聚硅氮烷/MoS_(2)高温自润滑涂层的制备及性能研究  

Preparation and Properties of Polysilazane/MoS_(2) High Temperature Self-Lubricating Coatings

作　　者：李谋吉 杨武芳[1] 汤洁 马正峰 王睿 麻拴红 于波[1] 周峰[1] LI Mouji;YANG Wufang;TANG Jie;MA Zhengfeng;WANG Rui;MA Shuanhong;YU Bo;ZHOU Feng(State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Gansu Lanzhou 730000,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院兰州化学物理研究所固体润滑国家重点实验室,甘肃兰州730000 [2]中国科学院大学,北京100049

出　　处：《摩擦学学报（中英文）》2024年第6期752-762,共11页Tribology

基　　金：中国科学院战略性先导科技专项(XDB0470302);甘肃省科技计划基础研究创新群体项目(22JR5RA093)资助。

摘　　要：高温固体自润滑涂层因具有优异的摩擦学性能和极好的附着力,已被广泛应用于航空、航天等领域.本文中采用陶瓷前驱体聚硅氮烷为粘接剂,MoS_(2)为润滑填料制备了1种新型的宽温域减摩抗磨涂层.系统探究了各因素对涂层摩擦学性能的影响,并利用扫描电镜(SEM)、X射线衍射(XRD)和Raman等表征分析涂层的微观组织、物相组成及磨损机理.结果表明:聚硅氮烷/MoS_(2)涂层不仅和基底结合力强,且在25~300℃较宽温域范围内具有优异的减摩抗磨性能.其中300℃热处理的涂层在200℃、9 N及90 r/min的测试条件下具有最佳润滑性能:平均摩擦系数为0.05,磨损率为7.6×10^(-5)mm^(3)/(N·m).涂层在中高温下体现出优异的润滑和耐磨性能,这主要得益于MoS_(2)特殊层状结构和弱的剪切应力以及高硬度无机非晶态陶瓷相SiOC的形成.该涂层的成功制备有望为高温工况下服役的零部件表面润滑防护提供理论依据及数据支持.High-temperature solid self-lubricating coatings have found extensive applications in aviation,aerospace and various other fields,owing to their remarkable tribological properties and adhesive characteristics.In this study,a novel wide-temperature range anti-friction and anti-wear coating in simple composition was prepared based on polysilazane,which could be converted into a high hardness inorganic amorphous ceramic phase SiOC at high temperatures as the film-forming materials with excellent interfaced bonding strength and wear resistance property,and MoS_(2) as the lubrication phase.The effects of various factors on the tribological properties of the coatings were systematically investigated,the microstructures,phase compositions and wear mechanism of the coating were analyzed through SEM,XRD,Raman and pencil hardness characterization.The results indicated that the polysilazane/MoS_(2) coatings prepared at lower heat treatment temperatures(25~300℃)exhibited excellent adhesion to the metal substrate.However,at high temperature(500℃),the mass loss of polysilanze during the ceramic conversion process led to crack formation and poor adhesion,primarily due to the substantial density increased and volume shrinkage of polysilazane during conversion to ceramics.Additionally,the coating demonstrated exceptional anti-friction and anti-wear properties over a wide-temperature range,spanning from room temperature(25℃)to 300℃.Specifically,the coating subjected to a 300℃heat treatment performed optimally at 200℃,9 N,and 90 r/min,with an average friction coefficient of 0.05 and a wear rate of 7.6×10^(-5) mm^(3)/(N·m).This coating exhibited outstanding lubrication and wear resistance at medium-high temperatures,primarily attributed to the unique layered structure of MoS_(2) and its weak shear stress properties.However,as the heat treatment temperature reached 500℃,the average friction coefficient and wear rate of the coating increase significantly.This was mainly due to the oxidation of MoS_(2) in the coating to

关 键 词：聚硅氮烷 二硫化钼 宽温域 高温润滑 耐磨涂层 

分 类 号：TH117.2[机械工程—机械设计及理论]