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首页> 外文期刊>Ceramic Engineering and Science Proceedings >OPTIMIZATION OF AN INTERPHASE THICKNESS IN HOT-PRESSED SiC_f/SiC COMPOSITES
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OPTIMIZATION OF AN INTERPHASE THICKNESS IN HOT-PRESSED SiC_f/SiC COMPOSITES

机译：热压SiC_f / SiC复合材料的相间厚度优化

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摘要

The effects of the thickness of PyC interphase on the properties of hot-pressed SiC_f/SiC composites were investigated. Slurries of SiC nano-powders containing Al_2O_3/Y_2O_3/MgO sintering additives were infiltrated into the SiC fiber preform with various PyC thicknesses of 200-1000 nm. Densification behavior, microstructural evolution, and mechanical properties of the hot-pressed composites were evaluated. The hot-pressed composite revealed an optimum interphase thickness which was larger than the CVI composite. Density of the hot-pressed composites decreased as the PyC thickness increased. Decrease of the density with the PyC thickness was attributed to the limitation of the slurry infiltration within the SiC fiber bundles. The SiC_f/SiC composites with the PyC thicknesses of 200 and 400 nm showed brittle fracture behaviors due to the elimination of the PyC interphase by the reaction between the oxide phases and PyC during fabrication. However, the composites with the PyC coating of more than 600 nm exhibited pseudo-ductile fracture behaviors with higher strengths.
机译：研究了PyC界面厚度对热压SiC_f / SiC复合材料性能的影响。将含有Al_2O_3 / Y_2O_3 / MgO烧结添加剂的SiC纳米粉浆浸入具有200-1000 nm各种PyC厚度的SiC纤维预成型坯中。评价了热压复合材料的致密化行为，微观结构演变和力学性能。热压复合材料的最佳相间厚度大于CVI复合材料。随着PyC厚度的增加，热压复合材料的密度降低。随着PyC厚度的增加，密度的降低归因于SiC纤维束内浆料渗透的限制。 PyC厚度为200和400 nm的SiC_f / SiC复合材料表现出脆性断裂行为，这是由于在制造过程中通过氧化物相和PyC之间的反应消除了PyC间相。然而，具有超过600 nm的PyC涂层的复合材料表现出具有更高强度的拟延性断裂行为。

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