基于激光诱导击穿光谱的室温硫化硅橡胶材料成分研究

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摘要室温硫化硅（RTV）橡胶涂料因具有优异的防污闪性能,在电力系统得到了广泛应用。热重分析、X射线能谱分析、傅里叶变换红外光谱分析等材料表征手段经常用以表征RTV涂料的成分和长期运行后的老化状态,但上述方法难以在现场进行。为了实现在线检测RTV材料成分,利用激光诱导击穿光谱（LIBS）对RTV材料进行了元素分析。结果表明,对于同种RTV材料,在相同的激光频率特性与单脉冲激光能量条件下,其烧蚀深度与激光脉冲轰击次数呈线性关系,可通过RTV涂料被轰击次数测量涂料厚度;在材料同一位置用LIBS持续轰击,可以对运行退役的RTV材料进行原位分析,不同轰击次数时的等离子体光谱中Fe、Mg等元素的谱线强度从表层到内部会减小,这证明了RTV材料从表面到内部的成分变化,因此可利用LIBS技术检测RTV材料的成分变化来表征RTV材料的老化状态。高灵敏度、可在线的LIBS技术将成为RTV材料运行状态评估的重要手段。

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	王希林
	王晗
	赵晨龙
	陈灿
	贾志东
	周军

关键词 ：高压室温硫化硅橡胶, 涂层厚度, 激光诱导击穿光谱, 线性关系

Abstract：Room temperature vulcanized (RTV) silicone rubber has been widely used in electric power industry of China, due to its good performance in anti-pollution flashover. Thermogravimetric (TG), energydispersive X-ray spectroscopy (EDX), fourier translation infrared spectroscopy (FTIR) are the main methods to analyze RTV coatings. But it is difficult to carry out these methods in the field. In this paper, element composition of RTV materials was analyzed using laser-induced breakdown spectroscopy (LIBS). The results showed that, regarding the same kind of RTV, the relationship between ablation depth of the hole in RTV coatings and the number of laser pulses for breakdown was linear, under the same laser frequency characteristic and the same energy per single laser pulse. Thus, the thickness of coatings can be measured through the bombardment number. Bombarding the same position of the material, in-situ analysis could be carried out on old RTV materials. The spectral line intensity of iron, magnesium and other elements decreased with the number of pulses. It can be used for the detection of the ageing depth of RTV coatings. Hence, the composition change could be acquired. As a high sensitivity and suitability on-line analysis method, LIBS is a new tool for RTV statement access analysis.

Key words： Room temperature vulcanized silicone rubber, thickness of coatings, laser-induced breakdown spectroscopy, linear relationship

收稿日期: 2016-05-20 出版日期: 2017-01-03

PACS:

TM215.92

基金资助:国家自然科学基金（51607101、51477086）和深圳市科技研发资金基础研究项目（JCYJ20160301153442633）资助

作者简介: 王希林男,1983年生,讲师,研究方向为高电压外绝缘及先进复合材料改性等。E-mail: wang.xilin@sz.tsinghua.edu.cn（通信作者）;王晗男,1993年生,硕士研究生,研究方向为基于LIBS的RTV材料检测。E-mail: wanghan0322@126.com

引用本文:

王希林, 王晗, 赵晨龙, 陈灿, 贾志东, 周军. 基于激光诱导击穿光谱的室温硫化硅橡胶材料成分研究[J]. 电工技术学报, 2016, 31(24): 96-104. Wang Xilin, Wang Han, Zhao Chenlong, Chen Can, Jia Zhidong, Zhou Jun. Composition Analysis of Room Temperature Vulcanized Material with Laser-Induced Breakdown Spectroscopy Technique. Transactions of China Electrotechnical Society, 2016, 31(24): 96-104.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2016/V31/I24/96

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