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http://dx.doi.org/10.6111/JKCGCT.2019.29.6.251

Abnormal grain growth of ZnO ceramics  

Kim, Young Jung (Dept. of Advanced Materials Engineering, SunMoon University)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.29, no.6, 2019 , pp. 251-256 More about this Journal
Abstract
In the process of ZnO ceramic sintering at a temperature of 1385℃, higher than the normal sintering temperature, some grains were growth up to mm scale. When sintered at 1400℃ for 8 hours, the size of the grains that are not involved in the abnormal growth is as large as 30~40 ㎛, but the size of the abnormal grown grain reaches 1,000 ㎛, which is more than 10,000 times bigger in volume than the normal one within 8 hr growth. As a cause of rapid and abnormal grain growth, primary particle size distribution, compaction density variation within sample and doping of impurities could be considered. The primary particle size distribution could be considered main reason for abnormal grain growth but no solid evidence was obtained. Through the observation of the microstructure, it is presumed that the giant grains grow absorbing the neighbor grains through a grain rotation process.
Keywords
ZnO; Abnormal grain growth; Rapid grain growth;
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