【摘要】 以短碳纤维(CF)为增强体,利用硝酸和空气氧化法对短碳纤维进行表面处理,采用挤出成型法制备短碳纤维增强的CF/TiO2复合载体材料。考察了处理前后碳纤维表面性质的变化以及碳纤维添加量对TiO2载体性能的影响,并采用扫描电镜(SEM)、傅里叶红外光谱(FT-IR)、比表面积(BET)等手段对碳纤维和CF/TiO2复合载体进行了表征。结果表明,碳纤维经硝酸和空气氧化处理后,表面更加粗糙、轴向沟槽明显增多加深;600℃氮气气氛焙烧后,随碳纤维含量的增加,CF/TiO2复合载体的抗压强度先增大后降低,硝酸处理碳纤维用量为5%时,复合载体的抗压强度最高可达237.5N/cm,较之空气处理及未处理的复合载体分别提高了10.9%和48.5%,增强效果最为理想;并且硝酸处理碳纤维的引入不会对CF/TiO2复合载体的比表面积和孔结构产生不良影响。更多还原

【Abstract】 Short carbon fibers(CF)were treated by air oxidation and nitric acid oxidation,respectively.Thereafter the treated and the untreated fibers were doped into titanium dioxide matrix to form carbon fiber-reinforced titania(CF/TiO2)composites with different CF contents by extrusion molding method.Effects of CF content on the properties of CF/TiO2 composites were investigated,and the carbon fibers and CF/TiO2 composites were measured by SEM,FT-IR and BET methods.The results showed that carbon fiber surface modification by oxidation can deepen axial grooves and enlarge specific surface area as well as its roughness.With increasing fiber content,the compressive strength of composites calcined at600℃ under nitrogen atmosphere increased firstly and then decreased.The maximum value(237.5N/cm)at 5% content of carbon fiber treated by nitric acid was achieved,which was increased by 10.9% and 48.5%,respectively,than those composites treated by air oxidation and without oxidation.It was also found that introduction of carbon fibers didn’t had unfavorable effect on the surface area and pore size distribution of composites.更多还原