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首页> 外文期刊>CERAMICS INTERNATIONAL >Effect of sintering additives on microstructures and mechanical properties of short-carbon-fiber-reinforced SiC composites prepared by precursor pyrolysis-hot pressing
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Effect of sintering additives on microstructures and mechanical properties of short-carbon-fiber-reinforced SiC composites prepared by precursor pyrolysis-hot pressing

机译：烧结助剂对前驱热解-热压法制备短碳纤维增强SiC复合材料的组织和力学性能的影响

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摘要

Short-carbon-fiber-reinforced SiC composites were prepared by precursor pyrolysis-hot pressing with MgO-Al_2O_3-Y_2O_3 as sintering additives. The effects of the amount of sintering additives on microstructure and mechanical properties of the composites were investigated. The results showed that the composites could be densified at a relatively low temperature of 1800 deg C via the liquid-phase sintering mechanism and the composite density and mechanical properties improved with the amount of additives. The amorphous interphase in the composites with more additive content, not only avoided the direct contact of the fibers with matrix, but also improved the fiber-matrix bonding. It proved that the fiber-matrix interphase characteristics played a key role in controlling mechanical properties of the composites.
机译：以MgO-Al_2O_3-Y_2O_3为烧结助剂，通过前驱体热压法制备了短碳纤维增强SiC复合材料。研究了烧结助剂用量对复合材料显微组织和力学性能的影响。结果表明，通过液相烧结机理，可以在1800℃较低的温度下对复合材料进行致密化，并通过添加添加剂提高复合材料的密度和力学性能。具有更多添加剂含量的复合材料中的无定形中间相，不仅避免了纤维与基质的直接接触，而且还改善了纤维与基质的结合。证明了纤维-基体的相间特性在控制复合材料的力学性能中起着关键作用。

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