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Electric forces effect on field-assisted sintering
Journal of the European Ceramic Society ( IF 5.7 ) Pub Date : 2020-06-29 , DOI: 10.1016/j.jeurceramsoc.2020.06.069
Mattia Biesuz , Vincenzo M. Sglavo

Electric forces acting on crystallographic defects generated at the flash onset or due to the surface polarization of the dielectric surrounding pores have been claimed to interact with the sintering kinetics upon flash processes. Herein, we estimate the magnitude of the external field-induced forces pointing out that the surface polarization does not play significant role on sintering. Moreover, the electric forces acting on charged defects are negligible when compared with the sintering stresses in the majority of flash experiments, only becoming comparable with the capillarity pressures when the external field is in the order of 103 V cm-1. Therefore, they can be of some relevance during flash sintering of resistive compounds like alumina or silicate glasses, they remaining normally not relevant otherwise.



中文翻译:

电力对现场辅助烧结的影响

据称作用于在闪光开始时产生的或由于围绕孔的电介质的表面极化而引起的晶体学缺陷的电力与闪光过程中的烧结动力学相互作用。本文中,我们估计了外部磁场感应力的大小,指出表面极化对烧结没有显著作用。此外,在大多数快速实验中,与烧结应力相比,作用在带电缺陷上的电力可以忽略不计,仅在外部电场约为10 3 V cm -1时才可与毛细压力相提并论。。因此,它们在电阻性化合物(如氧化铝或硅酸盐玻璃)的快速烧结过程中可能具有某些相关性,否则它们通常保持不相关性。

更新日期:2020-06-29
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