Effect of Initial Grain Size on Crack Healing Behavior under DC Electric Field of Zirconia (8Y‐CSZ) Ceramic
Effect of Initial Grain Size on Crack Healing Behavior under DC Electric Field of Zirconia (8Y‐CSZ) Ceramic
复制标题
直流电场下初始晶粒尺寸对氧化锆（8Y-CSZ）陶瓷裂纹愈合行为的影响
DOI：
10.1002/adem.202201807
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发表时间：
2023
影响因子：
3.6
通讯作者：
Yamamoto Takahisa
中科院分区：
文献类型：
--
作者：
Takahashi Shoma;Morita Koji;Nambu Kohta;Terada Daisuke;Kobayashi Kiyoshi;Tokunaga Tomoharu;Yamamoto Takahisa
研究了初始晶粒尺寸对直流电场下细晶和粗晶8mol%Y2O3稳定的立方ZrO 2（8 Y-CSZ）多晶微裂纹愈合行为的闪光事件的影响。愈合行为强烈依赖于初始晶粒尺寸，并且在细晶粒8 Y-CSZ中比在粗晶粒8 Y-CSZ中明显加速。由于闪光事件下的裂纹愈合高于无电场静态退火处理的裂纹愈合，因此，闪光事件引起的非热效应不能仅用焦耳热引起的热效应来解释裂纹愈合增强现象。晶粒尺寸相关的愈合行为表明，晶界在闪光事件中起着重要作用，并且闪光愈合将通过场/电流增强的扩散过程，特别是通过阳离子的晶界扩散率来加速。
The effect of initial grain size on the flash event was examined in microcrack healing behavior under DC electric field in fine‐ and coarse‐grained 8 mol% Y2O3‐stabilized cubic ZrO2(8Y‐CSZ) polycrystals. The healing behavior depends strongly on the initial grain size and is apparently accelerated in fine‐grained 8Y‐CSZ than in coarse‐grained one. Since the crack healing under the flash event is higher than that of static annealing treatment without the electric field, the enhanced healing phenomena cannot be explained only by the thermal effect caused by Joule heating, but nonthermal effects caused by the flash event. The grain size‐dependent healing behavior indicates that the grain boundaries play an important role in the flash event and the flash healing would be accelerated through the field/current‐enhanced diffusional processes, especially through the grain boundary diffusivity of the cations.