电极材料表面改性对聚乙烯内空间电荷注入的影响

Effect of Space Charge Injection in PE by Modification of Electrode Surface

采用磁控溅射法在铜片上镀Cr,Mo膜,用扫描电子显微镜(SEM)分析铜片上Cr膜和Mo膜的表面形貌。将镀Cr,镀Mo铜做电极,半导电层与交联聚乙烯(XLPE)样片组合为复合结构。采用电声脉冲法(PEA)测量XLPE内空间电荷分布情况,与铜做电极时聚乙烯内空间电荷比较,发现:电场强度分别为10,30,50kV·mm-1时,铜电极镀Cr改性对抑制空间电荷效果不明显;镀Mo铜做电极时在外部场强为50kV·mm-1时,在阴极附近,注入XLPE样品内部的空间电荷量小于铜做电极时的电荷量。所以镀Mo铜做电极有利于抑制空间电荷注入。

Magnetron sputtering method was utilized to coat the copper with Cr and Mo.The surface topography of the Cr and Mo film on copper was analyzed by scanning electron microscopy（SEM）.Cr-coated copper and Mo-coated copper were used as electrodes,semi conductive layer and the XLPE sample were combined into a composite structure.Space charge injection in XLPE was measured by Pulsed Electro-Acoustic（PEA）.Results show that when the field strength is 10,30,50kV·mm^-1,the copper electrode coated with Mo has little effect on the inhibition of the space charge.However,at 50kV·mm^-1,in the vicinity of the cathode,the space charges within the sample is less than the amount of charge of Cu electrode.To conclude,the injection of space charge from the Mo-plated copper electrode has been restrained.