Ceramics-Silikáty 58, (2) 118 - 122 (2014) |
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EFFECT OF ZIRCONIA ON CRYSTALLIZATION OF YTTRIUM ALUMINUM GARNET PRECURSOR GEL FIBERS
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Tan Hongbin 1,2, Ma Xiaoling 2, Lu Jinhua 1,
Li Kezhi 1
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1 State Key Laboratory of Solidification Processing, Northwestern Polytechnical University,
Xi
2 School of Materials Science and Engineering
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Keywords: Zr-YAG, Fibers, Sol-Gel Method, Activation Energy
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The zirconia-yttrium aluminum garnet (Zr-YAG) long fibers were successfully prepared through sol-gel method following
by sintering at 1000oC, with aluminum powder, yttria, zirconium oxychloride and aluminum chloride as raw materials and
polyvinylpyrrolidone as spinning additive. YAG phase was only observed in the fibers with smooth surface after sintering at
1000oC for 2 hours. However, a rough surface with an average grain size of 2 μm could appear when gel fibers were sintered
at 1400oC for 6 hours. Calculated from Kissinger equation, the crystallization activation energy value (Ea) of Zr-YAG fibers
was 59.69 kJ/mol. The Ea value is lower than YAG crystallization values by other authors. |
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