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- Title
Flash Sintering of Oxide Ceramics under Microwave Heating.
- Authors
Bykov, Yu. V.; Egorov, S. V.; Eremeev, A. G.; Plotnikov, I. V.; Rybakov, K. I.; Sorokin, A. A.; Kholoptsev, V. V.
- Abstract
We report on the results of the analysis of the effect of flash sintering, which is observed upon heating compacted powder materials by high-intensity microwave radiation. Ceramic samples of Y2O3, MgAl2O4, and Yb: (LaO)2O3 were sintered to a density exceeding 98-99% of the theoretical value during 0.5-5 min without isothermal hold. The specific microwave power absorbed volumetrically in the samples was 20-400 W/cm3. Based on the analysis of the experimental data (microwave radiation power and heating and cooling rates) and of the microstructure of the obtained materials, we propose a mechanism of flash sintering based on the evolution of the thermal instability and softening (melting) of the grain boundaries. The proposed mechanism also explains the flash sintering effect observed when a dc or a low-frequency ac voltage is applied to the samples. The microwave heating makes it possible to implement flash sintering without using electrodes for supplying energy to the articles being sintered.
- Subjects
OXIDE ceramics; MICROWAVE heating; THERMAL instability; CRYSTAL grain boundaries; CERAMIC materials
- Publication
Technical Physics, 2018, Vol 63, Issue 3, p391
- ISSN
1063-7842
- Publication type
Article
- DOI
10.1134/S1063784218030052