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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

[Image: see text] 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...

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Autores principales: Li, Jing, Huang, Jindi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2022
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9201889/
https://www.ncbi.nlm.nih.gov/pubmed/35722015
http://dx.doi.org/10.1021/acsomega.2c02121
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author Li, Jing
Huang, Jindi
author_facet Li, Jing
Huang, Jindi
author_sort Li, Jing
collection PubMed
description [Image: see text] 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 (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/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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spelling pubmed-92018892022-06-17 Thermal Debinding Kinetics of Gelcast Ceramic Parts via a Modified Independent Parallel Reaction Model in Comparison with the Multiple Normally Distributed Activation Energy Model Li, Jing Huang, Jindi ACS Omega [Image: see text] 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 (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/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. American Chemical Society 2022-05-30 /pmc/articles/PMC9201889/ /pubmed/35722015 http://dx.doi.org/10.1021/acsomega.2c02121 Text en © 2022 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by-nc-nd/4.0/Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/).
spellingShingle Li, Jing
Huang, Jindi
Thermal Debinding Kinetics of Gelcast Ceramic Parts via a Modified Independent Parallel Reaction Model in Comparison with the Multiple Normally Distributed Activation Energy Model
title Thermal Debinding Kinetics of Gelcast Ceramic Parts via a Modified Independent Parallel Reaction Model in Comparison with the Multiple Normally Distributed Activation Energy Model
title_full Thermal Debinding Kinetics of Gelcast Ceramic Parts via a Modified Independent Parallel Reaction Model in Comparison with the Multiple Normally Distributed Activation Energy Model
title_fullStr Thermal Debinding Kinetics of Gelcast Ceramic Parts via a Modified Independent Parallel Reaction Model in Comparison with the Multiple Normally Distributed Activation Energy Model
title_full_unstemmed Thermal Debinding Kinetics of Gelcast Ceramic Parts via a Modified Independent Parallel Reaction Model in Comparison with the Multiple Normally Distributed Activation Energy Model
title_short Thermal Debinding Kinetics of Gelcast Ceramic Parts via a Modified Independent Parallel Reaction Model in Comparison with the Multiple Normally Distributed Activation Energy Model
title_sort thermal debinding kinetics of gelcast ceramic parts via a modified independent parallel reaction model in comparison with the multiple normally distributed activation energy model
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9201889/
https://www.ncbi.nlm.nih.gov/pubmed/35722015
http://dx.doi.org/10.1021/acsomega.2c02121
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