Mian Yang,Kaihua Chen,Shenghui Guo,Ming Hou,Jiyun Gao,Junwen Zhou,Shuhao Shi,Li Yang
In this paper, the self-propagating reaction of the Ti–SiC–C system for synthesising Ti 3 SiC 2 -based diamond composites is ignited by the combustion of Ni–Al alloy powders in a microwave field. The heating curves of Ni–Al-assisted microwave sintering show that the self-propagating reaction could be successfully ignited after heating samples to 685.2 °C in a microwave field for 456 s. This finding indicates that ignition could occur at temperatures below the diamond graphitisation temperature (727 °C). X-ray diffraction analysis indicates that the sintered samples primarily comprise Ti 3 SiC 2 , TiC, Ti 5 Si 3 and C. Scanning electron microscopy coupled with energy dispersive spectroscopy observations demonstrates that the diamond grains are tightly bonded with the surrounding matrix and are intact. The best wear ratio of 302.26 was obtained for the Ti 3 SiC 2 -bonded diamond composite when the diamond grain size was 140/170 mesh and the molar ratio of Ti, SiC and C was 3:1.1:0.9.
In this study, Al-Mg-Sn-Ga anode material prepared by heating up to 800 °C in microwave field under different powers and heating up to 800 °C in conventional field is compared. The microstructure and corrosion morphology of aluminum alloy anode are observed by electron backscatter diffraction(EBSD) and scanning electron microscopy(SEM), and Tafel polarization curve , electrochemical impedance spectroscopy (EIS) and constant current are characterized by different melting modes. The results are showed that microwave can change the grain orientation of aluminum alloy anode and corrosion forms, compared to the conventional technology, the microstructure of the alloy electrode material can grow preferentially at (001), improve alloy anode electrochemical properties , by pitting corrosion forms into a uniform corrosion , improves the corrosion resistance of the anode and the anode utilization. At the same time, aluminum alloy anode has excellent discharge performance under microwave 2000 W treatment. The energy density and capacity density are 2729.3 Wh·kg −1 and 2596.6 mAh·g −1 , respectively, which are 44.03% and 42.26% higher than those of conventional muffle furnace melting. Therefore, microwave technology can improve the electrochemical performance by affecting the microstructure of alloy materials.
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