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首页> 外文期刊>European Chemical Bulletin >MICROSTRUCTURE AND SINTERING MECHANISM OF SiC CERAMICS REINFORCED WITH NANOSIZED ZrO2
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MICROSTRUCTURE AND SINTERING MECHANISM OF SiC CERAMICS REINFORCED WITH NANOSIZED ZrO2

机译：纳米ZrO2增强SiC陶瓷的微观结构和烧结机理

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摘要

Silicon carbide-based (SiC) ceramics has attracted quite broad attention due to their excellent mechanical, chemical and thermal properties. However, their widespread industrial application is hindered by difficulties in sintering and poor fracture toughness of sintered bodies. In this work, we present an alternative way to produce SiC-based ceramics with improved microstructure and mechanical properties. We incorporated ZrO 2 nanofibres into the ceramic matrix to achieve a combined reinforcing effect of partially stabilized zirconia, namely fibre and phase transformation strengthening. For comparison, we also prepared silicon carbide ceramics containing yttria stabilized zirconia (YSZ) particles. SiC-based green bodies containing 5 wt%, 10 wt% and 15 wt% ZrO 2 nanofibres and particles, respectively, were subjected to spark plasma sintering (SPS) at relatively low (1700°C) temperatures with high heating and cooling rates. The effects of nanofibres on mechanical properties were studied by determining the Vickers hardness and Young’s modulus of sintered ceramics from instrumented indentation tests. The microstructural patterns were investigated, as well.
机译：碳化硅基（SiC）陶瓷因其出色的机械，化学和热性能而受到了广泛的关注。然而，它们的广泛的工业应用受到烧结困难和烧结体的断裂韧性差的阻碍。在这项工作中，我们提出了一种替代的方法来生产具有改善的微观结构和机械性能的SiC基陶瓷。我们将ZrO 2纳米纤维掺入陶瓷基体中，以实现部分稳定的氧化锆的联合强化作用，即纤维和相变强化。为了进行比较，我们还制备了含有氧化钇稳定的氧化锆（YSZ）颗粒的碳化硅陶瓷。分别包含5 wt％，10 wt％和15 wt％ZrO 2纳米纤维和颗粒的SiC基生坯在较低的温度（1700°C）下以较高的加热和冷却速率进行火花等离子体烧结（SPS）。通过用仪器的压痕测试确定烧结陶瓷的维氏硬度和杨氏模量，研究了纳米纤维对机械性能的影响。还研究了微观结构模式。

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