Synthesis, characterisation and thermal behaviour of new preceramic polymers for zirconium carbide
Synthesis, characterisation and thermal behaviour of new preceramic polymers for zirconium carbide
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DOI：
10.1179/1743676113y.0000000076
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发表时间：
2013-07
影响因子：
2.2
通讯作者：
Xue-yu Tao;Xian-Yong Wei;Q. Chen;W. Lu;M. Ma;Tong Zhao
中科院分区：
文献类型：
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作者：
Xue-yu Tao;Xian-Yong Wei;Q. Chen;W. Lu;M. Ma;Tong Zhao
通过聚锆氧烷与水杨醇的配体交换反应，合成了一种新型陶瓷先驱体聚合物聚锆醛（PZSA）。用傅里叶变换红外光谱和核磁共振氢谱分析了前驱体的化学结构。该前体是空气稳定的，并表现出优异的溶解性和流变性。采用热重/差热分析技术研究了聚合物的热分解过程。采用X射线衍射、透射电镜和元素分析等方法对PZSA在Ar气氛中的热分解产物进行了表征。该聚合物经过四步热分解，在1300°C下通过ZrO 2和碳在氩气中的碳热还原反应生成纳米ZrC，陶瓷产率为57.8%。
A new preceramic polymer, polyzirconosaal (PZSA), was synthesised by the ligand exchange reaction between polyzirconoxane and salicyl alcohol. The chemical structure of the precursor was analysed by Fourier transform infrared spectroscopy and 1H nuclear magnetic resonance. The precursor was air stable and exhibited excellent solubility and rheology. The thermal decomposition processes of the polymer were studied using the technique of thermogravimetric/differential thermal analysis. The thermal decomposition products of PZSA obtained in Ar atmosphere were characterised by X-ray diffraction, transmission electron microscopy and element analysis. The polymer underwent a thermal decomposition in four steps, and nanosized ZrC was formed at 1300°C via carbothermal reduction reaction of ZrO2 and carbon in argon with ceramic yield of 57·8%.