Development and Comparison of Field Assisted Sintering Techniques to Densify CeO2 Ceramics
Development and Comparison of Field Assisted Sintering Techniques to Densify CeO2 Ceramics
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DOI：
10.1016/j.jeurceramsoc.2022.06.079
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发表时间：
2022-07
影响因子：
5.7
通讯作者：
R. Harrison;J. Morgan;J. Buckley;S. Bostanchi;C. Green;R. White;D. Pearmain;T. Abram;D. Goddard;N.J. Barron
中科院分区：
文献类型：
--
作者：
R. Harrison;J. Morgan;J. Buckley;S. Bostanchi;C. Green;R. White;D. Pearmain;T. Abram;D. Goddard;N.J. Barron
采用常规烧结和场助烧结技术对CeO2进行致密化处理，考察了烧结温度、保温时间、气氛、电场强度和极性等工艺参数对致密化过程的影响。与氩气气氛相比，在1400℃静态空气气氛中保温2小时的CS提供了最高的密度和晶粒度，这是因为保持了近化学计量比保持了烧结动力学。SPS在相似的烧结温度(1300℃)下生产出致密的陶瓷，但大大减少了烧结保持率(5分钟)和循环时间。然而，由于直流电的极性导致氧离子向正极扩散，导致了微观结构的不均匀。FS是在交变电场下进行的，在~1100°C的烧结温度下，保持时间约为1小时，可产生密度相当的样品，且不会因使用交流电而产生不均匀。
Cerium dioxide (CeO2) was densified by conventional and field assisted sintering techniques in order to examine the effect of a range of sintering parameters on the resultant pellet microstructure, namely: temperature, hold time, atmosphere, electric field strength and polarity. CS at 1400 °C for 2 h in static air atmospheres provided the highest densities and grain sizes compared with an argon atmosphere, due to the retention of near stoichiometry maintaining sintering kinetics. SPS produced dense ceramics at similar sintering temperatures (1300 °C), but with greatly reduced sintering hold (5 min) and cycle times. However, microstructural inhomogeneity arose from the direct current polarity which led to oxygen ion diffusion toward the positive electrode. FS was performed with an alternating current electric field and produces samples of comparable density at sintering temperatures of ~1100 °C for a hold time of around 1 h with no inhomogeneity due to the alternating current employed.