Investigation of Electrochemical, Optical and Thermal Effects during Flash Sintering of 8YSZ.
Investigation of Electrochemical, Optical and Thermal Effects during Flash Sintering of 8YSZ.
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DOI：
10.3390/ma11071214
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发表时间：
2018-07-14
期刊：
影响因子：
--
通讯作者：
Grasso S
中科院分区：
文献类型：
--
作者：
Biesuz M;Pinter L;Saunders T;Reece M;Binner J;Sglavo VM;Grasso S
本文报道了8mol%氧化钇稳定的氧化锆（8 YSZ）闪速烧结过程中发生的电化学，光学和热效应。多晶和单晶样品的原位观察显示，在闪光烧结之前的孕育期内发生了电化学变黑/变暗。这种现象是由直流电场下阴极部分还原引起的。当使用低频AC场（0.1-10 Hz）时，在施加的极性切换之后，变黑是可逆的。热成像结合样品颜色变化和电导率映射给出了在闪速烧结事件的每个阶段期间发生的多物理现象的完整图片。阴极处的部分还原导致样品中的电性质的改变，并且靠近阴极的变黑区域比样品的其余部分更导电。电化学反应的不对称性质遵循场极性，并导致阳极和阴极之间的温度不对称，正电极趋于过热。还观察到，该现象受到电接触的质量和所使用的气氛的影响。
This paper reports the electrochemical, optical and thermal effects occurring during flash sintering of 8 mol % yttria-stabilized zirconia (8YSZ). In-situ observations of polycrystalline and single crystal specimens revealed electrochemical blackening/darkening during an incubation period prior to flash sintering. The phenomenon is induced by cathodic partial reduction under DC fields. When using a low frequency AC field (0.1–10 Hz) the blackening is reversible, following the imposed polarity switching. Thermal imaging combined with sample colour changes and electrical conductivity mapping give a complete picture of the multi-physical phenomena occurring during each stage of the flash sintering event. The partial reduction at the cathode causes a modification of the electrical properties in the sample and the blackened regions, which are close to the cathode, are more conductive than the remainder of the sample. The asymmetrical nature of the electrochemical reactions follows the field polarity and causes an asymmetry in the temperature between the anode and cathode, with the positive electrode tending to overheat. It is also observed that the phenomena are influenced by the quality of the electrical contacts and by the atmosphere used.
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影响因子：
3.2
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