Inhomogeneous reduction and its relation to grain growth of titania during flash sintering

SCRIPTA MATERIALIA

卷:155

Article

Charalambous, Harry¹  Jha, Shikhar Krishn¹  Wang, Han²  Phuah, Xin Li²  Wang, Haiyan²  Tsakalakos, Thomas¹ 

[1] Rutgers State Univ, Dept Mat Sci & Engn, 607 Taylor Rd, Piscataway, NJ 08854 USA

[2] Purdue Univ, Sch Mat Engn, Neil Armstrong Hall Engn,701 West Stadium Ave, W Lafayette, IN 47907 USA

关键词: Flash sintering;    Rutile;    Titania;    Peltier effect;    Reduction;   

DOI  :  10.1016/j.scriptamat.2018.06.017

来源: Elsevier

【 摘 要 】

Flash sintering under DC electric field partially reduces titania (rutile) and promotes abnormal grain growth near the anode. The resulting reduction in grain boundary density reduces the number of vacancy traps and enhances the O-2(-) ion conductivity through the specimen, facilitating greater non-stoichiometry. The observed gradient of densification and grain-growth across the two ends has been linked to the Peltier effect which causes heating at the anode-electrode junction and cooling at the cathode-electrode junction. Published by Elsevier Ltd on behalf of Acta Materialia Inc.

【 授权许可】

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