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Flashover-resistant gradient composite coating layer on aluminum oxide ceramic surface and preparation method of flashover-resistant gradient composite coating layer
The invention discloses a flashover-resistant gradient composite coating layer on an aluminum oxide ceramic surface and a preparation method of the flashover-resistant gradient composite coating layer, and belongs to the field of aluminum oxide ceramic surface composite coating layers. A chromium oxide system with a low secondary electron emission coefficient, a low relative dielectric constant and a low surface resistivity is selected as a flashover-resistant coating layer, a substrate is aluminum oxide ceramic, and an outermost coating layer is a chromium oxide coating layer, so that the content of Cr2O3 is increased layer by layer, and the content of Al2O3 is reduced layer by layer, and the components and electrical properties of the flashover-resistant coating layer are continuously changed; and the relative dielectric constant/surface resistivity of the coating layer is controlled by changing the content of Cr2O3 in the coating layer. The contents of main components of the coating layer change in a gradient manner, deformation caused by thermal stress is reduced while good binding force exists between the coating layer and the substrate, and the coating layer prepared by the method effectively improves the surface flashover resistance of an insulating medium on the basis of ensuring the original good structural strength and pressure resistance of the insulating medium substrate.
本发明公开了一种氧化铝陶瓷表面耐闪络梯度复合涂层及其制备方法，属于氧化铝陶瓷表面复合涂层领域。选用具有低二次电子发射系数、低相对介电常数、低表面电阻率的铬氧化物体系作为耐闪络涂层，由于基体为氧化铝陶瓷，最外层涂层为氧化铬涂层，因此使Cr2O3含量逐层增加，而Al2O3含量逐层减小，使其组分与电学性能呈连续变化，通过改变涂层中Cr2O3的含量来实现对涂层相对介电常数/表面电阻率的控制。各涂层主要成分含量呈梯度变化，涂层与基体之间具有良好结合力的同时，减少了热应力引起的形变，该方法制得的涂层在保证绝缘介质基体原有良好的结构强度与耐压性能的基础上，有效地提高了绝缘介质的耐表面闪络性能。
Flashover-resistant gradient composite coating layer on aluminum oxide ceramic surface and preparation method of flashover-resistant gradient composite coating layer
The invention discloses a flashover-resistant gradient composite coating layer on an aluminum oxide ceramic surface and a preparation method of the flashover-resistant gradient composite coating layer, and belongs to the field of aluminum oxide ceramic surface composite coating layers. A chromium oxide system with a low secondary electron emission coefficient, a low relative dielectric constant and a low surface resistivity is selected as a flashover-resistant coating layer, a substrate is aluminum oxide ceramic, and an outermost coating layer is a chromium oxide coating layer, so that the content of Cr2O3 is increased layer by layer, and the content of Al2O3 is reduced layer by layer, and the components and electrical properties of the flashover-resistant coating layer are continuously changed; and the relative dielectric constant/surface resistivity of the coating layer is controlled by changing the content of Cr2O3 in the coating layer. The contents of main components of the coating layer change in a gradient manner, deformation caused by thermal stress is reduced while good binding force exists between the coating layer and the substrate, and the coating layer prepared by the method effectively improves the surface flashover resistance of an insulating medium on the basis of ensuring the original good structural strength and pressure resistance of the insulating medium substrate.
本发明公开了一种氧化铝陶瓷表面耐闪络梯度复合涂层及其制备方法，属于氧化铝陶瓷表面复合涂层领域。选用具有低二次电子发射系数、低相对介电常数、低表面电阻率的铬氧化物体系作为耐闪络涂层，由于基体为氧化铝陶瓷，最外层涂层为氧化铬涂层，因此使Cr2O3含量逐层增加，而Al2O3含量逐层减小，使其组分与电学性能呈连续变化，通过改变涂层中Cr2O3的含量来实现对涂层相对介电常数/表面电阻率的控制。各涂层主要成分含量呈梯度变化，涂层与基体之间具有良好结合力的同时，减少了热应力引起的形变，该方法制得的涂层在保证绝缘介质基体原有良好的结构强度与耐压性能的基础上，有效地提高了绝缘介质的耐表面闪络性能。
Flashover-resistant gradient composite coating layer on aluminum oxide ceramic surface and preparation method of flashover-resistant gradient composite coating layer
一种氧化铝陶瓷表面耐闪络梯度复合涂层及其制备方法
WANG BO (author) / WANG ZHONGYU (author) / HUANG XIN (author) / ZHOU XIAONAN (author) / WU MULUN (author) / GAO JUNJIE (author) / SHI ZHONGQI (author) / YANG JIANFENG (author)
2022-01-14
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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