Abstract
Microwave sintering has been paid a considerable amount of attention by researches as a novel technology for the preparation of dense structural ceramics recently. However, the mature theory has not been established due to the technical difficulties. Synchrotron Radiation X-ray Computed Tomography (SR-CT) technique is a latest nondestructive detection technology. Applying the SR-CT technology on the research of microwave sintering can realize the observation of the evolution of microstructure under microwave and high-temperature field in a nondestructive, 3D and real-time way, provide more accurate experiment data for revealing the kinetics mechanism, and offer direct foundation for establishing the theory of microwave sintering. But due to the high requirements of experiment skills, it is difficult to apply the SR-CT technique into the in-situ observation of the microstructure evolution process during microwave sintering. Especially, duo to the restriction of SR-CT experiment platform, to design a microwave sintering equipment is quite a big problem. In this paper, according to the analysis of the requirements of SR-CT technique and the restriction of SR-CT experiment platform, the corresponding solutions for these difficulties such as separated structure arrangement, two-ply heat insulation and high precise rotation device were put forward, and a microwave sintering furnace exclusively to SR-CT experiment was designed. The testing on the heat insulation structure and the precision calibration of the rotation device was conducted, the results show that the heat insulation effect is good and the rotation precise achieves the required standard. Besides, depending on this equipment, the first observation of the microstructure evolution of SiC during microwave sintering was carried out, and a few sintering phenomena during three sintering stages were clearly observed. The experiment results indicate that the all the specifications of the equipment meet the design requirements.
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