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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

  • Long Zhang (张龙)Email author
  • Xiaomin Zhang
  • Hengwei Zheng
Advanced Materials
  • 11 Downloads

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.

Key words

field assisted sintering technique generalized thermoelastic theory thermal wave vacancy concentration difference sintering activation energy 

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Copyright information

© Wuhan University of Technology and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Long Zhang (张龙)
    • 1
    • 2
    Email author
  • Xiaomin Zhang
    • 2
  • Hengwei Zheng
    • 1
  1. 1.Department of Theoretical and Applied MechanicsChongqing University of Science and TechnologyChongqingChina
  2. 2.Department of Engineering MechanicsChongqing UniversityChongqingChina

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