PIP法制备SiC纳米线增强SiCf/SiC复合材料及其力学性能  

Effect of SiC Nanowires on Mechanical Properties of PIP-SiC_f/SiC Composites

作　　者：秦浩[1,2] 董绍明[1] 胡建宝[1] 阚艳梅[1] 何平[1] 王洪达[1,2] 

机构地区：[1]中国科学院上海硅酸盐研究所,高性能陶瓷和超微结构国家重点实验室,上海200050 [2]中国科学院大学,北京100049

出　　处：《硅酸盐学报》2016年第10期1532-1537,共6页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金项目(51502323);上海市自然科学基金项目(14ZR1445800);中国科学院上海硅酸盐研究所科技创新项目(Y42ZC6160G)

摘　　要：利用化学气相沉积法原位生长Si C纳米线,制备出Si C纳米线增强Si Cf/Si C复合材料。研究了Si C纳米线及Si C纳米线/基体热解碳界面调控对复合材料的力学性能、裂纹扩展行为、纤维与基体之间的结合强度的作用。研究表明:Si C纳米线的引入能显著提高复合材料的致密化效果。通过调控Si C纳米线/基体的界面厚度,可显著提高复合材料的力学性能。Si C纳米线的引入提高了纤维/基体的界面结合强度,而Si C纳米线表面热解碳的引入可改善纤维/基体的界面结合强度。此外,碳化硅纳米线及其界面调控,能有效优化基体的微区力学行为及断裂模式。Two-dimensional SiCk/SiC composites were prepared via in-situ growth of SiC nanowires on the matrix of SiC fabric by a chemical vapor deposition （CVD）. The effects of SiC nanowires and pyrocarbon （PyC） layer between SiC nanowires and SiC matrix on the mechanical properties of composite, crack propagation behavior, and interfacial bonding strength between the fiber and matrix were investigated. The results show that, the introduction of SiC nanowires can improve the densification significantly, enhance the interracial bonding strength between the fiber and matrix, and modulate the fracture mode of the matrix in brittle area as well. Besides, PyC layer can moderate the interfacial bonding strength and affect the mechanical properties.

关 键 词：复合材料 碳化硅纳米线 界面 力学性能 

分 类 号：TB34[一般工业技术—材料科学与工程]