期刊
SCRIPTA MATERIALIA
卷 211, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2022.114508
关键词
Flash sintering; Electric field assisted sintering; Joule heat; Defects; Yttria stabilized Zirconia
类别
资金
- German Academic Exchange Service (DAAD), under the program Combined Study and Practice Stays for Engineers from Developing Countries (KOSPIE) with Indian IITs, 2020 [57525292]
- German Science Foundation (DFG), under priority program Fields Matter [SPP 1959, BR 3418/1-2]
Flash sintering is a novel technique that densifies ceramics at moderate furnace temperature and in short time. The mechanism behind flash sintering is not fully understood, but this study experimentally demonstrated that it is primarily dominated by Joule heating.
Flash sintering is a novel electric field and current assisted sintering technique which densify ceramics at moderate furnace temperature and in short time (few seconds) as compared to the conventional sintering techniques. The onset of flash encompasses three unique characteristics, (i) non-linear rise in conductivity, (ii) luminescence and (iii) rapid densification. the mechanism behind the flash phenomena is not fully understood yet. The present work experimentally demonstrated that the densification in flash sintering is primarily dominated by Joule heating. Herein, we distinguished the onset of flash and the degree of densification of cubic zirconia in sintering atmospheres with different oxygen partial pressures. In this study, we demonstrate that the flash onset temperature and densification are independently influenced by the sintering atmosphere during flash sintering. Furthermore, the extent of densification is not directly influenced by the current density rather, by the power dissipated in the sample. (c) 2022 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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