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Microwave processing and properties of ceramics with different dielectric loss

Authors
Journal
Journal of the European Ceramic Society
0955-2219
Publisher
Elsevier
Publication Date
Volume
19
Issue
3
Identifiers
DOI: 10.1016/s0955-2219(98)00203-9
Keywords
  • Microwave Processing
  • Microstructure – Final
  • Al2O3
  • Zro2
  • Ferroelectric Properties.

Abstract

Abstract Microwave sintering behaviors of three kinds of ceramics with different dielectric loss [Al 2O 3, Ce–Y–ZrO 2 and lead-based relaxor ferroelectrics (PMZNT)] in 2·45 GHz microwave furnace were described. Measurement of sample densities showed an enhancement of the sintering processing for all materials studied. For PMZNT and Ce–Y–ZrO 2 with high dipolar loss or ionic conductive loss, the associated microstructure examined using scanning electron microscopy showed that microwave-sintered compacts produced much finer grain sizes at near theoretical density compared to conventional sintering. Resulting material properties, such as flexure strength and breakdown strength, were also increased due to developed microstructure in microwave processing. However, a comparable grain size and properties were observed for high pure Al 2O 3 with low dielectric loss in microwave and conventional methods. ©

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