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

Evolution of thermophysical properties of gel-cast SiAlON green bodies in thermal debinding process The thermal conduction, thermal expansion, and dynamic thermomechanical behaviors of gel-cast SiAlON green bodies during thermal debinding were systematically studied using thermal analysis methods. The evolution of the thermophysical properties of the green body was revealed. The results showed that residual moisture had a great impact on the deformation of the green body during debinding and may even be greater than the deformation caused by the gel pyrolysis process (2.8% residual moisture). Under the current test conditions, the maximum linear expansion coefficient of the green body was 1.85 × 10−5 °C−1, the thermal diffusivity ranged from 0.21 to 0.46 mm2·s−1, and the specific heat ranged from 0.37 to 0.55 J·(g·K)−1. The storage modulus curve exhibited bimodal distribution with two peak intervals, and the range of values was 35–47 MPa. These results can provide the key thermophysical parameters for the study of the stress and strain behaviors of green bodies during thermal debinding. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of the Australian Ceramic Society Springer Journals

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

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References (37)

Publisher
Springer Journals
Copyright
Copyright © The Author(s) under exclusive licence to Australian Ceramic Society 2021
ISSN
2510-1560
eISSN
2510-1579
DOI
10.1007/s41779-021-00697-9
Publisher site
See Article on Publisher Site

Abstract

The thermal conduction, thermal expansion, and dynamic thermomechanical behaviors of gel-cast SiAlON green bodies during thermal debinding were systematically studied using thermal analysis methods. The evolution of the thermophysical properties of the green body was revealed. The results showed that residual moisture had a great impact on the deformation of the green body during debinding and may even be greater than the deformation caused by the gel pyrolysis process (2.8% residual moisture). Under the current test conditions, the maximum linear expansion coefficient of the green body was 1.85 × 10−5 °C−1, the thermal diffusivity ranged from 0.21 to 0.46 mm2·s−1, and the specific heat ranged from 0.37 to 0.55 J·(g·K)−1. The storage modulus curve exhibited bimodal distribution with two peak intervals, and the range of values was 35–47 MPa. These results can provide the key thermophysical parameters for the study of the stress and strain behaviors of green bodies during thermal debinding.

Journal

Journal of the Australian Ceramic Society – Springer Journals

Published: Feb 1, 2022

Keywords: Gel-casting; Thermal debinding; Thermophysical properties; Dynamic thermomechanical analysis

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