摘要
目的采用两步法在铝合金表面制备MoS_(2)/MAO耐磨减摩复合涂层,并考察其摩擦磨损行为特点。方法通过微弧氧化(MAO)技术和原位水热法在7075铝合金表面构筑MoS_(2)/MAO耐磨减摩复合涂层,通过扫描电子显微镜(SEM)、X射线衍射仪(XRD)和Raman光谱对膜层的微观形貌和组成进行表征。利用摩擦试验机测试试样的摩擦性能,并通过三维轮廓仪分析磨痕形貌。结果MAO膜层主要由Al_(2)O_(3)构成,含有少量SiO_(2),表面为典型的多孔结构,存在大量微孔,粗糙度较大。MoS_(2)/MAO耐磨减摩复合涂层中的MoS_(2)颗粒较均匀地填充在MAO微孔中,并覆盖在凹陷内,使得表面平整光滑而致密。摩擦测试结果表明,MAO涂层能够提高基体的承载能力,但其摩擦因数较大,波动较大。MoS_(2)膜层为MAO提供了良好的润滑改性作用,使其摩擦因数减小。结论MoS_(2)/MAO耐磨减摩复合涂层能够显著提高基体的摩擦磨损性能。在低载荷下,MAO硬质涂层起着很好的承载作用,MoS_(2)颗粒层起着润滑减磨作用,使摩擦因数始终较低且平稳;在高载荷下,MAO层表面的微凸体在应力作用下破碎,硬质磨粒和MoS_(2)颗粒分布在磨损面,部分被挤出磨痕区,导致摩擦因数不断增大。
The work aims to fabricate MoS_(2)/MAO wear-resistant and anti-friction composite coatings on Al alloy surface by two-step method,and investigate the friction and wear behavior characteristics.The first step was to prepare a MAO coating on the surface of 7075 Al alloy by micro-arc oxidation(MAO)technique.The second step was to construct the MoS_(2)/MAO wear-resistant and anti-friction composite coating on MAO coating by in-situ hydrothermal synthesis method.The micro-structure and composition of the coatings were characterized by Scanning Electron Microscope(SEM),X-ray Diffraction Spectrometer(XRD)and Raman spectrum.The wear resistance was measured with friction tester,and the wear scars were analyzed with 3D surface profiler.The characterization results showed that the MAO coating was mainly composed of Al_(2)O_(3),accompanied by a small amount of SiO_(2).The surface was a typical porous structure with a large number of micropores and a large surface roughness.However,after the formation of MoS_(2)/MAO composite coating,the number of micropores on the surface of the coating significantly decreased.MoS_(2)uniformly covered the concave areas of the ceramic coating in the form of particles and filled them into the micropores of the MAO coating,making the surface flat and smooth,and significantly improving the compactness.The friction test results showed that there were many volcanic micropores on the surface of the MAO coating,which were uneven and rough,resulting in a large fluctuation of the friction coefficient during the friction process.It took a long time to run in order to achieve a stable friction coefficient of 0.6.When the MoS_(2)/MAO composite coating was formed,the friction coefficient was significantly reduced,with an average friction coefficient of around 0.25,and the friction curve became more stable.At the same speed,different loads had a great effect on the friction coefficient,which varied from 0.14 to 0.4.The friction coefficient was the lowest under 4 N load,and the average friction coefficient
作者
刘秀芳
罗鑫
齐玉明
崔学军
曾山山
眭剑
LIU Xiufang;LUO Xin;QI Yuming;CUI Xuejun;ZENG Shanshan;SUI Jian(School of Materials Science and Engineering,Sichuan University of Science&Engineering,Sichuan Zigong 643000,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2024年第11期90-99,共10页
Surface Technology
基金
钒钛资源综合利用四川省重点实验室科研项目(2022FTSZ13)
四川轻化工大学科研创新团队计划(SUSE652A015)
大学生创新创业训练计划(cx2022002,S20221062202)。
关键词
微弧氧化
二硫化钼
耐磨
减摩
复合涂层
磨损机理
micro arc oxidation
MoS_(2)
wear-resistant
anti-friction
composite coating
wear mechanism
