【摘要】 固体绝缘材料的表面特性极大地影响着其真空沿面闪络特性,长期以来这一现象极大地制约着真空绝缘系统的整体性能,限制了高压电真空设备的发展进程。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,在不明显降低可加工性能的前提下,通过在可加工陶瓷原材料内掺杂不同的低二次电子发射系数金属氧化物Cu2O以及Cr2O3,研究掺杂之后材料的二次电子发射系数的变化,对不同掺杂工艺下试品的沿面闪络电压进行研究。结果发现:掺杂低二次电子发射系数金属氧化物能够相应降低可加工陶瓷材料的二次电子发射系数,通过研究不同加工工艺条件下材料的闪络电压,发现试样的闪络电压随其二次电子发射系数的降低而提高。更多还原

【Abstract】 Secondary electron emission(SEE) yield is one important factor for the flashover phenomena of solid materials under high electric field in vacuum.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,different low SEE yield metal oxides including Cu2O and Cr2O3 are doped into the original glass ceramics while keeping its machinable performance,to investigate the effects of different process technology on the surface flashover phenomena of the machinable ceramics under pulse voltage in vacuum.The experimental results indicate that after the metal oxide doped into the original material the SEE yield of the sample reduced.By investigating the different samples’ flashover voltage it can be seen that with the sample’s SEE yield reducing the sample’s vacuum flashover voltage increasing.更多还原