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 經(jīng)沉淀法改性后,石墨的表面電性發(fā)生了一定的變化,其等電點(diǎn)從2 3變?yōu)? 8 ,但與al ( oh ) _ 3的等電點(diǎn)( 8 9 )存在一定的差異;接觸角測(cè)定結(jié)果則表明,經(jīng)沉淀法改性后,石墨與水的接觸角并沒(méi)有改變,即改性石墨與水的潤(rùn)濕性沒(méi)有明顯改善;當(dāng)al ( oh ) _ 3石墨( wt ) = 10時(shí),改性石墨的氧化失重率比未改性石墨下降了約10 ,這說(shuō)明經(jīng)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 經(jīng)水解法改性后,石墨的表面電性發(fā)生改變,其等電點(diǎn)由2 3變?yōu)? 9 ,與al ( oh ) _ 3的等電點(diǎn)相近;與未改性石墨相比,改性石墨與水的接觸角下降約10 。當(dāng)al ( oh ) _ 3石墨( wt ) = 10時(shí),水解法改性石墨的氧化失重率比未改性石墨下降了約20 ,因此經(jīng)水解法改性后,石墨與水的潤(rùn)濕性有所改善,抗氧化性有所提高。