Ceramics-Silikáty 62, (3) 279 - 284 (2018) |
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PREPARATION AND GRAIN-GROWTH OF MAGNESIA-ALUMINA SPINEL/YTTRIUM ALUMINUM GARNET COMPOSITE FIBERS
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Ma Xiaoling 1,2, Lv Zhenlin 1, Tan Hongbin 2, 3, Nan Jiao 2, Wang Caixia 1
, 2
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1 School of Materials Science and Engineering, Xi'an University of Technology, Xi'an Shaanxi 710048, People's Republic of China
2 Shaanxi Engineering Center of Metallurgical Sediment Resource, Shaanxi University of Technology,Hanzhong Shaanxi 723000, People's Republic of China
3 School of materials science and Engineering, Southwest University of Science and Technology,
Mianyang 621010, People's Republic of China
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Keywords: Magnesia-alumina spinel, Yttrium aluminum garnet, Composite fibers, Grain growth mechanism
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Magnesia-alumina spinel/yttrium aluminum garnet composite fibers were prepared by sol-gel method. The spinnability of precursor sol remarkably depended on the addition amount of polyvinylpyrrolidone. Long gel fibers, with 80 cm in length, were obtained by adding 28wt% spinning additive. The phases of composite fibers were magnesia-alumina spinel and yttrium aluminum garnet after heating at 1400 °C for 2h. The Mg iron can hinder the yttrium aluminum garnet grain growth by solute drag and grain boundary pinning. The grain growth exponent was about 3.7 at 1600°C. |
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doi: 10.13168/cs.2018.0022
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