Effects of SiC interfacial coating on mechanical properties of carbon fiber needled felt reinforced sol-derived Al2O3 composites  

SiC界面涂层对碳纤维针刺毡增强Al2O3复合材料力学性能的影响（英文）

作　　者：Kuan-hong ZENG Qing-song MA Xing-yu GU 曾宽宏;马青松;顾星宇(国防科技大学新型陶瓷纤维及其复合材料重点实验室)

机构地区：[1]Science and Technology on Advanced Ceramic Fibers&Composites Laboratory,National University of Defense Technology,Changsha 410073,China

出　　处：《Transactions of Nonferrous Metals Society of China》2020年第2期463-471,共9页中国有色金属学报（英文版）

摘　　要：3D carbon fiber needled felt and polycarbosilane-derived SiC coating were selected as reinforcement and interfacial coating,respectively,and the sol-impregnation-drying-heating(SIDH)route was used to fabricate C/Al2O3 composites.The effects of Si C interfacial coating on the mechanical properties,oxidation resistance and thermal shock resistance of C/Al2O3 composites were investigated.It is found that the fracture toughness of C/Al2O3 composites was remarkably superior to that of monolithic Al2O3 ceramics.The introduction of SiC interfacial coating obviously improved the strengths of C/Al2O3 composites although the fracture work diminished to some extent.Owing to the tight bonding between SiC coating and carbon fiber,the C/SiC/Al2O3 composites showed much better oxidation and thermal shock resistance over C/Al2O3 composites under static air.分别采用3D碳纤维针刺毡为增强体以及聚碳硅烷(PCS)衍生SiC涂层为界面相,通过溶胶-浸渍-干燥-热处理(SIDH)技术制备C/Al2O3复合材料,研究SiC界面涂层对C/Al2O3复合材料力学性能、抗氧化性能和抗热震性能的影响。结果表明,C/Al2O3复合材料的断裂韧性显著优于Al2O3单体陶瓷,引入SiC界面涂层后,尽管断裂功有一定程度下降,但C/Al2O3复合材料的强度得到明显提高;得益于SiC涂层和C纤维之间的强结合,C/SiC/Al2O3复合材料在静态空气中表现出明显优于C/Al2O3复合材料的抗氧化和抗热震性能。

关 键 词：ALUMINA carbon fiber reinforcement interfacial coating mechanical properties oxidation resistance thermal shock resistance 

分 类 号：TB33[一般工业技术—材料科学与工程]