Mechanical behavior of 2.5D (shallow straight-joint) and 3D four-directional braided SiO_2f/SiO₂ composites

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• 作者：Yong Liu^a ; Jianxun Zhu^a ; ^b ; ^{jianxun_zhu@163.com} ; Zhaofeng Chen^a ; Yun Jiang^b
• 关键词：B. Composites ; B. Microstructure ; C. Mechanical properties ; Fracture behavior
• 刊名：Ceramics International
• 出版年：2012
• 期刊代码：13_02728842
• 类别：ms
• 出版时间：July, 2012
• 卷：38
• 期：5
• 页码：4245-4251
• 文件大小：1757 K

摘要

The effect of two different fiber architectures on the mechanical properties and mechanical behavior of the SiO_2f/SiO₂ composites processed by silicasol-infiltration-sintering has been investigated. The composites were sintered at relatively low temperature (450 掳C). The fiber/matrix interface strength was weak. The characteristics of 2.5D (shallow straight-joint) structure and 3D four-directional braided structure were determined. The tensile strength, flexural strength, shear strength and failure mechanisms of both 2.5D (shallow straight-joint) and 3D four-directional braided SiO_2f/SiO₂ composites were characterized. It was found that the fiber placement in the preform will strongly affect the mechanical property and failure behavior of the composite. The results of the tests and microstructural observations indicated that 3D four-directional braided SiO_2f/SiO₂ composite had better mechanical properties than 2.5D (shallow straight-joint) SiO_2f/SiO₂ composite. 3D four-directional braided SiO_2f/SiO₂ composite exhibited more graceful failure under loading than 2.5D (shallow straight-joint) SiO_2f/SiO₂ composite.