纳米粉中掺入氧化铝显示出进一步降低晶粒尺寸和增强烧结性以及增强纳米纳米复合材料的效果。进行了对全密度纳米结构试样的室温拉伸疲劳研究。首先观察到，疲劳造成了晶粒在疲劳断裂表面及其附近的局部超塑性变形。晶界扩散被认为是操作中的主要控制微观机制。

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