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以先驱体聚碳硅烷(PCS)和低分子添加物钛酸四正丁酯(Ti(OC4H9))为混合体系,采用原位转化法在碳纤维表面上制备了表面层为纳米Ti_2的TiO_2/SiC纳米功能陶瓷膜.研究了Ti(OC4H9)用量、熟化时间等因素对TiO_2的表面层的致密性和粒子尺寸的影响.XRD分析表明:纳米复合陶瓷膜的组成为红金石相TiO_2和SiC.X射线能谱仪测试的结果表明:表面层的成分为低分子Ti(OC4H9)的成分,即经过100 h的熟化,Ti(OC4H9)从PCS基体中逐渐析出到其表面.SEM照片显示:低分子Ti(OC4H9)用量为45%质量分数,熟化时间100 h时形成了致密的平均粒径100 nm TiO_2表面层.复合纳米陶瓷膜能有效地改善碳纤维的抗氧化性.
The precursor of polycarbosilane (PCS) and low molecular weight additive (Ti (OC4H9)) was used as a mixed system to prepare TiO 2 / SiC Nano-functional ceramic membrane.The effects of the amount of Ti (OC4H9), aging time and other factors on the densification and particle size of the surface layer of TiO_2 were studied.The XRD results showed that the composition of the nano-composite ceramic membrane was composed of the red stone phase TiO_2 and SiC.X The results of XRD showed that the composition of the surface layer was the composition of the low molecular Ti (OC4H9), that is, the Ti (OC4H9) precipitated gradually from the PCS matrix to its surface after 100 h of ripening.EM photo showed that the low molecular weight The mass fraction of Ti (OC4H9) was 45%, and the dense surface layer of 100 nm TiO2 with 100 nm ripening time was formed.The composite nano-ceramic membrane can effectively improve the oxidation resistance of carbon fiber.