高温超导带材用YBCO前驱体的热分解非等温动力学研究

Non-isothermal decomposition kinetics of YBCO precursor for high temperature superconducting tape

基于金属有机物沉积法制备YBCO高温超导带材的研究现状,为了探索涂层导体超导层的快速制备工艺,开展了超导层前驱体的热分解动力学研究。在氩气条件下利用同步热分析仪获得丙酸为溶剂、乙酸盐为溶质的前驱体热分解过程的TG-DTG-DSC-MS曲线,采用普适积分法、微分法以及多重速率扫描Kissinger法相结合的方式确定YBCO超导相合成反应的机理和相关动力学参数。结果表明,从室温~900℃的升温过程中,前驱体的热分解反应可分为4个阶段。其中,第4阶段的YBCO超导相合成反应过程服从随机成核和随后生长的机理模型(n=2),热分解反应动力学补偿效应为lnA=0.120E-2.699。

Based on the research status of YBa2Cu3O7-δ(YBCO) high temperature superconducting tape prepared by metal organic deposition(MOD) method, in order to explore the rapid preparation method and approach of coated conductor superconducting layer, the thermal decomposition kinetics of superconducting layer precursor was studied. The precursor solution was prepared by using propionic acid as solvent, and acetate as solute. The TG-DTG-DSC-MS curves of thermal decomposition process under argon atmosphere were obtained by synchronous thermal analyzer. The synthesis mechanism of YBCO phase was determined by the combination of universal integral method, differential method and multi-rate scanning Kissinger method, and the related kinetic parameters were solved. The results show that the thermal decomposition processes of the precursor were divided into four stages from room temperature to 900 ℃ at different heating rates. The fourth stage of YBCO phase synthesis reaction obeyed the random nucleation and subsequent growth(n=2) model, and the kinetic compensation effect(KCE) of thermal decomposition reaction was lnA=0.120E-2.699.