低温反应熔渗制备C/C-SiC复合材料的微观结构和力学性能  

Microstructure and Mechanical Properties of C/C-SiC Materials Fabricated by Low-Temperature Reactive Melt Infiltration

作　　者：张莹 王雅雷[1] 叶志勇 熊翔[1] 陈招科 孙威 曾毅 ZHANG Ying;WANG Yalei;YE Zhiyong;XIONG Xiang;CHEN Zhaoke;SUN Wei;ZENG Yi(Powder Metallurgy Research Insititute,Central South University,Changsha 410083,China)

机构地区：[1]中南大学粉末冶金研究院,长沙410083

出　　处：《应用技术学报》2018年第4期317-323,共7页Journal of Technology

基　　金：国家自然科学基金项目(51602351)资助

摘　　要：分别在1 450,1 500和1 550℃通过反应熔渗的方法制备了C/C-SiC复合材料,研究熔渗温度对C/C-SiC的性能影响。借助扫描电子显微镜,X射线衍射仪等对C/C复合材料及C/C-SiC复合材料的微观结构等进行表征,测试了C/C-SiC复合材料的弯曲性能。结果表明:熔渗温度不同影响C/C-SiC的密度、孔隙率、残余硅含量及弯曲强度。熔渗温度越高,C/C-SiC的密度越大,孔隙率越低,SiC含量越高,残余硅含量越少,弯曲强度越高。1 550℃反应熔渗制备的C/C-SiC1 550弯曲强度达到136MPa,比C/C-SiC1 450强度高出42%。C/C-SiC复合材料均表现出"假塑性"断裂行为,弯曲断裂过程中无纬布层中的碳纤维拔出明显。C/C-SiC materials were fabricated by reactive melt infiltration(RMI)at three different temperatures of 1450,1500 and 1550℃to investigate the effects of the RMI temperature on the properties of C/C-SiC.Using scan electronic microscope,X-ray diffraction,etc.is to characterized the microstructures and phase compositions of C/C and C/C-SiC composites.The flexural strengths of C/CSiC composites were also tested.The results showed that:The higher RMI temperature was more likely to result in the higher density,lower porosity,more SiC,less residual Si and higher flexural strength of C/CSiC.The flexural strength of C/C-SiC1550 which was prepared at 1550℃ was 136MPa,42%higher than C/C-SiC1450’s.The fracture behavior of all C/C-SiC showed‘pseudo-plastic’manners,in which many carbon fibers of non-woven cloth pulling out were significantly demonstrated.

关 键 词：低温反应熔渗 C/C-SIC复合材料 微观结构 弯曲强度 假塑性 

分 类 号：TB332[一般工业技术—材料科学与工程]