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A meter-scale wide indirect dielectric barrier discharge (DBD) for treating large-scale and irregular-shaped materials is reported in this study. The structure of the modular-graded gas path is designed, and the influence of gas hole density on the flow field is simulated. It is confirmed that 8 subdividing (40 holes uniformly distributed) structure can effectively improve the uniformity of the gas flow rate distribution in the discharge area and on the treated material surface compared with 0 subdividing structure. Based on this structure, Ar is employed as the discharge gas and hexamethyldisilane as the precursor to generate meter-scale wide plasma under the excitation of a nanosecond pulsed power supply. Particle activity, discharge uniformity and stability under different operating parameters are evaluated by measuring voltage-current waveforms, emission spectra, luminescence images and temperatures at different electrode positions. The treatment effect and uniformity are verified by measuring the water contact angle (WCA) of epoxy (EP) material. The results show that a uniform and stable plasma with a width of 1120 mm is generated under suitable operating parameters. By increasing the voltage amplitude, both the discharge intensity and particle activity are improved, while the discharge uniformity and stability are significantly reduced. By increasing the discharge gas flow rate, the particle activity, discharge uniformity, and stability can be improved simultaneously but slightly. The WCA on the EP surface is uniformly increased from 67° to 144° with a variation of less than 6% after 10-min treatment at a voltage amplitude of 12 kV and a discharge gas flow rate of 10 L/min. The meter-scale wide indirect DBD electrode in this work can provide reference and basis for the industrial application of large-scale plasma material modification technology.
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Keywords:
- meter-scale wide electrode /
- indirect dielectric barrier discharge /
- material modification /
- discharge characteristics /
- water contact angle
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图 1 米量级宽幅间接DBD电极结构设计 (a) 电极示意图; (b) 电极实物图
Figure 1. Structural design of the meter-scale wide indirect DBD: (a) Schematic diagram; (b) photo of the electrode.
图 2 米量级宽幅间接DBD电极流场仿真 (a) 不同结构下工作气体流速的流线; (b), (c) 不同结构下处理材料表面流速分布; (d) 不同工作气体流速下的放电区域和材料表面流速分布
Figure 2. Flow field simulation of the meter-scale wide indirect DBD: (a) Ar flow streamlines of gas flow rate under different structures; (b), (c) flow rate distributions on the treated material surface for different structures; (d) flow rate distributions in the discharge region and on the material surface for different total gas flow rates.
图 3 实验平台示意图
Figure 3. Schematic diagram of the experiment platform.
图 4 典型电压电流波形
Figure 4. Typical voltage-current waveforms.
图 5 不同条件下的电流幅值均值和标准差 (a) 不同电压幅值; (b) 工作气体流速
Figure 5. Mean value and standard deviation of current amplitude under various conditions: (a) Voltage amplitude; (b) gas flow rates.
图 6 典型放电的发光图像
Figure 6. Luminescence image of typical discharge.
图 7 不同电压幅值和工作气体流速下的DBD放电图像
Figure 7. Discharge images of DBD at different voltage amplitudes and gas flow rates.
图 8 典型发射光谱
Figure 8. Typical emission spectra.
图 9 放电区域内电场分布
Figure 9. Electric field in the discharge area.
图 10 不同条件下的Ar(763.51)光谱强度 (a) 电压幅值; (b) 工作气体流速
Figure 10. Ar(763.51) intensity under different conditions: (a) Voltage amplitude; (b) gas flow rate.
图 11 不同放电时间下不同位置的温度 (a) 2 min; (b) 10 min; (c) 温升曲线
Figure 11. Temperatures at different positions for different discharge durations: (a) 2 min; (b) 10 min; (c) electrode temperature rise.
图 12 不同条件下电极温度 (a) 电压幅值; (b) 工作气体流速
Figure 12. Electrode temperatures under different conditions: (a) Voltage amplitude; (b) gas flow rates.
图 13 不同条件下改性后WCA变化 (a) 不同位置; (b) 不同电压幅值; (c) 不同工作气体流速; (d) WCA与电流幅值; (e) WCA标准差与GVSD
Figure 13. WCA under different conditions: (a) Different positions; (a) voltage amplitude; (b) gas flow rates; (d) WCA and current amplitude; (e) WCA standard deviation and GVSD.
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