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Materials 2016, 9(3), 132;

Discussion on Local Spark Sintering of a Ceramic-Metal System in an SR-CT Experiment during Microwave Processing

College of Mechanics, Taiyuan University of Technology, Taiyuan 030024, China
CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei 230026, China
Author to whom correspondence should be addressed.
Academic Editor: Eugene A. Olevsky
Received: 15 January 2016 / Revised: 16 February 2016 / Accepted: 16 February 2016 / Published: 26 February 2016
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In this paper, local spark sintering of a ceramic-metal system (SiO2-Sn) during microwave processing was examinedby means of synchrotron-radiation-computed tomography technology. From the reconstructed 3-D and cross-section images of the specimen, adensification process was observed below the melting point of Sn, and then the specimen came into a rapid densification stage. These results may be due to the local spark sintering induced by the high-frequency alternating microwave electric fields. As the metallic particles Sn were introduced, the microstructure of “ceramic-metal” will lead to a non-uniform distribution and micro-focusing effect from electric fields in some regions (e.g., the neck). This will result in high-intensity electric fields and then induce rapid spark sintering within the micro-region. However, in the subsequent stage, the densification rate declined even when the specimen was not dense enough. The explanation for this is that as the liquid Sn permeated the gaps between SiO2, the specimen became dense and the micro-focusing effect of electric fields decreased. This may result in the decrease or disappearance of spark sintering. These results will contribute to the understanding of microwave sintering mechanisms and the improvement of microwave processing methods. View Full-Text
Keywords: microwave sintering; microstructureevolution; metal; synchrotron radiation computed tomography microwave sintering; microstructureevolution; metal; synchrotron radiation computed tomography

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Li, Y.; Xu, F.; Hu, X.; Dong, B.; Luan, Y.; Xiao, Y. Discussion on Local Spark Sintering of a Ceramic-Metal System in an SR-CT Experiment during Microwave Processing. Materials 2016, 9, 132.

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