表面处理对可加工陶瓷真空沿面闪络特性的影响

摘要

长期以来真空沿面闪络现象严重制约着电真空绝缘系统的整体性能，限制了高压电真空设备的发展，而绝缘材料的表面状况对其沿面耐电特性有极大影响。本文针对一种具有良好加工性能及表面耐电特性的低熔点可加工微晶玻璃陶瓷引入真空绝缘的背景，通过使用不同的砂纸对可加工陶瓷试品的表面进行打磨处理，使用超深度表面形态测定激光显微镜测定不同处理方式下试品表面形貌的变化，并对不同处理情况下的试品的真空沿面闪络特性进行测定。结果发现：使用砂纸打磨的方法能够有效改变试品的表面粗糙度，粗糙度变化规律明显，而随着试品表面粗糙度的增大，试品的真空沿面闪络电压提高。%Surface flashover phenomena in vacuum restrict the overall performance of insulation system, which seriously limits the development of high voltage electro-vacuum devices. On the basis of the novel low melting temperature machinable glass ceramics for vacuum insulation system, which has excellent machinable performance and good electrical properties, the different types of sandpaper are used in this paper to treat on the sample surface. The surface pattern and the surface roughness of the machinable ceramic samples have been measured by a confocal laser microscope, and the flashover characteristics of the samples in vacuum have been measured in this paper. The results indicated that, the sandpaper treatment can change the surface roughness of samples effectively, with the increasing of the surface roughness, the flashover voltage of the machinable sample increased gradually.