纳米TiO2对D16T铝合金微弧氧化膜耐磨性的影响及机理  

Effect and Mechanism of Nano-TiO2 on Wear Resistance of Micro-arc Oxidation Film on D16T Aluminium Alloy

作　　者：刘婉颖[1,2] 邱宇洪 刘颖[3] 林元华[1] 石云升 Mohd Talha 高婷艳 LIU Wan-ying;QIU Yu-hong;LIU Ying;LIN Yuan-hua;SHI Yun-sheng;Mohd Talha;GAO Ting-yan(School of Materials Science and Engineering,Southwest Petroleum University,Chengdu 610500,China;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China;School of MaterialsScience and Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]西南石油大学材料科学与工程学院,成都610500 [2]西南石油大学油气藏地质及开发工程国家重点实验室,成都610500 [3]四川大学材料科学与工程学院,成都610065

出　　处：《表面技术》2019年第10期180-189,共10页Surface Technology

基　　金：国家自然基金项目(51274170);西南石油大学十八期大学生重点开放实验项目(KSZ18503);西南石油大学青年教师过关计划项目(201131010056)~~

摘　　要：目的提高D16T铝合金的耐磨损性能。方法通过向硅酸盐和磷酸盐混合电解液体系中添加2 g/L纳米TiO2添加剂,利用微弧氧化技术在其表面制备微弧氧化陶瓷膜。采用X射线衍射仪(XRD)、扫描电镜(SEM)、能谱分析仪(EDS)、显微硬度计、厚度测试仪、摩擦磨损试验机等,研究了纳米TiO2添加剂对D16T铝合金微弧氧化膜的结构和耐磨损性能的影响及机理。结果纳米TiO2的添加使得微弧氧化膜层的表面变得更加平整、致密,具有更少的微孔和裂纹,大大改善了膜层结构。相比于未添加纳米TiO2的电解液中制得的微弧氧化膜,在含纳米TiO2的电解液中所制得的微弧氧化膜中有新相TiO2生成,并且促使更多的α-Al2O3相和γ-Al2O3相生成,使膜层厚度得到明显增加,膜厚达31.2μm,显微硬度也得到显著提高,达510HV。纳米TiO2的添加,降低了D16T微弧氧化膜层试样的摩擦系数,平均摩擦系数为0.45,明显低于不含纳米TiO2的D16T微弧氧化膜层试样的摩擦系数(0.75)。结论加入到电解液中的纳米TiO2在微弧氧化反应过程中已进入到所形成的氧化膜层,并且填充了膜层中的微孔和裂纹,改善了膜层结构,增加了膜层厚度,显著提高了微弧氧化膜层的显微硬度和耐磨损性能。The work aims to improve the wear resistance of D16T aluminum alloy.A micro-arc oxidation ceramic coating was produced on the surface of D16T aluminum alloy with the micro-arc oxidation technique by adding 2 g/L nano-TiO2 additive to the mixed electrolyte system of silicate and phosphate.The effect and mechanism of nano-TiO2 additive on the structure and wear resistance of the coatings formed on D16T aluminum alloy were investigated by X-ray diffractometry(XRD),scanning electron microscopy(SEM),energy spectrum analyzer(EDS),microhardness tester,thickness tester and friction and wear tester.The surface of micro-arc oxide coating became more smooth and denser and had fewer micropores and cracks due to nano-TiO2,thus greatly improving the coating structure.Compared to the micro-arc oxidation coating prepared in the electrolyte without nano-TiO2,the new phase TiO2 was formed in the micro-arc oxidation coating prepared in the electrolyte containing nano-TiO2,and moreα-Al2O3 andγ-Al2O3 phases were formed.Therefore,the thickness of the coating with nano-TiO2 was obviously increased and up to 31.2μm,and the microhardness was also significantly improved to 510HV.The friction coefficient of D16T micro-arc oxidation coating was reduced and the average friction coefficient was 0.45 which was smaller than 0.75 of the coating without nano-TiO2.The nano-TiO2 added to the electrolyte has entered the formed oxidation coating during micro-arc oxidation reaction and filled the micropores and cracks in the coating.Therefore,the coating structure is improved and the coating thickness is increased,which significantly improves the microhardness and wear resistance of micro-arc oxidation coating.

关 键 词：纳米TIO2 微弧氧化 D16T铝合金 摩擦系数 显微硬度 耐磨性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]