冻干法制备石墨烯负载二硫化钼及其润滑性能研究  

Study on Preparation of Graphene-loaded Molybdenum Disulfide by Freeze-Drying Method and Its Lubrication Performance

作　　者：彭润玲[1] 王威 刘锦悦 高展 郭俊德 张耿[1] PENG Runling;WANG Wei;LIU Jinyue;GAO Zhan;GUO Junde;ZHANG Geng(School of Mechatronic Engineering,Xi’an Technological University,Xi’an 710021,China)

机构地区：[1]西安工业大学机电工程学院,西安710021

出　　处：《材料导报》2025年第8期55-61,共7页Materials Reports

基　　金：国家自然科学基金(52175113);陕西省科技计划项目(2022GY-214);陕西省自然科学基础研究项目(2022JQ-986)。

摘　　要：为了可控制备石墨烯(RGO)和二硫化钼(MoS_(2))的润滑油纳米添加剂,进一步提高其宽温域下的润滑性能,采用冷冻干燥法一步制备了石墨烯负载二硫化钼(RGO/MoS_(2))纳米颗粒,利用扫描电子显微镜(SEM)及X射线衍射仪(XRD)观测其微观形貌和结构,通过正交实验探究工艺参数与RGO/MoS_(2)微观尺寸的关联性,研究了RGO/MoS_(2)在不同温度下的减摩抗磨性能。结果表明:冷冻干燥法制备的RGO/MoS_(2)纳米颗粒中MoS_(2)呈纳米花球状均匀吸附在RGO表面的缺陷位置,且薄片相互重叠,具有较优的分散稳定性。影响RGO/MoS_(2)中MoS_(2)片层厚度的因素排序为冻结方式>反应温度>反应时长>反应pH值,较优的制备方式为-20℃冻结、反应温度180℃、反应时长24 h、反应pH值为1。RGO/MoS_(2)作为润滑油添加剂在高温下具有比MoS_(2)单剂更好的减摩抗磨性能,添加1.5%(质量分数,下同)的RGO/MoS_(2)作为润滑油添加剂后,在250℃高温工况下平均摩擦系数和磨损率分别仅为0.062 5和2.95×10^(-9)cm^(3)/(N·m),相比MoS_(2)单剂分别降低54.3%和74.5%。In order to control the preparation of graphene and molybdenum disulfide lubricating oil nanoadditives and further improve their wide-temperature-range lubrication performance,graphene loaded molybdenum disulfide(RGO/MoS_(2))nanoparticles were prepared via a one-step freeze-drying method.The microstructure and morphology of the nanoparticles were observed by means of scanning electron microscopy(SEM)and X-ray diffractometry(XRD).The correlation between process parameters and the microstructure of RGO/MoS_(2) was explored through ortho-gonal experiments,and the anti-friction and anti-wear performance of RGO/MoS_(2) at different temperatures was studied.The results showed that the nanoflower-like spherical RGO/MoS_(2) nanoparticles prepared by freeze-drying method uniformly adsorbed on the defect positions on the RGO surface with its thin sheets overlapped with each other,hence exhibited excellent dispersion and stability performance.The factors affecting the thickness of MoS_(2) layers in RGO/MoS_(2) could be sorted as:freezing method>reaction temperature>reaction time>reaction pH value.The optimal preparation conditions determined included:-20℃freezing,reaction temperature 180℃,reaction time 24 h,and reaction pH=1.RGO/MoS_(2) as a lubricating oil additive has better friction reduction and wear resistance than MoS_(2) single agent at high temperatures.The addition of 1.5wt%RGO/MoS_(2) as a lubricating oil additive could achieve an average friction coefficient and a wear rate of only 0.0625 and 2.95×10^(-9)cm^(3)/(N·m),respectively,under high temperature conditions of 250℃,54.3%and 74.5%lower than those acquired by MoS_(2) single agent.

关 键 词：冷冻干燥 石墨烯 二硫化钼 摩擦磨损 润滑油添加剂 

分 类 号：TB117[理学—数学]