Journal
CERAMICS INTERNATIONAL
Volume 42, Issue 7, Pages 8296-8302Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2016.02.042
Keywords
Microwave processing; Sintering; X-ray methods; Microwave-induced polarization Ampere's force
Categories
Funding
- National Natural Science Foundation of China, China [11272305, 11172290, 11472265, 10902108]
- National Basic Research Program of China (973 Program) [2012CB937504]
- Anhui Provincial Natural Science Foundation China [1508085MA17]
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Internal microstructure evolution during alumina microwave sintering was in situ investigated with synchrotron radiation computed tomography (SR-CT). Two special microstructure evolution phenomena were continuously observed from the experimental images of the sample at different sintering times throughout the entire process of the sintering, which we called suppressed particle growth and particle homogenization. These two special phenomena were further confirmed by the two curves of average particle radius and particle radius standard deviation versus sintering time which were directly extracted from the full-field SR-CT results. A polarization Ampere's force model was proposed to provide a possible explanation for these special phenomena, which introduced the effect of magnetic field on insulating ceramic materials, a topic rarely discussed in previous studies. The polarization Ampere's force model may explain these two special sintering phenomena observed in the in situ experiment. On one hand, ceramic particles may sustain Ampere's force that pointed toward the particle center according to this model, thereby possibly leading to the special suppressed-particle-growth phenomenon; on the other hand, large particles may sustain a strong force in our model, which may explain the other special phenomenon of particle homogenization. In return, these two special phenomena can also serve as probable experimental evidence of our polarization Ampere's force model. This study may offer some help for revealing the complex mechanisms during microwave sintering and for preparing materials with expected microstructure and excellent properties. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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