SiO_2对溶胶-凝胶法制备的ZrO_2纤维相变和微观组织的影响  

Effects of silica on phase transformation and microstructure of zirconia fiber

作　　者：蔡武集 何静[1] 袁梦娇 周彤[1] 陈立富[1] 

机构地区：[1]厦门大学材料学院特种先进材料实验室高性能陶瓷纤维教育部重点实验室,福建厦门361005

出　　处：《功能材料》2016年第9期9153-9157,共5页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51072169)

摘　　要：通过氧氯化锆与过氧化氢的反应得到氧化锆溶胶,与SiO_2溶胶混合后,制备了不同SiO_2含量的氧化锆纤维,采用SEM、XRD、DTA、FT-IR、^(29)SiNMR、TEM等对纤维相组成和微观结构进行了系统研究。结果表明,少量SiO_2可以显著提高四方相ZrO_2的稳定性,抑制单斜相的形成,避免纤维"皮芯结构"的形成。此外SiO_2可以有效抑制晶粒长大,从而达到细晶的作用,获得无表面缺陷、致密、柔性的ZrO_2纤维。Zirconia fibers containing different amount of silica are prepared using zirconium oxychloride,hydrogen peroxide and silica sol as the raw materials and by sol-gel method.SEM,XRD,DTA,FT-IR,29 ^Si NMR and TEM are used to characterize the zirconia-silica fibers.It has been found that silica can significantly stabilize the tetragonal ZrO_2 phase,inhibiting its phase transformation to the monoclinic phase.As the consequence,the formation of sheath-core structure in the zirconia-silica fibers has been prevented.Silica can also effectively inhibit the grain growth,resulting in crack-free,transparent,dense and flexible ceramic fibers.

关 键 词：氧化锆-SiO2纤维 四方相 相变 溶胶-凝胶 

分 类 号：TQ343.5[化学工程—化纤工业]