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实验以Raman光谱、原位纳米力学测试、偏光显微镜和扫描电镜(SEM)对碳/碳复合材料不同微区的结构和性能进行研究,实验结果表明:碳/碳复合材料不同微区的结构和性能存在明显的差异性,不同微区的石墨化程度是沿着相邻纤维中心径向逐步增强,至纤维间的碳基体最高;碳基体以片层状结构沿纤维表面取向,呈同心圆环状,其光学各向异性远高于纤维内部结构。利用微纳米力学原位测试技术得到纤维表面的摩擦系数远低于基体的摩擦系数。
The structure and properties of different domains of carbon / carbon composites were studied by Raman spectroscopy, in-situ nanomechanical tests, polarized light microscopy and scanning electron microscopy (SEM). The experimental results show that the structures and properties of different domains of carbon / carbon composites The graphitization degree of different micro-regions is gradually increased along the radial direction of the adjacent fiber centers to reach the highest carbon matrix among the fibers. The carbon matrix has a lamellar structure oriented along the fiber surface in the form of concentric rings Its optical anisotropy is much higher than the internal structure of the fiber. The micro-nano mechanical in-situ testing technology is used to obtain the friction coefficient of the fiber surface is much lower than the friction coefficient of the substrate.