稀土氧化物掺杂对铁基摩擦材料性能的影响

Effect of rare earth oxide doping on properties of iron-based friction materials

文章采用洛氏硬度计对摩擦材料的力学性能进行表征,利用电子扫描显微镜(SEM)和MM-3000型摩擦磨损性能试验台,研究了微观形貌和摩擦磨损性能。研究结果表明:微量的稀土氧化物掺杂在铁基摩擦材料中可细化晶粒,降低烧结密度和硬度。相较于掺杂CeO_(2)和Dy_(2)O_(3),掺杂La_(2)O_(3)更有利于提高铁基摩擦材料的平均摩擦系数和耐热系数,并且在压力2000 N,转速6000 r/min的试验条件下,摩擦后的试样表面较为平整,无明显的犁沟和摩擦组元脱落现象。

In this paper,the mechanical properties of iron-based powder friction materials doped with rare earth oxides prepared by powder metallurgy were characterized by rockwell hardness tester.The microstructure and friction and wear properties were studied by electron scanning microscope(SEM)and MM-3000 friction and wear performance test bench.The results show that the doping of trace rare earth oxides in iron-based friction materials can refine the grain size and reduce the sintering density and hardness.Compared with doping CeO2 and Dy2O3,doping La2O3 is more beneficial to improve the average friction coefficient and heat resistance coefficient of iron-based friction materials.And under the test conditions of pressure 2000 N and rotation speed 6000 r/min,the surface of the rubbed sample is relatively flat,and there is no obvious furrow and friction component shedding.