TC4合金表面微弧氧化原位生长自润滑MoS2/TiO2膜层研究  

Study on Self-lubricating MoS2/TiO2 Coating Synthesized on TC4 Surface by Micro-arc Oxidation

作　　者：杨泽慧 王楠[1] 陈永楠[1] 张龙 陈宏[1] 郝健民 赵永庆[2] 史晨星 史文龙 Yang Zehui;Wang Nan;Chen Yongnan;Zhang Long;Chen Hong;Hao Jianmin;Zhao Yongqing;Shi Chenxing;Shi Wenlong(School of Materials Science and Engineering,Chang'an University,Xi'an 710064,China;Northwest Institute for Nonferrous Metal Research,Xi'an 710016,China)

机构地区：[1]长安大学材料科学与工程学院,陕西西安710064 [2]西北有色金属研究院,陕西西安710016

出　　处：《稀有金属材料与工程》2020年第9期3195-3202,共8页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51471136);陕西省自然科学基金重点项目(2019JZ-27);陕西省陕煤联合基金项目(2019JLM-47);凝固技术国家重点实验室开放课题(SKLSP201750);中央高校基本科研业务费专项资金(300102319304,300102318101)。

摘　　要：钛合金表面减摩涂层的设计和制备是提升钛合金构件耐磨性能、保障服役安全的重要技术之一。针对于目前钛合金减摩涂层中减摩剂分散不均匀,易于团聚导致膜基结合力差等问题,本研究采用一步微弧氧化技术在TC4合金表面原位生长纳米MoS2颗粒,制备具有减磨作用的MoS2/TiO2复合陶瓷膜层;讨论了原位反应中硫源添加量对膜层微观结构及耐磨性能的影响。结果表明:以Na2S和Na2MoO4分别为硫源和钼源在TC4合金表面通过微弧氧化制备出了MoS2/TiO2复合陶瓷膜层;通过控制Na2S浓度可以原位生成具有小尺寸、均匀化分布的纳米MoS2颗粒,并实现对MoS2含量和形态的调控。随着Na2S浓度的增加,膜层结构逐渐致密化且表面粗糙度较低,当添加量到达60 g/L时,由于硫沉淀作用导致膜层开始疏松,粗糙度增加。由于膜层表面和内部均存在均匀化分布且具有自润滑作用的MoS2颗粒,所得膜层耐磨性较传统微弧氧化膜层或直接添加MoS2颗粒所得膜层分别提高了395.4%、129.4%;同时,膜基结合力较传统微弧氧化提高了87.1%,达到了723.8 N,说明了该技术在保证良好的自润滑效果同时改善了膜基结合力。该研究结果可以为钛合金耐磨涂层设计和制备提供新思路和研究方法。The design and preparation of antifriction coating on titanium alloy surface is one of the important technologies to improve the wear resistance of titanium alloy components and ensure the safety in service.In order to solve the problems of uneven dispersion of antifriction agents and poor adhesion of coating caused by easy agglomeration in titanium alloy antifriction coating,this paper adopts one-step micro-arc oxidation technology to in situ synthesize MoS2/TiO2 composite ceramic coating with anti-wear effect on the surface of titanium alloy.The effects of sulfur source concentration on microstructure and wear resistance of the coating was discussed.The results show that MoS2/TiO2 composite ceramic film has been successfully prepared by micro-arc oxidation with Na2 S and Na2 MoO4 as sulfur source and molybdenum source,respectively.By controlling Na2 S concentration,nano-MoS2 particles with small size and uniform distribution can be generated in situ,and the content and morphology of MoS2 can be regulated.With the increase of Na2 S concentration,the coating becomes compact and the roughness decreases.When the addition amount reaches 60 g/L,the coating turns into loose due to sulfur precipitation and the roughness increases.Due to the uniform distribution of MoS2 particles on the surface and inside of the coating,the abrasion resistance of the obtained coating is improved by 395.4%and 129.4%compared with the conventional micro-arc oxidation coating and the coating prepared by directly adding MoS2 particles into the electrolyte,respectively.At the same time,adhesion(reaching 723.8 N)increases by 87.1%compared with that of the traditional micro-arc oxidation,indicating that this technology not only guarantees good self-lubrication effect,but also improves adhesion of the coating and matrix.The results can provide new ideas and research methods for the design and preparation of titanium alloy wear-resistant coatings.

关 键 词：TC4 微弧氧化 MOS2 原位合成 摩擦磨损 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TG174.4[金属学及工艺—金属材料]