The densification behaviors of MgO-doped-Al₂O₃ ceramics in the flashing stage and the steady stage were investigated using the classic kinetic model. The results show that the most densification of MgO-doped Al₂O₃ was completed during the flashing stage. The densification mechanism transferred from particle rearrangement resulted from Columbic force among particles under the effect of electrical field in the flashing stage to the lattice diffusion in the steady stage. Therefore, the densification rate in the steady stage dramatically decreased. Additionally, the estimated densification activation energy in the steady stage of flash sintering is 396 kJ/mol, much lower than the activation densification of lattice diffusion measured from conventional sintering, likely due to the effect of electric field/current-induced point defects on the diffusion.

中文翻译：

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Al2O3 陶瓷在闪蒸过程中的致密化行为

采用经典动力学模型研究了MgO掺杂-Al ₂ O ₃陶瓷在闪蒸阶段和稳态阶段的致密化行为。结果表明，MgO掺杂的Al ₂ O _{3最致密化}在闪现阶段完成。致密化机制由闪蒸阶段电场作用下颗粒间的库伦力引起的颗粒重排转移到稳态阶段的晶格扩散。因此，稳定阶段的致密化率急剧下降。此外，估计闪速烧结稳定阶段的致密化活化能为 396 kJ/mol，远低于传统烧结测得的晶格扩散活化致密化，这可能是由于电场/电流诱导的点缺陷对晶格的影响。扩散。