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首页> 外文期刊>Physica, C. Superconductivity and its applications >High voltage breakdown studies of sol-gel MgO-ZrO2 insulation coatings under various pressures at 298 K and 77 K
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High voltage breakdown studies of sol-gel MgO-ZrO2 insulation coatings under various pressures at 298 K and 77 K

机译：溶胶-凝胶MgO-ZrO2绝缘涂层在298 K和77 K的各种压力下的高压击穿研究

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摘要

High voltage breakdown (HVbd) tests were performed to investigate electrical properties of high temperature MgO-ZrO2 insulation coatings on long-length stainless steel (SS) tapes under various pressures at room temperature (298 K) and liquid nitrogen temperature (77 K) for applications of HTS/LTS coils and magnets. After solutions were prepared from Mg and Zr based precursors, solvent and chelating agent, the coating were fabricated on SS substrates using reel-to-reel sol-gel technique: Coating thicknesses for 4, 8, and 9 clippings were about 7, 12, and 13 mu m, respectively, and thickness of epoxy-impregnated samples (stycast 2850 FT/24 LV) were measured to be 32 pm. The pressure from 0 GPa to 0.54 GPa was applied on to test couples, the stycast thicknesses between the layers were varied 32-20 mu m. Thickness of the coatings and epoxy-impregnated using stycast were determined by using environmental scanning electron microscopy (ESEM), The resistance, capacitance, and HVbd of the samples were measured by using standard machines HP 439 a high resistance meter, 161 analog digital capacitance meter and model 200-02R high voltage power supply, respectively. Electric strength and dielectric constant were calculated at 298 and 77 K under various pressures. The high HVbd, and electric strength values of the samples were 2.84 kV and 45.91 kV/mm, respectively. ESEM observation revealed that arcing spots in the insulation coatings become larger and deeper for higher HVbd's. (c) 2005 Elsevier B.V. All rights reserved.
机译：进行了高压击穿（HVbd）测试，以研究在室温（298 K）和液氮温度（77 K）下在各种压力下长条不锈钢（SS）胶带上的高温MgO-ZrO2绝缘涂层的电性能。 HTS / LTS线圈和磁体的应用。从基于Mg和Zr的前驱物，溶剂和螯合剂制备溶液后，使用卷对卷溶胶凝胶技术在SS基板上制备涂层：4、8和9屑的涂层厚度约为7、12环氧树脂浸渍的样品（2850 FT / 24 LV铸模）的厚度分别为13μm和32 pm。将0 GPa至0.54 GPa的压力施加到测试对上，各层之间的探管厚度变化为32-20微米。使用环境扫描电子显微镜（ESEM）确定涂层的厚度和使用Stycast进行环氧树脂浸渍。使用标准机HP 439（高电阻计，161模拟数字电容计）测量样品的电阻，电容和HVbd和200-02R型高压电源。在各种压力下，在298和77 K下计算出电强度和介电常数。样品的高HVbd和电气强度分别为2.84 kV和45.91 kV / mm。 ESEM观察表明，对于较高的HVbd，绝缘涂层中的电弧点变得越来越大和越来越深。 （c）2005 Elsevier B.V.保留所有权利。

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