摘要
采用炭纤维和陶瓷粉末混编技术将HfC粉引入到炭纤维预制体中,制备了含有HfC超高温陶瓷粉末的炭纤维预制体;随后采用化学气相渗透(CVI)和先驱体浸渍裂解工艺(PIP)制备了密度高达1.94 g/cm^(3)的C/C-SiC-HfC复合材料,分析了复合材料的微观结构及力学性能。结果表明,制备的复合材料主要由C、SiC及HfC等物相组成,复合材料的平均弯曲强度达到了78.3 MPa,平均压缩强度为127.9 MPa;断裂过程中,断口处出现明显的裂纹扩展、纤维拔出及脱粘现象,从而使得材料呈现出一定的假塑性断裂特征。
The carbon fiber and HfC powder were woven to prepare carbon fiber preform containing HfC powder.The as-prepared preform was densified by chemical vapor infiltration(CVI)and precursor infiltration pyrolysis(PIP)to fabricate the C/C-SiC-HfC composites with density of 1.94 g/cm^(3).The microstructures and mechanical properties of the C/C-SiC-HfC composites were investigated.Results show that the composites are composed of C,SiC and HfC phases.The average flexural strength and compressive strength of C/C-SiC-HfC composites are 78.3 MPa and 127.9 MPa,respectively.During the fracture process,obvious crack propagation,fiber debonding,fracture and pull-out are found on the fracture surface,resulting in pseudoplastic fracture characteristics of the composites to some extent.
作者
李洪涛
杨鑫
黄启忠
张泽
巴开勋
Li Hong-tao;Yang Xin;Huang Qi-zhong;Zhang Ze;Ba Kai-xun(State Key Laboratory of Powder Metallurgy,Central South University,Hunan Changsha 430081,China)
出处
《炭素技术》
CAS
北大核心
2022年第4期53-58,共6页
Carbon Techniques
基金
自然科学基金联合基金重点项目(U19A2088)
作者简介
李洪涛(1997-),男,硕士研究生,主要研究方向为耐烧蚀炭/炭复合材料,E-mail:1248978933@qq.com;通讯作者:杨鑫,副研究员,博导,主要研究方向为耐烧蚀炭/炭复合材料、炭/陶复合材料、抗氧化涂层及新型炭材料的制备与应用,E-mail:yangxincsu@csu.edu.cn。
