PyC界面层厚度对三维针刺C/ZrC-SiC复合材料力学性能影响规律  

Effects of PyC Interface Thickness on The Mechanical Properties of 3D Needled C/ZrC–SiC Composites

作　　者：杨晓辉[1,2] 李克智 白龙腾[1,2] 王毅[2] YANG Xiaohui;LI Kezhi;BAI Longteng;WANG Yi(Northwestern Polytechnical University,Xi’an 710072;Xi’an Aerospace Propulsion Institute,Xi’an 710100)

机构地区：[1]西北工业大学,西安710072 [2]西安航天动力研究所,西安710010

出　　处：《宇航材料工艺》2021年第2期38-46,共9页Aerospace Materials & Technology

基　　金：国家自然科学基金项目(U51521061和51772247);国家“111”计划项目(B08040)。

摘　　要：为提高C/ZrC-SiC复合材料力学性能,优化C/ZrC-SiC复合材料制备工艺,采用化学气相沉积工艺制备了不同PyC界面层厚度试样,系统研究了PyC界面层厚度对三维针刺C/ZrC-SiC复合材料的弯曲、断裂韧性影响规律,并对其作用机理进行简要分析。结果表明,随着沉积时间增加,针刺预制体碳纤维表面PyC界面层从颗粒状结构转化为厚度不断增加的热解碳界面层,C/ZrC-SiC复合材料弯曲力学强度、弯曲模量断裂韧性(KIC)和断裂功(γWOF)均表现出先增大而后降低的变化规律。In order to improve the mechanical properties of C/ZrC-SiC composites and optimize the preparation process of C/ZrC-SiC composites,samples with different PyC interface thickness were prepared by chemical vapor deposition(CVD).The effects of PyC interface thickness on the flexural and fracture properties of C/ZrC-SiC composites were systematically studied,and the mechanisms were briefly analyzed.The results show that with the increase of deposition time,the PyC interface on the surface of needle punched carbon fiber transforms from granular structure to pyrolytic carbon interface layer with increasing thickness.The flexural strength,flexural modulus,fracture toughness(KIC)and work of fracture(γwof)of C/ZrC-SiC composites increase firstly and then decrease.

关 键 词：C/SiC-ZrC 复合材料 界面层 弯曲性能 断裂韧性 断裂功 

分 类 号：V45[一般工业技术—材料科学与工程]