紫铜纤维对汽车摩擦材料性能的影响

Effect of copper fiber on performance of automotive friction materials

以一种成熟的树脂基摩擦材料配方为基础,研究紫铜纤维质量分数对摩擦材料物理性能、力学性能、摩擦磨损性能及制动噪声的影响。结果表明:随紫铜纤维质量分数增加,摩擦材料的密度、硬度、内剪切强度逐渐增大,气孔率、压缩量逐渐降低,pH值则随紫铜纤维质量分数的变化没有明显的区别;通过执行SAE J2521和SAE J2522程序进行台架实验,发现紫铜纤维的添加对摩擦材料名义摩擦因数的影响较小;添加适量紫铜纤维有利于改善摩擦材料与对偶件表面的接触状态,稳定摩擦因数,提高摩擦材料的抗衰退性能;随紫铜纤维含量增加,摩擦材料的磨损率先降低后略微上升,紫铜纤维质量分数为9%时,磨损率最低;当紫铜纤维质量分数在7%时,摩擦材料具有最佳的噪声性能。

Based on a mature formula of resin based friction material,the influence of copper fiber content(mass fraction)on the physical properties,mechanical properties,friction and wear properties and brake noise of friction material was studied.The results show that the density,hardness and internal shear strength of the friction material are increased with the increase of the content of copper fiber,the porosity and compression amount are decreased gradually,and the pH value has no obvious difference with the change of the content of copper fiber.Through the bench test of SAE J2521 and SAE J2522,it is found that the addition of copper fiber has little effect on the nominal friction coefficient of the friction material.Adding proper amount of copper fiber is beneficial to improve the contact state between the friction material and the surface of the dual part,stabilize the friction coefficient,and improve the anti-fading performance of the friction material;with the increase of the content of copper fiber,the wear rate of the friction material is first decreased and then slightly increased,and when the mass fraction of copper fiber is 9%,the wear rate is the lowest;adding proper amount of copper fiber is beneficial to suppress the generation of noise,when the mass fraction of copper fiber is 7%,the noise performance is the best.