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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials >Mechanical properties and microstructure of carbon fibre reinforced carbon materials produced by chemical vapour infiltration
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Mechanical properties and microstructure of carbon fibre reinforced carbon materials produced by chemical vapour infiltration

机译：化学气相渗透法制备碳纤维增强碳材料的力学性能和微观结构

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摘要

Correlations between mechanical properties, fibre architecture, matrix texture and fracture behaviour of carbon fibre reinforced carbon CFC-materials produced by chemical vapour infiltration are investigated using results from tensile and four-point-bending tests, polarized light microscopy and scanning electron microscopy. Mechanical testing was performed at temperatures from 20 up to 1600℃. Samples were tested in the as-received state and after heat treatment at T = 2200℃. The heat treatment leads to an increasing Young's modulus and brittleness, which corresponds with an increasingly distinct layer structure of high textured matrix carbon. A rise of test temperature up to 1400℃ also leads to a larger Young's modulus and increasing brittleness. However, at T = 1600℃ the material shows a pronounced pseudoductile behaviour. Scanning electron micrographs show in this case a lot of concentric cracks between the sublayers of the high textured matrix. The fracture behaviour is explained by a multiple delamination between these layers.
机译：利用拉伸和四点弯曲试验，偏光显微镜和扫描电子显微镜的结果，研究了化学气相渗透生产的碳纤维增强碳CFC材料的力学性能，纤维结构，基体织构与断裂行为之间的相关性。机械测试是在20至1600℃的温度下进行的。在接收状态下以及在T = 2200℃热处理后对样品进行测试。热处理导致杨氏模量和脆性增加，这与高织构基体碳的越来越明显的层结构相对应。测试温度升高到1400℃也会导致更大的杨氏模量和增加的脆性。然而，在T = 1600℃时，材料显示出明显的假延性行为。扫描电子显微镜照片显示，在这种情况下，高织构基质的子层之间存在许多同心裂纹。这些层之间的多次分层解释了断裂行为。

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