Evolution of thermophysical properties of gel-cast SiAlON green bodies in thermal debinding process

Huang, Jindi; Li, Jing

doi:10.1007/s41779-021-00697-9

Cited by 1 publication

(3 citation statements)

References 31 publications

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“…The specific experimental process can be found in our previous research. 23 In this study, the dried sample was utilized for the subsequent thermal debinding kinetic experiments.…”

Section: Experimental Section and Methodsmentioning

confidence: 99%

“…As depicted in Figure , the process includes the preparation of a mixed powder slurry and gelling agent solution, casting, demolding, drying, and debinding. The specific experimental process can be found in our previous research . In this study, the dried sample was utilized for the subsequent thermal debinding kinetic experiments. …”

Section: Experimental Section and Methodsmentioning

confidence: 99%

“…The master decomposition curve of the feedstocks was established to help optimize the thermal debinding process. Similarly, polymers formed from some gel systems often exhibit multiple pyrolysis peaks, and the pyrolysis reaction does not follow a single mechanism function. − This problem widely exists in the fields of biomass and coal pyrolysis. For instance, Torres-Sciancalepore et al studied the kinetic and thermodynamic behavior of the pyrolysis of quince waste and pectin-free quince waste after extraction.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Debinding Kinetics of Gelcast Ceramic Parts via a Modified Independent Parallel Reaction Model in Comparison with the Multiple Normally Distributed Activation Energy Model

Huang

2022

ACS Omega

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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/d T ) 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 ( E i , i = 1, 2, 3, 4, and 5) calculated by the M-DAEM ranged from 153.312 to 217.171 kJ/mol. The relationships between E i of pseudo components 1 to 5 calculated by the modified IPR model were a function of the conversion rate. The E i values were E 1 (α) = 116.750 + 11.153α – 26.772α 2 + 4.362α 3 kJ/mol, E 2 (α) = 139.595 – 66.162α + 75.702α 2 – 38.041α 3 kJ/mol, E 3 (α) = 190.854 + 135.755α – 214.801α 2 + 116.093α 3 kJ/mol, E 4 (α) = 64.068 + 280.086α – 380.270α 2 + 264.724α 3 kJ/mol, and E 5 (α) = 188.257 – 77.086α + 74.129α 2 – 48.669α 3 kJ/mol, respectively. However, it is noteworthy that the α and dα/d T 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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“…The specific experimental process can be found in our previous research. 23 In this study, the dried sample was utilized for the subsequent thermal debinding kinetic experiments.…”

Section: Experimental Section and Methodsmentioning

confidence: 99%