Induced electromagnetic pressure during microwave sintering of ZnO in magnetic field
Induced electromagnetic pressure during microwave sintering of ZnO in magnetic field
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DOI：
10.1016/j.jeurceramsoc.2012.11.021
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发表时间：
2013-06-01
影响因子：
5.7
通讯作者：
Marinel, Sylvain
中科院分区：
文献类型：
--
作者：
Badev, Alexander;Heuguet, Romain;Marinel, Sylvain
本文介绍了一种独特的技术方法，用于在纯氧化锌中使用两种不同的烧结方法来生产定制和控制微观结构。建立了常规和2.45 GHz微波烧结纯ZnO陶瓷的显微结构对比研究。收集了烧结行为和晶粒生长作为加热循环性质函数的数据。两步烧结循环的使用表明，在几乎完全抑制晶粒生长的情况下可以获得高密度。与传统烧结相比，微波加热样品显示出更致密的结构，因为两步加热样品在更短的烧结时间内呈现出最高的最终密度。作为半导体材料，该材料在h场中表现出更强的加热行为，这是由于加热周期开始时更高的能量吸收（更高的斜坡）造成的。在相同加热循环条件下，h场烧结球团比e场烧结球团具有更高的密度和粒度均匀性。这可能是由于提交到MW-H场的电流回路的综合效应引起的电磁压力。(C) 2012 Elsevier Ltd.版权所有。
This paper presents a unique technological approach for producing a tailored and controlled microstructure in pure zinc oxide using two different sintering methods. A microstructural comparative study between conventional and 2.45 GHz microwave sintered pure ZnO ceramics has been established. Data on the sintering behavior and grain growth as a function of the nature of the heating cycle are collected. The use of two step sintering cycles showed that high density can be achieved with almost complete suppression of grain growth. Compared to conventional sintering, microwave heated samples revealed a denser structure, as two step heated samples presented highest final densities for shorter sintering times. As a semiconductor, the material showed greater heating behavior in H-field which is traduced by higher energy absorption (higher ramp) at the beginning of the heating cycle. H-field sintered pellets showed higher densities and grain size uniformity than the ones sintered in E-field for identical heating cycles. This is likely due to an electromagnetic pressure induced by the combined effect of current loops submitted to a MW-H field. (C) 2012 Elsevier Ltd. All rights reserved.