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Focusing effect of electromagnetic fields and its influence on sintering during the microwave processing of metallic particles

Published online by Cambridge University Press:  14 December 2015

Yongcun Li ,
Feng Xu ,
Xiaofang Hu ,
Yunbo Luan ,
Zhijun Han  and
Zhiyong Wang
Yongcun Li
Affiliation:
College of Mechanics, Shanxi Key Laboratory of Material Strength & Structural Impact, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
Feng Xu*
Affiliation:
CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei 230026, Anhui, China
Xiaofang Hu
Affiliation:
CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei 230026, Anhui, China
Yunbo Luan
Affiliation:
College of Mechanics, Shanxi Key Lab of Material Strength & Structural Impact, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
Zhijun Han
Affiliation:
College of Mechanics, Shanxi Key Lab of Material Strength & Structural Impact, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
Zhiyong Wang
Affiliation:
College of Mechanics, Shanxi Key Lab of Material Strength & Structural Impact, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
*
a)Address all correspondence to this author. e-mail: xufeng3@ustc.edu.cn
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Abstract

Microwave sintering is a novel and efficient technology for the rapid preparation of metallic materials. In this paper, an investigation has been performed on the distribution of microwave electromagnetic fields in a metallic particle system and its influence on sintering behavior. The results show that the microstructure of the “metallic-void” will induce a nonuniform distribution and focusing effect of electromagnetic fields during microwave processing, which may accelerate the sintering process. However, further study shows that the focusing effect will decline as the neck grows larger, and will also decline from outside to inside within the loosely packed powder system, which will result in the slowdown of the sintering rate. These results were supported by the synchrotron radiation computed tomography experimental observation of the microstructure evolution of metallic powders during an entire uninterrupted microwave sintering process.

Keywords

microwave heatingsinteringmicrostructurex-ray tomography
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 23 , 14 December 2015 , pp. 3663 - 3670
Copyright
Copyright © Materials Research Society 2015 

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References

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