界面层对近化学计量比碳化硅纤维增强碳化硅复合材料性能的影响  

Effect of Interfacial Layer on the Properties of Near-Stoichiometric Ratio SiC Fiber Reinforced SiC Composites

作　　者：陈明伟 罗文东 邱海鹏 马新 张冰玉 刘善华 Chen Mingwei;Luo Wendong;Qiu Haipeng;Ma Xin;Zhang Bingyu;Liu Shanhua(AVIC Manufacturing Technology Institute,Beijing 100130,China)

机构地区：[1]中国航空制造技术研究院,北京100130

出　　处：《稀有金属材料与工程》2022年第2期645-650,共6页Rare Metal Materials and Engineering

摘　　要：分别以国产近化学计量比SiC纤维和聚碳硅烷为纤维增强相和基体浸渍剂,采用聚合物先驱体浸渍裂解工艺,实现制备PyC界面层的SiC/SiC复合材料致密化。采用SEM对SiC纤维及SiC/SiC复合材料的形貌进行分析,采用三点弯曲法对材料力学性能进行测试。结果表明,国产近化学计量比SiC纤维具有高强高模的特点,界面层厚度是影响SiC/SiC复合材料的重要因素,在测试界面层厚度区间内,SiC/SiC复合材料力学性能随界面层厚度的增加先增长后降低。针对国产近化学计量比SiC纤维本征特性的聚合物先驱体浸渍裂解工艺,SiC/SiC复合材料性能较优异的界面层厚度为0.10~0.15μm。The near-stoichiometric ratio SiC fiber and polycarbosilane were used as fiber reinforced phase and matrix precursor to prepare SiC/SiC composites through polymer precursor infiltration and pyrolysis(PIP) method. The morphology of SiC fiber and SiC/SiC composite was analyzed by SEM, and the mechanical properties of the material were tested by three-point bending method. The results show that the near-stoichiometric ratio SiC fiber have the characteristics of high strength and high modulus, and the pyrolytic carbon interfacial layer occupies important influence on mechanical properties and fracture behavior of SiC/SiC composites. The mechanical properties of SiC/SiC composites first increase and then decrease with the increase of the thickness of the pyrolytic carbon interfacial layer. For the polymer precursor infiltration and pyrolysis method based on the intrinsic characteristics of the near-stoichiometric ratio SiC fiber, the suitable interface layer thickness of the SiC/SiC composite is 0.10~0.15 μm.

关 键 词：国产近化学计量比SiC纤维 聚合物先驱体浸渍裂解工艺 界面层 

分 类 号：TB332[一般工业技术—材料科学与工程]