College of Mechanical and Engineering, Xi’an University of Science and Technology

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 miningvehicles 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. Thescanning electron microscope( SEM) was used to observe the micro morphology of nickel-plated CF andbrake materials. The phase of CF/ Cu materials were analyzed by X-ray diffraction( XRD) . And thehardness, friction coefficient and wear rate of CF/ Cu materials were systematically examined. The effectof fiber length on the mechanical properties and stress field distribution of the composites were investi-gated by ANSYS simulation software. The results show that the interface bonding property of the modi-fied CF/ Cu brake materials are ideal. When the CF length is 2 mm, the hardness of the composite rea-ches the maximum value of 80. 22 HV, and its wear resistance is also the optimal. As CF length is fur-ther increased to 3 mm, the fiber has obvious characteristics of winding and agglomeration, and the me-chanical properties of brake materials show a downward trend. In addition, the stress value of 2 mmCF/ Cu brake material is the minimum, about 178. 21 MPa, and the interface bonding property betweenCF and matrix is ideal. Mean while, under the action of external force, 2 mm CF can effectively with-stand a part of the load to prevent metal deformation, thereby enhancing the tensile properties of brakematerials. Thus the mechanical and tribological properties of 2 mm nickel-plated carbon fiber-reinforcedcopper-based mine vehicle brake material are the best.

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)；

0 引 言
1 试验材料与表征
1.1 试验材料
1.2 试验过程
1.3 试验表征
2 结果与讨论
2.1 微观形貌
2.2 力学性能测试
2.3 力学性能数值模拟
2.3.1 CF/Cu复合材料模型构建
2.3.2 单向拉伸下模拟结果应力场分析
3 结 论

[1]李雪伍,段世龙,张传伟,等.镀镍碳纤维增强铜基矿车制动材料制备及性能分析[J].西安科技大学学报,2023,43(04):769-778.

LI Xuewu,DUAN Shilong,ZHANG Chuanwei,et al.Preparation and property analysis of nickel-plated carbon fiber-reinforced cop-per-based materials for mine vehicle brake[ J].Journal of Xi’an University of Science and Technology,2023,43( 4):769-778.