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2D C/SiC复合材料细观损伤机制及氧化对其影响的研究
Study on meso-mechanism of 2D C/SiC composites and its influence on oxidation
投稿时间: 2016-11-09  最后修改时间: 2017-02-23
DOI:
中文关键词:  2D C /SiC复合材料 细观机制 纤维氧化 裂纹萌生
英文关键词:2D C/SiC composites, mesoscopic mechanism, fiber oxidation, crack initiation
基金项目:国家重点基础研究发展计划(973计划)
作者单位E-mail
黄鹏飞 北京航空航天大学 727660226@qq.com 
苏飞 北京航空航天大学 sufei@buaa.edu.cn 
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中文摘要:
      为了观察分析C/SiC陶瓷基复合材料的细观损伤机制,利用划片切割机去除表面涂层,采用扫描电镜和配套的原位加载装置探究其细观损伤机理,以此结合宏观现象并对其作出解释。本文以四点弯实验为基础,利用搭建的高温加热系统在不同高温环境下氧化材料,得到随着氧化的发生,C/SiC陶瓷基复合材料细观形貌以及破坏机制的变化规律。发现随着氧化程度的加强,材料基体以及纤维出现不同程度的烧蚀,界面层遭到破坏,弯曲强度逐渐降低。同时纤维的拔出、裂纹的萌生以及扩展方式发生了改变,从而导致不同破坏断口的出现。
英文摘要:
      In order to analyze the meso-failure mechanism of C/SiC ceramic matrix composites, the surface coating was removed by using diamond saw and the meso-mechanism was studied by scanning electron microscope(SEM) and in-situ loading device, which was to combine with macroscopic phenomena and explain them. Based on four-point bending experiment, the microstructures of C/SiC ceramic matrix composites and the mechanism of failure mechanism with the occurrence of oxidation were obtained by oxidizing the materials under different high temperature environment with the high temperature heating system. It was found that with the increase of oxidation degree, the matrix and the fiber were ablated to different degrees, the interface layer was destroyed and the bending strength decreased gradually. At the same time, the extraction of the fiber, the initiation of the crack and the way of expansion have changed, leading to the emergence of different damage fracture.
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