Thermal Debinding Kinetics of Gelcast Ceramic Parts via a Modified Independent Parallel Reaction Model in Comparison with the Multiple Normally Distributed Activation Energy Model.
Thermal Debinding Kinetics of Gelcast Ceramic Parts via a Modified Independent Parallel Reaction Model in Comparison with the Multiple Normally Distributed Activation Energy Model.
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DOI：
10.1021/acsomega.2c02121
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发表时间：
2022-06-14
期刊：
影响因子：
4.1
通讯作者：
Huang, Jindi
中科院分区：
文献类型：
--
作者：
Li, Jing;Huang, Jindi
这项工作旨在为凝胶铸造陶瓷零件的热脱脂动力学提供有用的见解，特别是涉及保温的脱脂动力学预测。脱脂实验是在空气气氛下、在35-900℃的温度范围内、在差式热重分析仪上以五种加热速率（5、8、10、15和20℃/min）进行的。使用改进的独立平行反应（IPR）模型和多重正态分布活化能模型（M-DAEM）模拟转化率（α）和热解速率（dα/dT）数据。通过检查实验结果与预测能力之间的一致性来评估和比较它们的有效性。结果表明，改进的 IPR 模型和 M-DAEM 对线性加热条件下的热脱脂动力学均具有较高的可预测性。拟合质量参数（Fit）分别小于1.406和1.01%。 M-DAEM 计算的活化能（Ei，i = 1、2、3、4 和 5）范围为 153.312 至 217.171 kJ/mol。通过改进的IPR模型计算出的伪组分1至5的Ei之间的关系是转化率的函数。 Ei 值为 E1(α) = 116.750 + 11.153α – 26.772α2 + 4.362α3 kJ/mol，E2(α) = 139.595 – 66.162α + 75.702α2 – 38.041α3 kJ/mol，E3(α) = 190.854 + 135.755α – 214.801α2 + 116.093α3 kJ/mol，E4(α) = 64.068 + 280.086α – 380.270α2 + 264.724α3 kJ/mol，E5(α) = 188.257 – 77.086α +分别为 74.129α2 – 48.669α3 kJ/mol。然而，值得注意的是，对于具有保持阶段的线性热脱脂过程，改进的IPR模型预测的α和dα/dT曲线的偏差小于8%，优于M-DAEM预测的曲线。因此，我们相信所提出的改进的IPR模型适合于描述涉及凝胶注模生坯保温的热脱脂动力学。
This work aims to provide useful insights into the thermal debinding kinetics of gelcast ceramic parts, especially for debinding kinetics prediction involving heat preservation. Debinding experiments were conducted in a differential thermogravimetric analyzer at five heating rates (5, 8, 10, 15, and 20 °C/min) in the temperature range of 35–900 °C under an air atmosphere. The conversion (α) and pyrolysis rate (dα/dT) data were simulated using a modified independent parallel reaction (IPR) model and a multiple normally distributed activation energy model (M-DAEM). Their validity was assessed and compared by checking the agreement between the experimental results and the prediction capability. The results showed that both the modified IPR model and M-DAEM had high predictability for thermal debinding kinetics under linear heating conditions. The fitting quality parameters (Fit) were less than 1.406 and 1.01%, respectively. The activation energies (Ei, i = 1, 2, 3, 4, and 5) calculated by the M-DAEM ranged from 153.312 to 217.171 kJ/mol. The relationships between Ei of pseudo components 1 to 5 calculated by the modified IPR model were a function of the conversion rate. The Ei values were E1(α) = 116.750 + 11.153α – 26.772α2 + 4.362α3 kJ/mol, E2(α) = 139.595 – 66.162α + 75.702α2 – 38.041α3 kJ/mol, E3(α) = 190.854 + 135.755α – 214.801α2 + 116.093α3 kJ/mol, E4(α) = 64.068 + 280.086α – 380.270α2 + 264.724α3 kJ/mol, and E5(α) = 188.257 – 77.086α + 74.129α2 – 48.669α3 kJ/mol, respectively. However, it is noteworthy that the α and dα/dT curves predicted by the modified IPR model with a deviation of less than 8% were better than those predicted by the M-DAEM for the linear thermal debinding process with the holding stage. Accordingly, it is believed that the proposed modified IPR model is suitable for describing the thermal debinding kinetics involving the heat preservation of gelcast green parts.
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