先驱体浸渍裂解结合化学气相渗透工艺下二维半和三维织构SiC/SiC复合材料的结构与性能  

SiC/SiC Composites Produced by the Combinational Process of Polymer Impregnation & Pyrolysis and Chemical Vapor Infiltration:a Comparative Microstructure and Properties Study upon 2.5D and 3D Braiding Structures

作　　者：赵爽[1] 杨自春[1] 周新贵[2] ZHAO Shuang;YANG Zichu;ZHOU Xingui(Institution of High-temperature Structural Composites for Ship,Naval University of Engineering,Wuhan 430033;Science and Technology on Advanced Ceramic Fibers and Composites Laboratory,National University of Defense Technology,Changsha 410073)

机构地区：[1]海军工程大学舰船高温结构复合材料研究室,武汉430033 [2]国防科技大学新型陶瓷纤维及其复合材料国家重点实验室,长沙410073

出　　处：《材料导报》2018年第16期2715-2718,共4页Materials Reports

基　　金：国家自然科学基金(51372274);海军工程大学科研发展基金(20160135;425317K153)

摘　　要：通过先驱体浸渍裂解工艺结合化学气相渗透工艺(PIP+CVI)制备了二维半(2.5D)和三维(3D)编织结构的碳化硅纤维增强碳化硅基(SiC/SiC)复合材料,对两者的密度、热导率、力学性能以及微观结构等进行了测试分析。结果表明,PIP+CVI工艺制备的SiC/SiC复合材料具有较低的密度(1.98~2.43g·cm-3)和热导率(0.85~2.08 W·m^(-1)·K^(-1)),初期CVI纤维涂层能够提高纤维-基体界面剪切强度(~141.0 MPa),从而提高SiC/SiC复合材料的力学性能,后期CVI整体涂层明显提高了2.5DSiC/SiC复合材料的密度、热导率和力学性能,对3DSiC/SiC复合材料性能的影响不明显。By applying the combinational process of polymer impregnation&pyrolysis and chemical vapor infiltration(PIP+CVI),the present work successfully carried out the fabrication of a 2.5 dimensional and a 3 dimensional SiC/SiC composite,as well as the porosity,thermal conductivity,mechanical property and microstructure characterization and analyses for the products.The low density(1.98-2.43 g·cm^-3)and low thermal conductivity(0.85-2.08 W·m-1·K-1)of the PIP+CVI 2.5D and 3D SiC/SiC composites could be confirmed from the experiment.And moreover,it can be deduced that the pre-weave CVI fiber coating improves the fiber-matrix interface shear strength and hence the resultant composite’s mechanical properties,while the effectiveness of post-pyrolysis overall CVI coating toward the density,thermal conductivity and mechanical properties promotion is notable for the 2.5D SiC/SiC composite but inconspicuous for the 3D one.

关 键 词：先驱体浸渍裂解(PIP) 化学气相渗透(CVI) 编织结构 碳化硅纤维增强碳化硅基(SiC/SiC)复合材料 致密度 热导率 力学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]