Mogildea Marian, Mogildea George, Craciun Valentin, Zgura Sorin I
Institute of Space Science, MG-36, 077125 Magurele, Romania.
National Institute for Laser, Plasma and Radiation Physics, Laser Department, 409 Atomistilor St., 077125 Magurele, Romania.
Materials (Basel). 2021 Feb 22;14(4):1036. doi: 10.3390/ma14041036.
The effects induced by microwave field upon tungsten wires of different diameters were investigated. Tungsten wires with 0.5 and 1.0 mm diameters were placed in the focal point of a single-mode cylindrical cavity linked to a microwave generator and exposed to microwave field in ambient air. The experimental results showed that the 0.5 mm diameter wire was completely vaporized due to microwaves strong absorption, while the wire with 1 mm diameter was not ignited. During the interaction between microwaves and tungsten wire with 0.5 mm diameter, a plasma with a high electronic excitation temperature was obtained. The theoretical analysis of the experiment showed that the voltage generated by metallic wires in interaction with microwaves depended on their electric resistance in AC and the power of the microwave field. The physical parameters and dimension of the metallic wire play a crucial role in the ignition process of the plasma by the microwave field. This new and simple method to generate a high-temperature plasma from a metallic wire could have many applications, especially in metal oxides synthesis, metal coatings, or thin film deposition.
研究了微波场对不同直径钨丝的影响。将直径为0.5毫米和1.0毫米的钨丝置于与微波发生器相连的单模圆柱形腔的焦点处，并在环境空气中暴露于微波场。实验结果表明，直径为0.5毫米的钨丝由于微波的强烈吸收而完全汽化，而直径为1毫米的钨丝未被点燃。在微波与直径为0.5毫米的钨丝相互作用过程中，获得了具有高电子激发温度的等离子体。对该实验的理论分析表明，金属丝与微波相互作用产生的电压取决于其交流电阻和微波场的功率。金属丝的物理参数和尺寸在微波场引发等离子体的过程中起着关键作用。这种从金属丝产生高温等离子体的新颖且简单的方法可能有许多应用，特别是在金属氧化物合成、金属涂层或薄膜沉积方面。
