摘要
采用放电等离子烧结技术制备了Ni-Mo-Y-Gr(石墨烯)自润滑复合材料,通过光学显微镜、扫描电镜、X射线衍射、拉曼及高温摩擦实验机对复合材料的微观组织、成分、力学性能及摩擦磨损性能进行了研究。结果表明:Ni-Mo-Y-Gr复合材料的组织均匀致密,随着石墨烯含量的增加,复合材料的密度、硬度及屈服强度呈下降趋势,实际密度大于计算理论密度,即复合材料制备过程中发生了冶金熔合与固溶;Ni-Mo-Y-Gr复合材料在室温至600℃范围内具有较低的摩擦系数及磨损率,表明其具有较好的摩擦学性能;在室温、200和400℃时石墨烯起到了良好的润滑作用,在600℃时的主要润滑相为石墨烯、NiO、MoO2、MoO3和NiMoO_(4);在800℃时形成NiMoO_(4)及镍钼的氧化物,难以形成完整、有效的润滑层,从而使复合材料的摩擦学性能有所下降。
Ni-Mo-Y-Gr(graphene)self-lubricating composites were prepared by discharge plasma sintering technology,and microstructure,composition,mechanical properties and friction and wear properties of the composites were studied by means of optical microscope,scanning electron microscopy,X-ray diffraction,Raman spectroscopy and high-temperature friction testing machines.The results show that the microstructure of the Ni-Mo-Y-Gr composites is uniform and dense.With the increase of graphene content,the density,hardness and yield strength of the composites show a decreasing trend.The actual density of the composites is higher than that of the calculated theoretical density,indicating that metallurgical fusion and solid solution occur during the preparation process of the composites.The Ni-Mo-Y-Gr composites have low friction coefficient and wear rate in the temperature range of room temperature to 600℃,indicating they have good tribological properties.Graphene has a good lubricating effect at room temperature,200 and 400℃,and the main lubricating phases at 600℃are graphene,NiO,MoO2,MoO3 and NiMoO_(4).The formation of NiMoO_(4) and nickel molybdenum oxides at 800℃makes it difficult to form a complete and effective lubrication layer,resulting in a decrease in the tribological properties of the composites.
作者
陆龙
杨贵荣
苏霄鹏
张文辉
王静波
LU Long;YANG Gui-rong;SU Xiao-peng;ZHANG Wen-hui;WANG Jing-bo(Lanzhou Institute of Industry Research,Lanzhou 730050,China;State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China;School of Chemical Engineering,Lanzhou University of Arts and Science,Lanzhou 730000,China;State Key Laboratory of Solid Lubrication,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China)
出处
《材料热处理学报》
CAS
CSCD
北大核心
2024年第4期29-39,共11页
Transactions of Materials and Heat Treatment
基金
兰州市科技计划项目(2019-1-17)
国家级“大学生创新创业训练计划”项目(202111562007)。
