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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Investigation of the relationship between arc-anode attachment mode and anode temperature for nickel nanoparticle production by a DC arc discharge
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Investigation of the relationship between arc-anode attachment mode and anode temperature for nickel nanoparticle production by a DC arc discharge

机译：直流电弧放电生产镍纳米粒子的电弧阳极附着方式与阳极温度之间关系的研究

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摘要

Multiple and constricted arc-anode attachment modes were observed in helium arc discharge to prepare nickel nanoparticles. The electron overheating instability resulted in the formation of multiple attachment modes. The effects of hydrogen concentration and shield gas flow rate on the characteristics of nickel nanoparticles were investigated. The evaporation rate of anode material contributed to forming different arc-anode attachments. The surface temperature of the electrode was measured during the arc discharge by two-color pyrometry combined with a high-speed camera which employs appropriate band-pass filters. The relationship between the arc-anode attachment mode and the temperature behavior of the anode surface was investigated by using two synchronized high-speed cameras. The waveform of anode jet area variation with time follows that of the highest temperature variation of anode surface with time. The fluctuation of the highest anode temperature increased when the arc anode attachment changed from multiple into constricted mode. The highest temperature fluctuation and stability of the arc contributed to nanoparticle size distribution. Nickel nanoparticles with large productivity and narrow size distribution were obtained when shield gas was employed by controlling the residence time of nanoparticle growth. The formation mechanism of different arc-anode attachment modes was explained.
机译：在氦弧放电中观察到多种和狭窄的电弧阳极附着方式，以制备镍纳米粒子。电子过热的不稳定性导致形成多种附着模式。研究了氢气浓度和保护气体流速对镍纳米粒子特性的影响。阳极材料的蒸发速率有助于形成不同的电弧阳极附件。在电弧放电过程中，电极的表面温度是通过双色高温测定法与结合了适当带通滤波器的高速照相机相结合而测得的。通过使用两个同步的高速相机研究了弧形阳极附着方式与阳极表面温度行为之间的关系。阳极射流面积随时间变化的波形遵循阳极表面最高温度随时间变化的波形。当电弧阳极附件从多重转变为收缩模式时，最高阳极温度的波动增加。电弧的最高温度波动和稳定性有助于纳米颗粒尺寸分布。通过使用保护气体，通过控制纳米粒子的生长停留时间，可以得到产率高，粒度分布窄的镍纳米粒子。阐述了不同电弧阳极附着方式的形成机理。

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