纳米SiO_2复合对铝合金表面微弧氧化层生长动力学的影响  

Effects of n-SiO_2 on Growth Dynamics of Alumina Coatings Formed on 7A52 Aluminum Alloy by Micro-arc Oxidation

作　　者：马世宁[1] 索相波[2] 邱骥[1] 朱海燕[1] 

机构地区：[1]装甲兵工程学院装备再制造工程系,北京100072 [2]酒泉卫星发射中心,甘肃酒泉732750

出　　处：《航空材料学报》2012年第1期68-71,共4页Journal of Aeronautical Materials

基　　金："十二五"装备预先研究项目<装备铝合金表面纳米陶瓷化工程应用关键技术研究>

摘　　要：通过在微弧氧化电解液中添加纳米SiO2颗粒配制纳米电解液,在铝合金表面制备了纳米复合微弧氧化层,考察了恒电压和恒电流两种模式下纳米SiO2复合对微弧氧化层生长动力学的影响。结果表明,恒电压模式下,纳米SiO2复合大幅度提高了生长电流和微弧氧化层生长速率;恒电流模式下,纳米SiO2复合提高了微弧氧化层生长速率,电流效率提高。纳米SiO2颗粒在纳米复合微弧氧化层中掺杂,形成杂质能级,并且降低了微弧氧化层材料的禁带宽度,促进了微弧氧化电击穿过程,是纳米SiO2复合促进微弧氧化层生长的主要原因。Al2O3 coatings embedded with SiO2 nanoparticles were produced on 7A52 aluminum alloy by adding SiO2 nanoparticles into the electrolyte.The effect of n-SiO2 on the growth kinetics of the micro-arc oxidized coating under the two modes of constant voltage and constant current was investigated.The results show that nano-SiO2 increased the growth rate of micro-arc oxidized coating and the current efficiency.Nano-SiO2 is formed impurity energy level and narrowed band gap,so that impurity discharge is existed during the breakdown process and promoted the micro-arc oxidation process of electrical breakdown,resulting in the improvement of the growth efficiency of micro-arc oxidized coating.

关 键 词：铝合金 微弧氧化 纳米复合 生长动力学 掺杂 

分 类 号：TG174.45[金属学及工艺—金属表面处理]