Thermal debinding behavior of a low-toxic DMAA polymer for gelcast ceramic parts based on TG-FTIR and kinetic modeling.
Thermal debinding behavior of a low-toxic DMAA polymer for gelcast ceramic parts based on TG-FTIR and kinetic modeling.
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基于 TG-FTIR 和动力学模型的凝胶注模陶瓷部件低毒 DMAA 聚合物的热脱脂行为
作者：
在这项工作中，通过非等温热重分析 (TG) 和 TG-FTIR 分析研究了低毒 N,N-二甲基丙烯酰胺 (DMAA) 凝胶聚合物的热解特性。此外，通过三种不同的动力学模型研究了凝胶注模 SiAlON 陶瓷部件的热脱脂动力学：Coats-Redfern (C-R) 方法、分布式活化能模型 (DAEM) 和三高斯 DAEM 反应模型 (3-DAEM)。通过与实验数据的比较，分析了三种模型对热脱脂动力学研究的合理性和适应性。结果表明，在100~320 ℃、320~520 ℃和520~600 ℃温度范围内分别观察到3个质量损失区，主要热解气体产物为CO2、H2O和CH4。 3-DAEM 计算的转化率（α）曲线比 C-R 和 DAEM 方法计算的转化率（α）曲线与实验值更加一致。拟合质量参数（Fit%）小于2.63%，3-DAEM计算的反应速率（dα/dT）曲线为双峰分布曲线，与实验结果吻合较好。 3-DAEM计算的全局热脱脂过程的动力学参数（E0,i, k0,i和σi）分别为116.00–145.79 kJ mol−1、1.10 × 109 s−1和1.67–43.25 kJ mol−1。预计该研究成果可用于帮助预测陶瓷零件凝胶注模的热脱脂行为并设计合理的脱脂技术。
In this work, the pyrolysis characteristics of a low-toxic N,N-dimethylacrylamide (DMAA) gel polymer was investigated through nonisothermal thermogravimetry (TG) and TG-FTIR analyses. Moreover, the thermal debinding kinetics of gelcast SiAlON ceramic parts was studied through three different kinetic models: the Coats–Redfern (C–R) method, distributed activation energy model (DAEM) and three-Gaussian-DAEM-reaction model (3-DAEM). The rationality and adaptability of the three models to the thermal debinding kinetics study were analyzed by comparison with experimental data. The results showed that three mass loss zones were observed in the temperature ranges of 100–320 °C, 320–520 °C and 520–600 °C, respectively, and the main pyrolysis gas products were CO2, H2O and CH4. The conversion rate (α) curves calculated by 3-DAEM were more consistent with the experimental values than those calculated with the C–R and DAEM methods. The fitting quality parameter (Fit%) was less than 2.63%, and the reaction rate (dα/dT) curves calculated by 3-DAEM were bimodal distribution curves, which were in good agreement with the experimental results. The kinetic parameters (E0,i, k0,i and σi) of the global thermal debinding process calculated by 3-DAEM were 116.00–145.79 kJ mol−1, 1.10 × 109 s−1 and 1.67–43.25 kJ mol−1, respectively. It is anticipated that the study achievements can be used to help predict the thermal debinding behavior and design a reasonable debinding technology for the gelcasting of ceramic parts.
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