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Chin J Mater Res  2010, Vol. 24 Issue (5): 483-486    DOI:
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Thermal Decomposition and Crystallization of Precursor Sol for Preparing Oxidation Resistant Coatings on Intermetallic TiAl
TIAN Xiao, JIA Qing, CUI Yuyou, YANG Rui
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
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TIAN Xiao JIA Qing CUI Yuyou YANG Rui. Thermal Decomposition and Crystallization of Precursor Sol for Preparing Oxidation Resistant Coatings on Intermetallic TiAl. Chin J Mater Res, 2010, 24(5): 483-486.

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Abstract  The thermal decomposition and subsequent crystallization process of Y sol after gelation were investigated by thermogravimetry--differential scanning calorimetry--mass spectrometry (TG--DSC--MS) coupling techniques, X-ray diffraction  (XRD) and Fourier transform infrared spectrometry (FTIR). The results show that Y gel loses lots of organic solvents and free water at 115℃. The hydroxyl condensation between gel molecules takes place slowly from 180℃ to 280℃. DSC curve of Y gel has two exothermic peaks in the range of 280--600℃, which are contributed to the transformation from carboxylate to subcarbonate at 380℃ and the formation of Y2O3 crystallite from decomposition products of subcarbonate at 440℃. Y gel completely transforms into α--Y2O3 at 600℃.
Key words:  inorganic non--metallic materials              sol--gel        Y2O3        TG--DSC--MS        thermal decomposition     
Received:  01 February 2010     
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