SiO_(2)表面金属包覆处理对铜基粉末冶金材料制动摩擦磨损性能的影响  

Effect of SiO_(2) Surface Metal Coating Treatment on the Braking Friction and Wear Properties of Cu-Based Powder Metallurgy Materials

作　　者：刘军锋 张鑫[1,2] 上官宝[1,2] 商宏飞[3] 傅丽华 杜三明[1,2] LIU Junfeng;ZHANG Xin;SHANGGUAN Bao;SHANG Hongfei;FU Lihua;DU Sanming(National United Engineering Laboratory for Advanced Bearing Tribology,Henan University of Science and Technology,Luoyang Henan 471023,China;School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang Henan 471023,China;State Key Laboratory of Tribology in Advanced Equipment,Tsinghua University,Beijing 100000,China)

机构地区：[1]河南科技大学高端轴承摩擦学技术与应用国家地方联合工程实验室,河南洛阳471023 [2]河南科技大学材料科学与工程学院,河南洛阳471023 [3]清华大学高端装备界面科学与技术全国重点实验室,北京100000

出　　处：《润滑与密封》2023年第6期15-24,共10页Lubrication Engineering

基　　金：国家自然科学基金项目(U1804252);清华大学高端装备界面科学与技术全国重点实验室开放基金项目(SKLTKF21B10);河南省科技攻关项目(212102210433);河南省自然科学基金项目(202300410143)。

摘　　要：为改善摩擦组元SiO_(2)颗粒与铜基体间界面结合性能,通过表面金属包覆处理的方式制备铜包覆SiO_(2)。分别以铜包覆SiO_(2)和普通SiO_(2)颗粒作为摩擦组元之一,利用SPS烧结技术制备2种铜基粉末冶金摩擦材料。分析2种摩擦材料的微观组织、力学及物理性能,在MM1000-Ⅱ型惯性制动试验台上测试2种摩擦材料的制动摩擦磨损性能,并对2种摩擦材料的摩擦表面及其三维形貌特征、磨屑特征和摩擦表面物相进行微观分析,研究SiO_(2)表面金属包覆处理对制动条件下铜基粉末冶金材料摩擦磨损性能的影响。结果表明:经铜包覆处理的SiO_(2)与Cu基体间的界面结合性能明显改善,提高了材料的硬度、致密度及导热系数,特别是导热系数得到了显著提升;随着制动初速度的升高,2种摩擦材料的平均摩擦因数均呈现先上升后下降的趋势;在相同的制动条件下,与含普通SiO_(2)材料相比,除了制动压力为0.8 MPa、制动初速度为100 km/h外,在其他各制动条件下含铜包覆SiO_(2)材料具有较高的平均摩擦因数和较低的磨损率,且其摩擦表面更为平整;提高制动初速度均能够促进2种摩擦材料表面形成以氧化膜为主的摩擦膜,且含铜包覆SiO_(2)材料的摩擦膜更均匀,因而保护作用更好,即磨损率低。To improve the interfacial bonding performance between friction component SiO_(2) particles and copper matrix.Two copper-based powder metallurgy friction materials were prepared by using SPS sintering technology with Cu-coated SiO_(2) and uncoated SiO_(2) particles as one of the friction components.The microstructure,mechanical and physical properties of the two friction materials were analyzed,and the braking friction and wear properties were tested on the MM1000-Ⅱ inertia braking test bench.The microscopic analyses on the features of friction surfaces and 3D morphology,wear debris and surface phases of the two friction materials were carried out,and the influences of metal coating on SiO_(2) surface on braking friction and wear properties of copper-based powder metallurgical friction material were studied.The results show that the Cu-coating treatment of SiO_(2) can strengthen the interface bond between SiO_(2) and copper matrix and improve the hardness,density and thermal conductivity of material,especially a significant increase in thermal conductivity.With the increase of the initial braking speed,the average friction coefficients of the two friction materials show a trend of increasing first and then decreasing.Under the same braking conditions,compared with ordinary SiO_(2) materials,except that the braking condition of pressure of 0.8 MPa and initial braking speed of 100 km/h,the copper-coated SiO_(2) containing material has higher average friction coefficient and lower wear rate under other braking conditions,and its friction surface is smoother.Increasing the initial braking speed can promote the formation of a friction film dominated by oxide films on the surfaces of the two friction materials,and the friction film of the copper-coated SiO_(2) containing material is more uniform,so the protection effect is better,that is,the wear rate is low.

关 键 词：铜基粉末冶金 SiO_(2) 制动 摩擦磨损 摩擦膜 

分 类 号：TH117.1[机械工程—机械设计及理论]