全长纤维针刺C/C-SiC复合材料的力学与热扩散性能  

Mechanical and Thermal Diffusion Properties of C/C-SiC Composites with Full-Length Fiber Needled Preform

作　　者：杜鹏程 王雅雷[1] 熊翔[1] 赵向坤 叶志勇 DU Peng-cheng;WANG Ya-lei;XIONG Xiang;ZHAO Xiang-kun;YE Zhi-yong(State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,Hunan,China)

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《矿冶工程》2021年第3期114-119,共6页Mining and Metallurgical Engineering

基　　金：国家自然科学基金(51602351);湖南省重点研发计划(2018GK2061)。

摘　　要：采用全长纤维针刺结构预制体,利用反应熔渗法制备了C/C-SiC复合材料,系统研究了复合材料的微观结构、弯曲性能和热扩散性能。结果表明,熔渗温度1 650-1 850℃条件下均可得到致密的C/C-SiC复合材料,提高熔渗温度可促进Si-C反应,降低残余Si含量。C/C-SiC复合材料的弯曲强度随熔渗温度升高而增大,且断裂模式表现出明显的假塑性,1 750℃制备的复合材料弯曲强度可达229±17 MPa。C/C-SiC复合材料面内方向热扩散系数明显高于层间方向,SiC含量的增加及非均质孔隙的存在均可促进复合材料的热扩散能力。C/C-SiC composites were prepared by reactive melting infiltration with full-length fiber needled preform.The microstructure,flexural properties and thermal diffusion properties of the composites were investigated systematically.Results show that dense C/C-SiC composites can be obtained at the melting infiltration temperature of 1650~1850℃.Increasing melting infiltration temperature can promote Si-C reaction and reduce residual Si.The flexural strength of C/C-SiC composites increases with the increasing of the melting infiltration temperature,and the fracture mode shows obvious pseudoplasticity.The flexural strength of C/C-SiC composites prepared at 1750℃can reach 229±17 MPa.In-plane thermal diffusivity of C/C-SiC composites is obviously higher than that in the interlaminar direction.Both an increase in the SiC content and the existence of heterogeneous pores can promote the thermal diffusivity of C/C-SiC composites.

关 键 词：碳纤维 熔渗法 碳基复合材料 全长纤维 针刺结构 C/C-SIC复合材料 熔渗温度 弯曲性能 热扩散性能 

分 类 号：TB332[一般工业技术—材料科学与工程]