Study on the Sealing Treatment and Dielectric Properties of Al<sub>2</sub>O<sub>3</sub> Insulating Coatings

doi:10.1007/s11666-025-01948-y

IMR OpenIR

	Study on the Sealing Treatment and Dielectric Properties of Al₂O₃ Insulating Coatings
	Han, Botao 1,2; Tariq, Naeem ul Haq 3; Wang, Jiqiang 1; Xiong, Tianying 1; Li, Ning 1; Cui, Xinyu 1
通讯作者	Xiong, Tianying(tyxiong@imr.ac.cn)
	2025-03-13
发表期刊	JOURNAL OF THERMAL SPRAY TECHNOLOGY
ISSN	1059-9630
页码	17
摘要	The sealing treatment of plasma-sprayed Al2O3 insulating coatings and its effect on the microstructure and dielectric properties were systematically investigated. To compare the penetration depth of sealants, various sealing processes were employed, utilizing two types of sealants and under two different ambient pressures. The microstructure of coatings was analyzed using scanning electron microscopy, energy dispersive spectrometer, and isothermal adsorption/desorption tests. Breakdown strength, resistivity, dielectric constant (epsilon(r)), loss tangent (tan delta), and complex impedance were measured for both unsealed and sealed coatings. The results indicated that the maximum penetration depth percentage (50.8%) was achieved with the diluted sealant under low ambient pressure (20 Pa). A penetration model, that includes the ambient pressures, pore diameters, and physical properties of the sealant, was proposed and validated. The sealing treatment nearly doubled the breakdown strengths of coatings under DC, 50 Hz, and 500 Hz voltages and increased resistivity by nearly 100 times in environments with varying relative humidity (RH) levels. Additionally, the sealing treatment decreased the epsilon(r) and tan delta of coatings in a 20% RH environment and increased their impedance in both 20% RH and 80% RH environments. This study provides a theoretical basis for the design and application of sealing treatments.
关键词	Al2O3 insulating coating dielectric properties penetration model plasma spraying sealing treatment
资助者	National Key Research and Development Program of China
DOI	10.1007/s11666-025-01948-y
收录类别	SCI
语种	英语
资助项目	National Key Research and Development Program of China[2020YFB2007803]
WOS研究方向	Materials Science
WOS类目	Materials Science, Coatings & Films
WOS记录号	WOS:001444345100001
出版者	SPRINGER
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/192003
专题	中国科学院金属研究所
通讯作者	Xiong, Tianying
作者单位	1.Chinese Acad Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China 3.Pakistan Inst Engn & Appl Sci, Dept Met & Mat Engn, Islamabad 45650, Pakistan
推荐引用方式 GB/T 7714	Han, Botao,Tariq, Naeem ul Haq,Wang, Jiqiang,et al. Study on the Sealing Treatment and Dielectric Properties of Al₂O₃ Insulating Coatings[J]. JOURNAL OF THERMAL SPRAY TECHNOLOGY,2025:17.
APA	Han, Botao,Tariq, Naeem ul Haq,Wang, Jiqiang,Xiong, Tianying,Li, Ning,&Cui, Xinyu.(2025).Study on the Sealing Treatment and Dielectric Properties of Al₂O₃ Insulating Coatings.JOURNAL OF THERMAL SPRAY TECHNOLOGY,17.
MLA	Han, Botao,et al."Study on the Sealing Treatment and Dielectric Properties of Al₂O₃ Insulating Coatings".JOURNAL OF THERMAL SPRAY TECHNOLOGY (2025):17.