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Characterization of Microwave-Induced Electric Discharge Phenomena in Metal–Solvent Mixtures

机译：金属溶剂混合物中微波诱导的放电现象的表征

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摘要

Electric discharge phenomena in metal–solvent mixtures are investigated utilizing a high field density, sealed-vessel, single-mode 2.45 GHz microwave reactor with a built-in camera. Particular emphasis is placed on studying the discharges exhibited by different metals (Mg, Zn, Cu, Fe, Ni) of varying particle sizes and morphologies in organic solvents (e.g., benzene) at different electric field strengths. Discharge phenomena for diamagnetic and paramagnetic metals (Mg, Zn, Cu) depend strongly on the size of the used particles. With small particles, short-lived corona discharges are observed that do not lead to a complete breakdown. Under high microwave power conditions or with large particles, however, bright sparks and arcs are experienced, often accompanied by solvent decomposition and formation of considerable amounts of graphitized material. Small ferromagnetic Fe and Ni powders (<40 μm) are heated very rapidly in benzene suspensions and start to glow in the microwave field, whereas larger particles exhibit extremely strong discharges. Electric discharges were also observed when Cu metal or other conductive materials such as silicon carbide were exposed to the microwave field in the absence of a solvent in an argon or nitrogen atmosphere.
机译：利用具有内置摄像头的高场密度，密封容器，单模2.45 GHz微波反应器，研究了金属与溶剂混合物中的放电现象。特别强调研究在不同电场强度下，有机溶剂（例如苯）中具有不同粒径和形态的不同金属（Mg，Zn，Cu，Fe，Ni）所表现出的放电。抗磁性和顺磁性金属（Mg，Zn，Cu）的放电现象在很大程度上取决于所用颗粒的大小。对于小颗粒，观察到短寿命的电晕放电不会导致完全击穿。但是，在高微波功率条件下或具有大颗粒的情况下，会出现明亮的火花和电弧，通常伴随有溶剂分解和大量石墨化材料的形成。较小的铁磁性Fe和Ni粉末（<40μm）在苯悬浮液中非常迅速地加热，并开始在微波场中发光，而较大的颗粒则表现出极强的放电。当将铜金属或其他导电材料（例如碳化硅）在没有溶剂的情况下在氩气或氮气气氛中暴露于微波场时，也会观察到放电。

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