Discussion on magnetic-induced polarization Ampere’s force by in situ observing the special particle growth of alumina during microwave sintering
Discussion on magnetic-induced polarization Ampere’s force by in situ observing the special particle growth of alumina during microwave sintering
复制标题
原位观察微波烧结过程中氧化铝特殊颗粒生长探讨磁致极化安培力
DOI：
10.1016/j.ceramint.2016.02.042
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发表时间：
2016-05
影响因子：
5.2
通讯作者：
Li Yongcun
中科院分区：
文献类型：
--
作者：
Hu Xiaofang;Wang Yang;Liu Wenchao;Li Yongcun
采用同步辐射CT（SR-CT）原位研究了氧化铝陶瓷微波烧结过程中内部微观结构的演变。在整个烧结过程中，从不同烧结时间的样品的实验图像中连续观察到两种特殊的显微组织演变现象，我们称之为“抑制颗粒生长”和“颗粒均匀化”。直接从全场SR-CT结果中提取的“平均颗粒半径”和“颗粒半径标准差”随烧结时间的变化曲线进一步证实了这两种特殊现象。提出了一个极化安培力模型来解释这些特殊现象，该模型引入了磁场对绝缘陶瓷材料的影响，这是一个在以往的研究中很少讨论的话题。极化安培力模型可以解释原位实验中观察到的这两种特殊烧结现象。一方面，陶瓷颗粒可能承受指向颗粒中心的“安培力”，从而可能导致特殊的抑制颗粒生长现象;另一方面，大颗粒可能承受强大的力，这可能解释颗粒均匀化的另一种特殊现象。反过来，这两种特殊的现象也可以作为我们的极化安培力模型的可能的实验证据。该研究为揭示微波烧结过程中的复杂机理，制备具有预期微观结构和优异性能的材料提供了一定的帮助。
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.
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影响因子：
6.2
作者：
D. Demirskyi;D. Agrawal;A. Ragulya
通讯作者：
D. Demirskyi;D. Agrawal;A. Ragulya
DOI：
10.1002/chin.201021216
发表时间：
2010-04
期刊：
ChemInform
影响因子：
--
作者：
M. Oghbaei;O. Mirzaee
通讯作者：
M. Oghbaei;O. Mirzaee
DOI：
10.1016/s0955-2219(03)00217-6
发表时间：
2004
期刊：
--
影响因子：
--
作者：
M. Mizuno;S. Obata;S. Takayama;S. Ito;Nobuhisa Kato;T. Hirai;Motoyasu Sato
通讯作者：
M. Mizuno;S. Obata;S. Takayama;S. Ito;Nobuhisa Kato;T. Hirai;Motoyasu Sato
影响因子：
3.2
作者：
Rybakov, K. I.;Semenov, V. E.;Thumm, M.
通讯作者：
Thumm, M.
DOI：
10.1016/j.jeurceramsoc.2012.11.021
发表时间：
2013-06-01
影响因子：
5.7
作者：
Badev, Alexander;Heuguet, Romain;Marinel, Sylvain
通讯作者：
Marinel, Sylvain