Effect of enforcement content on strength/toughness of laminated SiCW/SiC ceramic composites

被引：0
|
作者：
Xie Y. [1 ,2 ]
Cheng L. [1 ]
Zhang L. [1 ]
机构：
[1] School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an
[2] School of Science, Jilin Institute of Chemical Technology, Jilin
来源：
Fuhe Cailiao Xuebao | / 12卷 / 2854-2859期
关键词：
Ceramic matrix composites; Chemical vapor infiltration; Laminated composites; Mechanical properties; Microstructure;
D O I：
10.13801/j.cnki.fhclxb.20160224.002
中图分类号：
学科分类号：
摘要：
Laminated SiC whisker (SiCW)/SiC ceramic composites were fabricated by tape casting and chemical vapor infiltration (TC-CVI) process and the effect of SiCW content on the mechanical properties and microstructures of laminated ceramic composites was discussed. Strengthening/toughening mechanisms of laminated SiCW/SiC ceramic composites were investigated. The results indicate that TC-CVI process can effectively increase the content of whiskers (40vol%) in composites and reduce the damage to whiskers during fabrication process. Moreover, the fabricated laminated SiCW/SiC ceramic composites have appropriate interface bonding strength of interfacial and interlaminar. When SiCW content increases, both of the density and mechanical properties of the laminated ceramic composites can be significantly improved. The density, flexural strength and fracture toughness of laminated SiCW/SiC ceramic composites with 40vol% whisker are respectively 8.4%, 30.8% and 26.7% higher than those of laminated SiCW/SiC ceramic composites with 25vol% whisker. Interfacial and interlaminar crack deflection, and interfacial crack bridging and whisker pull-out can be observed in the fracture morphologies, which are main toughening mechanisms. Large content of SiCW and appropriate interface bonding strength between interfacial and interlaminar can obviously improve the strength and toughness of laminated SiCW/SiC ceramic composites together. © 2016, BUAA Culture Media Group Ltd. All right reserved.
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页码：2854 / 2859
页数：5
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