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Abnormal grain growth of ZnO ceramics

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2019, 29(6), pp.251-256
  • DOI : 10.6111/JKCGCT.2019.29.6.251
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering
  • Received : December 3, 2019
  • Accepted : December 16, 2019
  • Published : December 31, 2019

KIM YOUNG JUNG 1

1선문대학교

Accredited

ABSTRACT

In the process of ZnO ceramic sintering at a temperature of 1385°C, higher than the normal sintering temperature,some grains were growth up to mm scale. When sintered at 1400°C for 8 hours, the size of the grains that are not involved in the abnormal growth is as large as 30~40 μm, but the size of the abnormal grown grain reaches 1,000 μm, 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.

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