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

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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.

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Funding

This work is financially supported by the National Natural Science Foundation of China (No. 52004112), the Science and Technology Program of Education Department of Jiangxi Province in China (GJJ170527, GJJ200848), the Program of Qingjiang Excellent Young Talents of Jiangxi University of Science and Technology (JXUSTQJYX2020016), and the Scientific Research Foundation of Jiangxi University of Science and Technology (205200100517).

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Authors and Affiliations

  1. Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, No. 86 Hongqi Road, Ganzhou City, 341000, Jiangxi Province, China

    Jindi Huang & Jing Li

  2. School of Metallurgical Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, Jiangxi, China

    Jindi Huang & Jing Li

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  1. Jindi Huang
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Jindi Huang performed the experiment, analyzed and processed the experimental data, wrote the manuscript, and provided part of the financial support; Jing Li designed the experiment, reviewed and edited the manuscript, and provided part of the financial support.

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Correspondence to Jing Li.

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Huang, J., Li, J. Evolution of thermophysical properties of gel-cast SiAlON green bodies in thermal debinding process. J Aust Ceram Soc 58, 347–355 (2022). https://doi.org/10.1007/s41779-021-00697-9

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