镀镍碳纤维增强铜基矿车制动材料制备及性能分析  

Preparation and property analysis of nickel-plated carbon fiber-reinforced copper-based materials for mine vehicle brake

作　　者：李雪伍 段世龙 张传伟[1] 石甜 LI Xuewu;DUAN Shilong;ZHANG Chuanwei;SHI Tian(College of Mechanical and Engineering,Xi’an University of Science and Technology,Xi’an 710054,China)

机构地区：[1]西安科技大学机械工程学院,陕西西安710054

出　　处：《西安科技大学学报》2023年第4期769-778,共10页Journal of Xi’an University of Science and Technology

基　　金：国家自然科学基金项目(52275211,51974229);陕西省创新能力支撑计划项目(2021KJXX-38,2021TD-27);中国博士后科学基金项目(2021M693883)。

摘　　要：针对矿用车辆在恶劣工况下长时间制动引起的摩擦片失效问题,通过放电等离子烧结技术制备新型镀镍碳纤维增强铜基(CF/Cu)矿车制动材料。借助扫描电子显微镜(SEM)观察镀镍碳纤维及制动材料微观形貌,通过X射线衍射仪(XRD)对CF/Cu材料物相展开分析,同时对材料硬度、摩擦系数、磨损率进行系统研究,最后采用ANSYS仿真软件探究纤维长度对复合材料力学性能和应力场分布的影响。结果表明:改性后的CF/Cu制动材料界面结合性能良好,且当碳纤维长度为2 mm时,复合材料硬度达到最大值80.22 HV,其耐磨性也最优。进一步增加碳纤维长度至3 mm,纤维出现明显缠绕及团聚特征,且制动材料力学性能呈下降趋势。此外,2 mm CF/Cu制动材料应力值最小,约为178.21 MPa,且碳纤维与基体界面结合性能良好。同时,外力作用下2 mm碳纤维能有效承受部分载荷阻止金属变形,进而增强制动材料抗拉性能。综上所述,2 mm镀镍碳纤维增强铜基矿车制动材料力学及摩擦学性能最佳。In order to solve the problem of friction plate failure caused by long-time braking of mining vehicles under severe working conditions,a new type of nickel-plated carbon fiber-reinforced copper-based(CF/Cu)mining vehicles brake material was prepared by spark plasma sintering technology.The scanning electron microscope(SEM)was used to observe the micro morphology of nickel-plated CF and brake materials.The phase of CF/Cu materials were analyzed by X-ray diffraction(XRD).And the hardness,friction coefficient and wear rate of CF/Cu materials were systematically examined.The effect of fiber length on the mechanical properties and stress field distribution of the composites were investigated by ANSYS simulation software.The results show that the interface bonding property of the modified CF/Cu brake materials are ideal.When the CF length is 2 mm,the hardness of the composite reaches the maximum value of 80.22 HV,and its wear resistance is also the optimal.As CF length is further increased to 3 mm,the fiber has obvious characteristics of winding and agglomeration,and the mechanical properties of brake materials show a downward trend.In addition,the stress value of 2 mm CF/Cu brake material is the minimum,about 178.21 MPa,and the interface bonding property between CF and matrix is ideal.Mean while,under the action of external force,2 mm CF can effectively withstand a part of the load to prevent metal deformation,thereby enhancing the tensile properties of brake materials.Thus the mechanical and tribological properties of 2 mm nickel-plated carbon fiber-reinforced copper-based mine vehicle brake material are the best.

关 键 词：摩擦磨损 矿车制动材料 放电等离子烧结 碳纤维 有限元仿真 

分 类 号：TB331[一般工业技术—材料科学与工程]