Effect of heat treatment on the riveted joints of two-dimensional C/SiC composites
Effect of heat treatment on the riveted joints of two-dimensional C/SiC composites
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DOI：
10.1016/j.compositesb.2017.04.002
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发表时间：
2017-07
影响因子：
13.1
通讯作者：
H. Mei;D. Zhang;Junchao Xia;Lai-fei Cheng
中科院分区：
文献类型：
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作者：
H. Mei;D. Zhang;Junchao Xia;Lai-fei Cheng
提出了一种用化学气相渗透法制备2D C/SiC复合材料的铆接方法，并通过X射线测试、力学性能测试、显微组织分析和工业CT测试，研究了热处理对2D C/SiC复合材料铆接接头的影响。实验结果表明，热处理工艺和铆接工艺的顺序是影响2D C/SiC铆接接头的微观组织、分层缺陷总数、纤维拔出长度和拉伸断裂强度的关键因素。铆接后的热处理工艺可以释放装配应力和残余热应力，减少铆接接头的分层缺陷，而铆接前的热处理工艺会增加分层缺陷，扩大铆接接头的编织孔洞。铆接后再进行热处理，接头的抗拉强度提高了23.2%，而相反的两种工艺，接头的抗拉强度降低了27.1%。
A kind of riveting method for 2D C/SiC composites by chemical vapor infiltration were presented and the effect of heat treatment on the riveted joints of 2D C/SiC has been investigated through X-ray tests, mechanical tests, microstructural characterization and industrial computed tomography tests. The experimental results pointed that the order of heat treatment process and riveting process is a key factor affecting the micro-structures, total numbers of delamination defects, fiber pulling out length and tensile fracture strength of 2D C/SiC riveted joints. The heat treatment process after riveting can release assembly stress and residual thermal stress, and reduce the delamination defects in riveted joints, while the heat treatment process before riveting could increase the delamination defects and enlarge the braided holes in the riveted joints. The tensile strength increased by 23.2% when the riveted joints are riveted followed with heat treatment process, and the tensile strength of riveted joints decreased by 27.1% if the two processes are reversed.