Cu-Fe基粉末冶金闸片制动特性的研究

Braking properties of Cu-Fe based powder metallurgy braking materials

以铸钢为制动盘、Cu-Fe基粉末冶金材料为闸片组成摩擦副，利用MM-1000II型摩擦磨损性能试验机研究了制动速度（60～380km／h）、制动压力（0．3～0．5MPa）对摩擦系数、闸片温升、制动距离和制动扭矩的影响，并分析了闸片的磨损特点和物相变化。结果表明：摩擦材料的摩擦系数随制动速度的增加而减小，闸片表面温度随着制动压力增加而升高，刹车距离随着制动压力的增加而减小，不同制动速度下的闸片磨损机理主要是疲劳磨损、磨粒磨损和氧化磨损。

Using the cast steel as brake disc and Cu-Fe based powder metallurgy materials as braking materials to form a friction pair, the influence of braking speed （60-380 km/h） and braking pressure （0.3-0.5 MPa） on fric- tion coefficient, braking temperature, braking length and braking torque of braking material was studied by using MM-1000 II friction and wear testing machine. The wear and the surface microstructure of the braking materials af- ter braking test were analyzed. The results show that the friction coefficients of braking materials decrease with the increasing of braking speed. The increases in the braking pressure lead to the decreased braking distances and in- creased braking temperature. The wear mechanism of Cu-Fe based braking materials is mainly due to the fatigue wear, abrasive wear and oxidation wear at different braking speeds.