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Thermal Wave Effect and Sintering Activation Energy at the Initial Stage of Field Assisted Sintering Process for Non-conductive Al2O3 Powders

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Abstract

The effect of thermal wave at the initial stage for non-conductive Al2O3 powders compact in field assisted sintering technique (FAST) was investigated. The Lord and Shulman type generalized thermoselastic theory was introduced to describe the influence of thermal-mechanical interaction, as well as the heat transport and thermal focusing caused by thermal wave propagation. The expression of vacancy concentration difference of the particles was deduced by considering transient thermal stress. Subsequently, the relationship between activation energy and vacancy concentration difference was obtained. The mechanism of surface diffusion, volume diffusion, simultaneous surface and volume diffusion was analyzed. The numerical simulations indicate that low sintering temperature can obtain high local temperature by the superposition effect of thermal wave. Vacancy concentration differences were improved during FAST compared with hot-pressure and pressureless sintering, thereby decreasing the sintering time. By contrast, the activation energy declined with the decrease of vacancy concentration difference in the neck growth process.

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Authors and Affiliations

  1. Department of Theoretical and Applied Mechanics, Chongqing University of Science and Technology, Chongqing, 401331, China

    Long Zhang  (张龙) & Hengwei Zheng

  2. Department of Engineering Mechanics, Chongqing University, Chongqing, 400044, China

    Long Zhang  (张龙) & Xiaomin Zhang

Authors
  1. Long Zhang  (张龙)
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  2. Xiaomin Zhang
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  3. Hengwei Zheng
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Correspondence to Long Zhang  (张龙).

Additional information

Funded by the National Natural Science Foundation of China(No.11602042), the Chongqing Research Program of Basic Research and Frontier Technology (No. cstc2016jcyjA0259), and the Scientific and Technological Research Program of Chongqing Municipal Education Commission(No. KJ1601304)

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Zhang, L., Zhang, X. & Zheng, H. Thermal Wave Effect and Sintering Activation Energy at the Initial Stage of Field Assisted Sintering Process for Non-conductive Al2O3 Powders. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 33, 1416–1421 (2018). https://doi.org/10.1007/s11595-018-1984-8

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  • DOI: https://doi.org/10.1007/s11595-018-1984-8

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