2D C/SiC复合材料细观损伤机制及氧化对其影响的研究
On the mesoscopic damage mechanism of 2D C/SiC composite and effect of oxidation on damage mechanism
Received:November 09, 2016  Revised:February 23, 2017
DOI:10.7520/1001-4888-16-241
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)
Author NameAffiliation
HUANG Peng-fei School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China 
YAO Rui-xia School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China 
WANG Long Beijing Institute of Structure and Environment Engineering, Beijing 100076, China 
LI Teng-hui School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China 
PAN Xiao-xu School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China 
SU Fei School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China 
Hits: 915
Download times: 253
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。随着氧化的发生,得到C/SiC陶瓷基复合材料细观形貌以及破坏机制的变化规律。随着氧化程度的加强,发现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 observe and analyze the mesoscopic damage mechanism of C/SiC ceramic matrix composite, the surface coating was removed first by using dicing cutter, and mesoscopic damage mechanism was studied by scanning electron microscope (SEM) and in-situ loading device. Based on above results and in combination with macroscopic phenomenon, mesoscopic damage mechanism is explained. Based on four-point bending experiment, a self-established high temperature heating system was used to oxidize the material under different high temperature conditions. With the occurrence of oxidation, the mesoscopic morphology and variation of damage mechanism of C/SiC ceramic matrix composite were obtained. With the increase of oxidation degree, it is found that the matrix and fiber of material are ablated at different degrees, the interface layer is destroyed, and the flexural strength is decreased gradually. At the same time, the pull-out of fiber, the mode of crack's initiation and propagation is changed, resulting in the appearance of different fracture surfaces.
View Full Text  Download reader
Close