Enhanced surface performance of insulating ceramic by plasma polymerization with nanosecond-pulse dielectric barrier discharge: Insight into the effect of the repetition frequency

材料科学 纳秒 介质阻挡放电 陶瓷 重复(修辞手法) 脉冲重复频率 等离子体 脉搏(音乐) 电介质 光电子学 光学 复合材料 激光器 物理 电信 计算机科学 语言学 哲学 雷达 量子力学 探测器
作者
Xinglei Cui,Lan-Fen Li,Zhenbo Xu,Xi Zhu,Shakeel Akram,Zhi Fang
出处
期刊:Journal of vacuum science & technology [American Vacuum Society]
卷期号:42 (4)
标识
DOI:10.1116/6.0003519
摘要

Insulating ceramics are widely used in power systems, but their high polarity makes them prone to wet and pollution flashover. In this paper, an Ar/polydimethylsiloxane dielectric barrier discharge excited by a parametric nanosecond-pulse power source is utilized for plasma polymerization to enhance ceramic surface insulating performance. Diagnosis of the discharge characteristics and surface physiochemical properties is conducted at different repetition frequencies to investigate the mechanism associated with the relationship between repetition frequency and the plasma polymerization process. The results indicate that a superhydrophobic surface can be achieved at repetition frequencies above 2 kHz. This transformation brings about multiple effects, including a decrease in surface polarity, an increase in charge dissipation, and an improvement in surface dry and wet flashover voltages. It is discovered that the discharge mode shifts from homogeneous to filamentary due to the memory effect of high repetition frequencies. Additionally, several filaments are generated simultaneously during a single pulse, facilitating the polymerization reactions. For high repetition frequencies, a low-polarity silicon-containing film with micro-nanometer structures is deposited on the ceramic surface, while scattered polymer fragments are generated on the surface without a cross-linked film for repetition frequencies below 2 kHz, despite longer treatment durations.
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