Preparation and thermal stability of zirconia-doped mullite fibers via sol-gel method  

作　　者：Wei WANG Duan WENG Xiao-dong WU 

机构地区：[a] State Key Laboratory of New Ceramics & Fine Process, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China [b] The Second Artillery NCO Academy of PLA, Qingzhou, Shandong 262500, China

出　　处：《Progress in Natural Science:Materials International》2011年第2期117-121,共5页自然科学进展·国际材料（英文版）

基　　金：Projects(2009AA064801,2009AA064803) supported by the Ministry of Science and Technology of China

摘　　要：The zirconia-doped mullite fibers were prepared via a sol-gel method from aluminum isopropoxide-aluminum nitrate-tetraethyl orthosilicate system.The effects of zirconia doping on the sol spinnability,mullitization,structure and thermal stability of mullite fibers were investigated by means of Fourier transform infrared（FT-IR） spectroscopy,scanning electron microscopy（SEM） and X-ray diffraction（XRD）.The results showed that Zr—O—C bond was presented with the involvement of zirconium acetate,which accelerated the gelation process of the precursor sol.The mullitization process of the doped fibers was promoted by the formation of less middle-phase residues such as spinel.Among the samples investigated,the 1%ZrO₂-doped fibers exhibited the highest thermal stability with a grain growth rate of 11%（from 1 000℃to 1300℃）,which is only a half of that for pure mullite fibers.The zirconia-doped mullite fibers were prepared via a sol-gel method from aluminum isopropoxide-aluminum nitrate-tetraethyl orthosilicate system. The effects of zirconia doping on the sol spinnability, mullitization, structure and thermal stability of mullite fibers were investigated by means of Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM) and X-ray diffraction (XRD). The results showed that Zr—O—C bond was presented with the involvement of zirconium acetate, which accelerated the gelation process of the precursor sol. The mullitization process of the doped fibers was promoted by the formation of less middle-phase residues such as spinel. Among the samples investigated, the 1% ZrO2-doped fibers exhibited the highest thermal stability with a grain growth rate of 11% (from 1 000 °C to 1 300 °C), which is only a half of that for pure mullite fibers.

关 键 词：MULLITE fiber ZIRCONIA DOPING thermal stability 

分 类 号：TF841.4[冶金工程—有色金属冶金]