TiB_2掺杂对碳纤维增强锂铝硅复合材料抗氧化性的影响

Effect of TiB_2 Doping on Oxidation Resistance of Carbon Fiber Reinforced LAS Composites

目的研究含有不同质量分数的TiB_2的C_f/LAS复合材料的抗弯强度变化规律。方法以碳纤维、TiB_2、硝酸锂、硝酸铝、硅溶胶和氨水为主要原料,采用溶胶凝胶法结合浆料浸渍-热压烧结工艺,制备了加入TiB_2的碳纤维增强锂铝硅微晶玻璃(LAS)复合材料C_f/LAS(TiB_2),利用XRD、FTIR、万能材料试验机、SEM等对C_f/LAS(TiB_2)复合材料的性能和微观结构进行研究。结果 TiB_2的质量分数为1%,3%,5%,9%的Cf/LAS(TiB_2)复合材料,在1000℃热处理30 min后的强度保留率分别为2.9%,29.1%,44.0%,50.0%。结论材料的强度保留率随TiB_2含量的增多而上升,因此C_f/LAS(TiB_2)复合材料的抗氧化性随着TiB_2含量的增加而增强。

The paper aims to study change rules of flexural strength after doping different mass of TiB2in Cf/LAS composites.With carbon fiber,TiB2,lithium nitrate,aluminum nitrate,silica sol and ammonia as the main raw materials,sol-gel method combined with hot pressing sintering process was used to prepare TiB2carbon fiber reinforced LAS composites Cf/LAS(TiB2).Properties and microstructure of Cf/LAS(TiB2)composites were investigated by XRD,FTIR,universal material testing machine and SEM.The strength retention rates of Cf/LAS(TiB2)composites with TiB2content of1%,3%,5%,and9%after heat treatment at1000℃for30min were2.9%,29.1%,44.0%,and50.0%.The strength retention of the material increases with the increase of TiB2content.The oxidation resistance of Cf/LAS(TiB2)composites increases with the increase of TiB2content.