Abstract
Microwave sintering is an excellent technology for the rapid preparation of powder materials. Here, an investigation has been performed on the intensity distribution of microwave electric and magnetic fields in a metallic-ceramic composite and its effect on the sintering behaviour. The results show that the microstructure of the “metallic-ceramic” will induce a special local focus effect of microwave electric fields in some regions (e.g., the sintering-neck) during microwave processing. This focus effect has important relationship with the geometric configurations of particles, and may be an important factor for the rapid microstructure evolution during microwave sintering. This result is supported by the advanced synchrotron radiation computed tomography experimental observations of the microstructure evolution of AlSiC and SnSiO2 powders during an entire uninterrupted microwave sintering process. However, in terms of microwave magnetic fields, although it indicates that there is a local focus effect in the metallic-ceramic mixed particles composite, this focus effect is not significant and is just induced by the metallic particles. The ceramic particles will not influence the distribution of microwave magnetic fields whether they are far from or close to the metallic particles.
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