期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 26, 期 13, 页码 2611-2617出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2005.06.045
关键词
fibres; sol-gel processes; sintering; Al2O3; MgO; ZrO2
Alumina fibres and alumina zirconia fibres were prepared by sol-gel process. The starting materials used for the preparation of alumina and zirconia sol were aluminium-tri-isopropoxide and zirconium oxychloride respectively. Alumina sol and zirconia sol were mixed in definite proportions, so that the final composition contains 10 wt.% ZrO2. Alumina and alumina-zirconia fibres were prepared from the alumina sol and mixed sol respectively. MgO was introduced in the fibres by adding MgNO3 into the sol. Sintered alumina fibre has alpha-Al2O3 phase and alumina-zirconia fibre has alpha-Al2O3 and t-ZrO2 phases. The phase transition to alpha-Al2O3 takes place at higher temperature in the alumina fibre with MgO, whereas the effect is less in alumina-zirconia fibre. The addition of MgO reduces the grain size and increases the tensile strength. (c) 2005 Elsevier Ltd. All rights reserved.
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