The surface semi - conducting layer is widely used to control the electric field and suppress the surface corona discharge in both hv power cable termination and the end turns of hv generator stator winding 摘要表面半导电层结构可以均匀电场和抑制表面电晕放电，因此被广泛应用于高压电力电缆接头和高压发电机定子线圈端部绝缘中。
When dispersed in water , the electric property of composite particles surface is similar to that of corresponding oxides , while after al2o3 / zro2 - coated , the electric property of graphite surface was similar to that of zro2 复合粉体分散在水中后，表面电性特征与所包覆氧化物类似，双层包覆后复合粉体表面电位特征与最外层包覆物相似。
( 6 ) the study of electroplating ni ~ co coating on silica fiber showed that a special pretreatment must be preformed before electroless nickel because of the smooth surface of silica fiber . ( 7 ) a ni - co coating was acquired by means of eletroless and electroplating ( 6 )石英光纤表面电沉积ni - co合金镀层的研究表明，石英光纤化学性质稳定，表面光滑，化学镀前必须经过特殊的预处理工艺：脱脂，粗化，敏化，活化，烤烘等。
Then by means of heterocoagulation and encapsulatin , on controlled condition the superfine powders of caco3 and tio2 were coated with different nonaparticles ps . the composite particles with core / shell structure were prepared by heating the composite particles above the glass transition temperature of ps 然后根据异相凝集-包埋法原理对具有不同表面电性的微米级的caco _ 3和tio _ 2进行包埋复合，制得以无机粒子为核，有机粒子为壳层的包覆型有机?无机复合粒子。
Compared with untreated graphite under the same condition , the surface electric potential of treated graphite changes in part , but unlike a1 ( oh ) 3 , the oxidation ratio decreases 10 % when a1 ( oh ) 3 / graphite ( wt % ) = 10 , and the wetting angle of treated graphite hold the line , namely the wetting ability is not improved . contrasted with the hydrolyze coating way , the deposition coating way has simple technical process , lower cost , and its disadvantage , for instance , coat layer distributes unevenly , the wetting ability is not improved . furthermore , the effect of treated graphite applied in mgo - c castables are investigated 经沉淀法改性后，石墨的表面电性发生了一定的变化，其等电点从2 3变为7 8 ，但与al ( oh ) _ 3的等电点( 8 9 )存在一定的差异；接触角测定结果则表明，经沉淀法改性后，石墨与水的接触角并没有改变，即改性石墨与水的润湿性没有明显改善；当al ( oh ) _ 3石墨( wt ) = 10时，改性石墨的氧化失重率比未改性石墨下降了约10 ，这说明经沉淀法改性后，石墨的抗氧化性得到了一定的改善。
Treated by hydrolyze coating way , the surface electric potential of graphite moves and iep changes from 2 - 3 to 8 - 9 , reach the one of a1 ( oh ) 3 ; moreover , the wetting angle of treated graphite decreased 10 , and the oxidation ratio decreased 20 % when al ( oh ) 3 / graphite ( wt % ) = 10 , compared with untreated graphite under the same condition . that is to say , the wetting and anti - oxidation ability of graphite is improved , after treated by hydrolyze coating way 经水解法改性后，石墨的表面电性发生改变，其等电点由2 3变为8 9 ，与al ( oh ) _ 3的等电点相近；与未改性石墨相比，改性石墨与水的接触角下降约10 。当al ( oh ) _ 3石墨( wt ) = 10时，水解法改性石墨的氧化失重率比未改性石墨下降了约20 ，因此经水解法改性后，石墨与水的润湿性有所改善，抗氧化性有所提高。
