摘要
以乙烯基三乙氧基硅烷作前驱体在碳纤维表面制备了溶胶-凝胶涂层。通过扫描电镜、能量分散谱仪以及热重分析对涂层进行表征。通过单纤维拉伸强度测试研究碳纤维的力学性能,采用动态接触角测定碳纤维的表面能。结果表明,溶胶-凝胶涂层改善了碳纤维的抗氧化性能和力学性能。与未涂层纤维相比,涂层碳纤维的起始氧化温度提高了100℃,单纤维拉伸强度提高了5.9％～12.1％,但是涂层脱落及表面裂纹导致碳纤维的拉伸强度随着氧化温度的升高而降低。另外,溶胶-凝胶涂层降低了碳纤维的表面能,使其具有较好的疏水性能。
The protective sol-gel coating was prepared on carbon fibers with vinyltriethoxysilane as the precursor.The coatings were characterized by scanning electron microscopy,energy dispersive spectrometer and thermogravimetric analysis.The mechanical property of carbon fibers was investigated by single fiber tensile strength tests,and the surface energy of carbon fibers was determined by the dynamic contact angle.The results showed that,the solgel coating improved the oxidation resistance and mechanical properties of carbon fibers.The sol-gel coatings increased the onset oxidative temperature by about 100 ℃,and the single fiber tensile strength of coated carbon fibers was increased by 5.9％-12.1％ compared with uncoated ones.However,the debonding of coatings and surface cracks resulted in the reduction of tensile strength for coated carbon fibers with the increase of the oxidation temperature.Furthermore,the sol-gel coatings decreased the surface energy of carbon fibers,which showed a better hydrophobic property.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2014年第10期20-24,37,共6页
Materials Reports
基金
山西省自然科学基金(2012011021-2)
中国科学院创新基金(Y1SC6N1781)
关键词
抗氧化
碳纤维
溶胶-凝胶
力学性能
表面能
oxidation resistance
carbon fibers
sol-gel
mechanical property
surface energy
