Kinetic analysis of the polymer burnout in ceramic thermoplastic processing of the YSZ thin electrolyte structures using model free method

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• 作者：Mehdi Salehi^a ; ^b ; ^{Mehdi.Salehi@empa.ch} ; ^{chemehdi3333@gmail.com} ; Frank Clemens^a ; Thomas Graule^a ; Bernard Grobé ; ty^b
• 关键词：Thermoplastic process ; Binder burnout ; Model free method ; YSZ electrolytes ; Kinetics analysis
• 刊名：Applied Energy
• 出版年：2012
• 期刊代码：2_03062619
• 类别：pw
• 出版时间：July, 2012
• 卷：95
• 期：Complete
• 页码：147-155
• 文件大小：991 K

摘要

Polymeric binder burnout during thermoplastic processing of yttria stabilized zirconia (YSZ) ceramics were analyzed using thermogravimetric analysis (TGA). The debinding kinetics of the stearic acid/polystyrene binder have been described using model free methods and compared with the decomposition rate of the pure polymers. The apparent activation energy E_伪 as a function of debinding progress 伪 was calculated in two atmospheres (argon and air) by three different methods: Ozawa-Flynn-Wall (OFW), Kissinger-Akahira-Sunose (KAS) and Friedman. The evolution of E_伪 with 伪 is compatible with the evaporation of stearic acid and the unzipping and thermo-oxidative decomposition mechanisms proposed for polystyrene. The apparent activation energies obtained for the experiments under argon revealed the increased concentration of weak links in polystyrene introduced during kneading of the feedstock. Extrapolation of the kinetic parameters obtained in one run to calculate decomposition rates under different heating rates confirmed the excellent predictive power of the direct methods.