交流电晕放电下微水对（CF3）2CFCN/N2混合气体分解特性的影响

Influence of moisture on （CF3）2CFCN/N2 decomposition characteristics under AC corona discharge

全氟异丁腈(CF3)2CFCN(C4F7N)作为SF6替代气体引起了研究人员的广泛关注。为研究微水对C4F7N的分解特性的影响,本文实施了针对C4F7N/N2混合气体的针-板电极交流电晕放电实验,随后利用气相色谱质谱联用仪和扫描式电子显微镜-能量色谱仪分析了C4F7N/N2在微水条件下的分解特性。结果显示,C4F7N/N2的主要分解气体为CO2、CF4、C2F6、C3F6和C3F8等。随着微水含量的升高,CO2产量增加并逐渐趋于饱和;CF4、C2F6和(C3F6+C3F8)等氟碳气体的产量先下降后上升;分解气体总量呈缓慢持续增长的趋势。放电后,铜板电极表面出现了沉积物,电镜扫描显示沉积物的主要元素构成为C、N、F等;当微水含量进一步增加时,铜板电极表面出现了Fe和Cr元素。

(CF3)2CFCN(C4F7N)has attracted wide attention as an alternative to SF6.In order to study the effects of trace water on the discharge decomposition characteristics of C4F7N,AC corona discharge experiments for C4F7N/N2 are conducted.Subsequently,the decomposition gas by-products of C4F7N/N2 are detected by GC/MS qualitatively and quantitatively,and the elemental composition on the surface of the copper plain electrode is analyzed by SEM-EDS.The results show that the main gas by-products are CO2,CF4,C2F6,C3F6 and C3F8.With the increase of trace water content,the concentration of CO2 increases and gradually becomes saturated,while the concentrations of CF4,C2F6 and(C3F6+C3F8)drop first and then rise.In addition,the total amount of gas by-products shows a tardy growth trend.Meanwhile,after discharge,the introduction of trace water causes carbon deposits to appear on the surface of the copper plain electrode,which are mainly composed of C,N,F elements.As the trace water content is further increased,Fe and Cr elements appeares on the surface of the copper plain electrode.