采用硝酸铝（AN）和异丙醇铝（AIP）作为铝源,正硅酸乙酯（TEOS）为硅源,添加10%聚乙烯吡咯烷酮（PVP）为纺丝助剂,合成了莫来石溶胶,在溶胶-凝胶转变过程中控制溶胶固含量在35%左右,通过干法纺丝可得到连续莫来石凝胶纤维,经过1300℃高温烧结后得到直径16μm莫来石陶瓷纤维。通过高温DSC-TG和XRD测试发现,烧结温度为700℃时开始形成亚稳态莫来石,烧结温度为1300℃时形成了最终态莫来石。通过扫描电镜（FE-SEM）对初生纤维和陶瓷纤维进行测试,制得的莫来石陶瓷纤维表面光滑,缺陷少,结构较致密。
The mullite sol was prepared by sol-gel method from an aqueous solution of aluminum nitrate（AN）,aluminum isopropoxide（AIP） and tetraethylorthosilicate（TEOS）.PVP was used as the spinning aid.Continuous mullite ceramic fibres were fabricated by dry spinning technology and sintered at 1300 ℃.The mullite sol can be continuous spinning by determining better solid content at about 35% in the concentration process.The green fibers and sintered fibres were observed and analyzed by DSC-TG,XRD and SEM.The results show that the sintered fibres have smooth surface and few defects,the diameter of sintered fibers is 10 μm～20 μm,only mullite crystals are formed after sintering at 1300 ℃.
参考文献
| [1] | Martin Schmucker;Hartmut Schneider;Thomas Mauer .Temperature-dependent evolution of grain growth in mullite fibres[J].Journal of the European Ceramic Society,2005(14):3249-3256. |
| [2] | Yabin Zhang;Yaping Ding;Jiqiang Gao .Mullite fibres prepared by sol-gel method using polyvinyl butyral[J].Journal of the European Ceramic Society,2009(6):1101-1107. |
| [3] | Martin Schmucker;Hartmut Schneider;Thomas Mauer .Temperature-dependent evolution of grain growth in mullite fibres[J].Journal of the European Ceramic Society,2005(14):3249-3256. |
| [4] | T. Ebadzadeh .Formation of mullite from precursor powders: sintering, microstructure and mechanical properties[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2003(1/2):56-61. |
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