Investigation of Electrochemical, Optical and Thermal Effects during Flash Sintering of 8YSZ

被引:173
作者
Biesuz, Mattia [1 ]
Pinter, Lorenzo [1 ]
Saunders, Theo [2 ]
Reece, Mike [2 ]
Binner, Jon [3 ]
Sglavo, Vincenzo M. [1 ]
Grasso, Salvatore [2 ,4 ]
机构
[1] Univ Trento, Dept Ind Engn, I-38123 Trento, Italy
[2] Queen Mary Univ London, Sch Engn & Mat Sci, London E1 4NS, England
[3] Univ Birmingham, Sch Met & Mat, Birmingham B15 2TT, W Midlands, England
[4] Southwest Jiaotong Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Adv Technol, Chengdu 610031, Sichuan, Peoples R China
基金
英国工程与自然科学研究理事会;
关键词
flash sintering; electrochemistry; electrochemical blackening; yttria stabilized zirconia; electronic conductivity; YTTRIA-STABILIZED ZIRCONIA; ELECTRIC-FIELD; CUBIC ZIRCONIA; CONDUCTIVITY; RUNAWAY; PHOTOEMISSION; DEFECTS; FSPS;
D O I
10.3390/ma11071214
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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.
引用
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页数:15
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