硅酸钠浓度对Ti3Al基合金微弧氧化层生长及其摩擦磨损性能的影响  

Effect of Na2SiO3 Concentration on Growth and Friction and Wear Properties of Micro-arc Oxide Coatings on Ti3Al-based Alloys

作　　者：贾文婷 王文波[1] 田林海[2] 王晓云 常勇强 张伟樯 聂勇[1] JIA Wen-ting;WANG Wen-bo;TIAN Lin-hai;WANG Xiao-yun;CHANG Yong-qiang;ZHANG Wei-qiang;NIE Yong(School of Mechanical Engineering and Transportation,Taiyuan University of Technology,Taiyuan 030024,China;Research Institute of Surface Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学机械工程与运载学院学院,太原030024 [2]太原理工大学表面工程研究所,太原030024

出　　处：《表面技术》2019年第7期104-111,共8页Surface Technology

基　　金：山西省自然基金项目(201801D121098);山西省回国留学人员科研资助项目(2016-025)~~

摘　　要：目的研究硅酸钠溶液浓度对Ti3Al基合金表面制备微弧氧化膜层结构的影响,以提高Ti3Al基合金微弧氧化膜层的摩擦磨损性能。方法采用恒流模式微弧氧化电源,分别在6、8、10g/L的Na2SiO3电解液中,对Ti3Al基合金试样进行微弧氧化处理,用扫描电子显微镜(SEM)、能谱仪(EDS)、ImageJ软件、X射线衍射仪(XRD)及显微硬度仪,分析微弧氧化膜层的表面形貌和截面形貌、元素分布、厚度、相组成以及表面硬度。用CFT-I型磨损试验机研究不同微弧氧化膜层的摩擦磨损性能。结果随着Na2SiO3浓度的增加,微弧氧化的工作电压与起弧电压均逐渐减小。微弧氧化层表面呈多孔状,存在熔融物堆积导致的环状凸起。随着Na2SiO3浓度的增加,氧化层表面微孔直径减小,膜层逐渐增厚。微弧氧化膜层主要Al2O3、SiO2、TiO2、Nb2O5以及Al2SiO5相组成,微弧氧化处理明显降低了Ti3Al基合金的摩擦系数和磨损率。电解液Na2SiO3质量浓度为10g/L时,微弧氧化膜层的平均摩擦系数为0.49,磨损率仅为2.1×10^-7mm^3/(N·mm),主要表现为微切削磨损与轻微的粘着磨损。结论随着硅酸钠浓度的增加,有利于提高微弧氧化膜层的形成速率,缩短反应时间。微弧氧化处理能够显著改善Ti3Al基合金的耐磨性。The work aims to study effects of Na2SiO3 concentration on microstructure of micro-arc oxide (MAO) coatings on Ti3Al-based alloys and improve friction and wear properties of MAO coatings.Micro-arc oxidation coating was formed on Ti3Al-based alloy surface in Na2SiO3 electrolyte of 6 g/L,8 g/L and 10 g/L concentration with constant current MAO power supply.The surface and cross-section morphology,element composition,thickness,phase structure and surface hardness of MAO coatings were investigated by SEM,EDS,Image J,XRD and micro hardness tester.Friction and wear properties of different micro-arc oxidation ceramic coatings were studied by CFT-I wear tester.With the increase of Na2SiO3 concentration, working voltages and striking voltages of MAO were reduced.The surface of the MAO coatings was porous,and there was an annular protrusion caused by the accumulation of the melt.With the increase of the concentration of Na2SiO3,the diameter of the micro pores on the surface of the MAO coatings was reduced,and the MAO coatings were gradually thickened.MAO coatings were mainly composed of Al2O3,SiO2,TiO2,Nb2O5 and Al2SiO5.The friction coefficient and wear rate of the coatings were decreased by MAO treatment.When the concentration of electrolyte was 10 g/L,the average friction coefficient was 0.49 and the wear rate was only 2.1×10^-7 mm^3/(N·mm).The wear mechanisms were dominated by micro cutting wear,along with some adhesive wear.With the increase of Na2SiO3 concentration,the formation rate of MAO coating is increased and the reaction time is shortened.The wear resistance of Ti3Al-based alloy can be significantly improved by micro-arc oxidation treatment.

关 键 词：TI3AL基合金 微弧氧化 摩擦磨损 微弧氧化层 硅酸钠 电压 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TH117.1[金属学及工艺—金属学]