混合澄清槽搅拌装置滑动轴承设计及磨损性能研究  

Design and Wear Performance of Sliding Bearing of Stirring Device of Mixer-Settler

作　　者：徐磊 李光俊 段宏 韩杰胜[2] 王小超 孟军虎[2] XU Lei;LI Guangjun;DUAN Hong;HAN Jiesheng;WANG Xiaochao;MENG Junhu(China Nuclear Power Engineering Co.,Ltd,Beijing 100840,China;Key Laboratory of Science and Technology on Wear and Protection of Materials,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Gansu Lanzhou 730000,China)

机构地区：[1]中国核电工程有限公司,北京100840 [2]中国科学院兰州化学物理研究所中国科学院材料磨损与防护重点实验室,甘肃兰州730000

出　　处：《摩擦学学报》2022年第5期1036-1043,共8页Tribology

摘　　要：针对混合澄清槽搅拌装置运行工况的特殊要求,以改善其滑动轴承使用性能及寿命为目标,选用和研制WC-VC-Ni-Cr-Mo金属陶瓷复合材料(WN20)和铁-镍-铬-石墨-二硫化钼自润滑复合材料(FC13).考察了复合材料的微观组织、力学和摩擦学性能,结果表明WN20金属陶瓷复合材料具有优异的力学性能,FC13金属基自润滑复合材料在干摩擦状态下具有良好的自润滑和抗磨损性能,是滑动轴承组件摩擦副轴瓦的合适材料.根据固体润滑滑动轴承的设计原则,设计滑动轴承组件结构及相应的润滑方式.采用C13金属基自润滑复合材料制造轴瓦,并通过嵌入特种润滑剂的方式进行辅助润滑,与WN20金属陶瓷轴组成摩擦副时,滑动轴承组件表现出优异的摩擦磨损性能,经过250 h摩擦试验,摩擦系数和轴瓦温度无显著变化,摩擦系数为0.08,轴瓦径向磨损量为3.8μm,均满足混合澄清槽搅拌装置的使用要求.Mixer-settler is the key equipment of liquid-liquid extraction in spent fuel reprocessing plant.The mixersettler of the spent fuel reprocessing plant has long-distance power transmission,and the lower end of the stirring device is supported by two sets of sliding bearing,and no addition of lubricating grease is allowed during operation.The working environment of mixer-settler has nitric acid vapor corrosion and radioactive radiation.According to operating experience,sliding bearing failure is one of the key factors restricting the long-term reliable operation of the mixersettler.In this study,through the design of self-lubricating composites,the design of sliding bearing structure and the selection of lubrication mode,the maintenance free and long service life of sliding bearing of mixer-settler was realized.According to the design principle of self-lubricating composite,a kind of cermet composite material and a kind of selflubricating composite were provided,an embedded lubricating sliding bearing assembly was designed.The metalceramic composite material(WN20) developed in this study had excellent mechanical properties.Titanium carbide and tungsten carbide particles were used as the ceramic phase of the cermet composite material,and vanadium carbide was the inhibitor of abnormal grain growth.Due to the requirements of the service conditions(i.e.the use of cobalt and copper was avoided),nickel as the main metal binder phase,and chromium and molybdenum as the minor metal binder phase are used instead.The spark plasma sintering technology was selected for the preparation process of the cermet composite material.The density,hardness,compressive strength,bending strength,fracture toughness,impact toughness and linear expansion coefficient were 13 g/cm~3,81 HRA,3 052 MPa,730 MPa,17.1 MPa·m,2.04 J/cm~2 and 6.1×10℃,respectively.The spark plasma sintering technology was selected for the preparation process of the cermet composite material.The metal-based self-lubricating composite(FC13),which was composed of Fe,Ni,Cr

关 键 词：混合澄清槽 自润滑复合材料 滑动轴承组件 摩擦磨损性能 

分 类 号：TH117.1[机械工程—机械设计及理论] TH113