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增强体含量对SiC_W/SiC层状陶瓷复合材料强韧性的影响

ISSN号：1000-3851
期刊名称：《复合材料学报》
时间：0
分类：TB332[一般工业技术—材料科学与工程] TQ174[化学工程—陶瓷工业;化学工程—硅酸盐工业]
作者机构：[1]西北工业大学材料学院,西安710072, [2]吉林化工学院理学院,吉林132022
相关基金：国家杰出青年科学基金（51032006）;吉林省教育厅科学研究项目（2015437）;吉林化工学院校级项目（2015053）;吉林化工学院校级博士启动项目（2015129）;吉林化工学院重大科技项目（2015011）

关键词：陶瓷基复合材料, 层状复合材料, 化学气相渗透, 力学性能, 微观结构, ceramic matrix composites, laminated composites, chemical vapor infiltration, mechanical properties, microstructure

中文摘要：

采用流延-化学气相渗透（TC-CVI）工艺制备SiC晶须（SiC_W）/SiC层状陶瓷复合材料,研究了SiC_W含量对层状陶瓷复合材料力学性能和微观结构的影响,探讨了SiC_W/SiC层状陶瓷复合材料的强韧化机制。结果表明：TC-CVI工艺能够有效提高复合材料中晶须含量（40vol%）,减少制备过程对晶须损伤,所制备的SiC_W/SiC层状陶瓷复合材料具有合适的层内及层间界面结合强度。随着SiC_W含量增加,层状陶瓷复合材料的密度和力学性能均有明显提高。含40vol%晶须的SiC_W/SiC层状陶瓷复合材料的密度、弯曲强度和断裂韧性均比含25vol%晶须的分别提高了8.4%、30.8%和26.7%。断口形貌中能够观察到层间及层内的裂纹偏转,层内的裂纹桥接和晶须拔出等,这些为主要的增韧机制。高含量SiC_W及合适的层间和层内界面结合强度,对提高SiC_W/SiC层状陶瓷复合材料强韧性有明显作用。

英文摘要：

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 mech- anisms. 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.

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