This research aims to deepen the understanding of the interaction mechanisms between\nmicrowave and matter in a metal-ceramic system based on in situ synchrotron radiation computed\ntomography. A special internal ââ?¬Å?core-shellââ?¬Â microstructure was discovered for the first time and used\nas an indicator for the interaction mechanisms between microwave and matter. Firstly, it was proved\nthat the microwave magnetic field acted on metal particles by way of inducing an eddy current in\nthe surface of the metal particles, which led to the formation of a ââ?¬Å?core-shellââ?¬Â microstructure in the\nmetal particles. On this basis, it was proposed that the ceramic particles could change the microwave\nfield and open a way for the microwave, thereby leading to selective heating in the region around the\nceramic particles, which was verified by the fact that all the ââ?¬Å?core-shellââ?¬Â microstructure was located\naround ceramic particles. Furthermore, it was indicated that the ceramic particles would gather\nthe microwaves, and might lead to local heating in the metal-ceramic contact region. The focusing\nof the microwave was proved by the quantitative analysis of the evolution rate of the ââ?¬Å?core-shellââ?¬Â\nmicrostructure in a different region. This study will help to reveal the microwave-matter interaction\nmechanisms during microwave sintering.
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