中间相沥青基碳纤维C/SiC复合材料制备及其性能研究  

Preparation and Properties of Mesophase Pitch-based Carbon Fiber Reinforced C/SiC Composites

作　　者：易增博 赵宗严 江汛 郭美佑 张建国 张鸿翔 黄立叶 王刚 孙海潮 李瑞苗 YI Zengbo;ZHAO Zongyan;JIANG Xun;GUO Meiyou;ZHANG Jianguo;ZHANG Hongxiang;HUANG Liye;WANG Gang;SUN Haichao;LI Ruimiao(Tiance Technology Co.,Ltd.,Xi'an 710100,Shaanxi,China;Shaanxi Pitch-based Carbon Fiber Technology Co.,Ltd.,Tongchuan 727000,Shaanxi,China)

机构地区：[1]陕西天策新材料科技有限公司,西安710100 [2]陕西沥青基碳纤维科技有限公司,陕西铜川727000

出　　处：《高科技纤维与应用》2025年第1期11-18,共8页Hi-Tech Fiber and Application

基　　金：中央引导地方科技发展资金,自由探索类基础研究项目(2022ZY2-JCYJ-01-04)。

摘　　要：采用短切中间相沥青基碳纤维(MPCF)作为增强相,制备多孔C/C复合材料,采用反应熔渗法将C/C复合材料转变成C/SiC复合材料。通过SEM和压汞仪分析,研究了C/C复合材料的孔隙特性;对C/C复合材料的力学性能和热性能进行测试表征。通过SEM和XRD衍射研究了C/SiC复合材料的微观形貌和物相成分;对C/SiC复合材料的力学性能和热性能进行测试表征。结果表明:C/C复合材料的密度1.475 g/cm^(3),显气孔率29.96%,平均孔径1.63μm,弯曲强度和模量分别达到87.33 MPa和32.08 GPa。面内(X-Y)和厚度(Z)热导率分别达到133.31 W/(m·K)和28.30 W/(m·K)。制备的C/SiC复合材料密度为2.493 g/cm^(3),几乎全致密。相比C/C复合材料,熔渗后C/SiC复合材料弯曲性能和热导率显著提高,弯曲强度和模量分别达到162.33 MPa和229.31 GPa。面内(X-Y)和厚度(Z)方向的热导率分别达到196.21 W/(m·K)和79.37 W/(m·K)。Using short-cut mesophase pitch-based carbon fiber(MPCF)as a reinforcing phase,porous C/C composites were prepared,and the C/C composites were transformed into C/SiC composites using reactive infiltration.The pore characteristics of the C/C composites were investigated through SEM and mercury porosimetry analysis,and the mechanical and thermal properties of the C/C composites were tested and characterized.The microstructure and phase composition of the C/SiC composites were investigated through SEM and XRD diffraction,and the mechanical and thermal properties of the C/SiC composites were tested and characterized.The results showed that the density of the C/C composites was 1.475 g/cm^(3),the apparent porosity was 29.96%,the average pore size was 1.63μm,and the bending strength and modulus reached 87.33 MPa and 32.08 GPa,respectively.The in-plane(X-Y)and thickness(Z)thermal conductivities reached 133.31 W/(m·K)and 28.30 W/(m·K),respectively.The prepared C/SiC composites had a density of 2.493 g/cm^(3) and were almost fully dense.Compared with C/C composites,the bending performance and thermal conductivity of the infiltrated C/SiC composites were significantly improved,with bending strength and modulus reaching 162.33 MPa and 229.31 GPa,respectively.The in-plane(X-Y)and thickness(Z)thermal conductivities reached 196.21 W/(m·K)and 79.37 W/(m·K),respectively.

关 键 词：中间相沥青基碳纤维 C/C复合材料 C/SIC复合材料 弯曲性能 热导率 

分 类 号：TQ342.74[化学工程—化纤工业]