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http://dx.doi.org/10.12656/jksht.2022.35.2.57

Effect of Initial Particle Size Distribution of (K0.5Na0.5)NbO3 Powders on Microstructure of Their Sintered Ceramics  

Yoo, Il-Ryeol (School of Materials Science and Engineering, Kumoh National Institute of Technology)
Choi, Seong-Hui (School of Materials Science and Engineering, Kumoh National Institute of Technology)
Cho, Kyung-Hoon (School of Materials Science and Engineering, Kumoh National Institute of Technology)
Publication Information
Journal of the Korean Society for Heat Treatment / v.35, no.2, 2022 , pp. 57-65 More about this Journal
Abstract
In this study, the effect of the initial particle size distribution (PSD) of (K0.5Na0.5)NbO3 powders on the microstructure of sintered ceramics was investigated. (K0.5Na0.5)NbO3 powders with uni-, bi-, tri-, and quad-modal PSDs were obtained through a planetary ball-mill. For the specimens sintered at 1080℃, the growth of abnormal grains was promoted from the powders exhibiting quad- and tri-modal PSDs with a high content of large particles, resulting in a microstructure in which huge abnormal grains were predominant. However, as the number of peaks in PSD and the overall particle size decreased, the abnormal grain growth was suppressed and the grain growth of small particles started, resulting in a microstructure with a uniform grain size. For the specimens sintered at 1100℃, huge abnormal grains were not observed due to the decrease in the critical driving force for 2D nucleation even when powders with quad- and tri-modal PSDs were used. It was confirmed that when powder with unimodal PSD was used, a uniform microstructure that was not significantly affected by the sintering temperature could be obtained. The results of this study demonstrate that the microstructure of (K0.5Na0.5)NbO3-based ceramics can be controlled by controlling the particle size of the initial powder.
Keywords
$(K_{0.5}Na_{0.5})NbO_3$; Piezoelectric; Particle size distribution; Abnormal grain;
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