研究了作为涂层粘结剂的Y溶胶转变为凝胶后在加热过程中发生的热分解和相变过程, 结果表明: 在115℃凝胶中大量有机溶剂和自由水逸出, 在180--280℃凝胶分子间发生缓慢的缩合反应并脱去结合水, 在380℃羧酸盐分解为碱式碳酸盐, 在440℃碳酸盐分解并析出Y2O3微晶, 在600℃Y凝胶分解完全并转化为α--Y2O3。
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℃.
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