纳米铜粉粒径对NAO型摩擦材料摩擦磨损性能的影响

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考察了纳米铜粉粒径、含量对酚醛树脂基摩擦材料摩擦磨损性能的影响，采用扫描电子显微镜分析磨损面形貌，并探讨其磨损机制。结果表明：与传统微米铜粉相比，纳米铜粉可使材料摩擦因数的稳定性提高一倍。随着铜粉尺寸的减小，摩擦材料的摩擦因数稳定性提高，磨损率也逐渐变小。添加2％铜粉（50nm）的摩擦材料摩擦因数最稳定且具有较低的磨损率。在高温段（350℃），添加50nm铜粉的材料磨损率仅为0．199×10^-7cm^3／（N?m），是添加微米铜粉的70％。SEM分析显示纳米铜粉使摩擦表面更平稳，添加了纳米铜粉的摩擦材料具有更稳定的摩擦因数及较低的磨损率。 The friction and wear properties of braking friction materials filled with different content and size of nano-Cu were studied, the worn surface was investigated by SEM, the abrasion mechanism was discussed. The results revealed that nano-Cu could significantly improve the stability of the friction performance. The friction stability of the materials filled with nano-Cu is much better than the materials filled with macro-Cu. With the decreasing of diameter of the copper, friction stability of the materials became much smoother and the wear resistance became better. At the elevated temperature （350 ℃）, the wear rate of the material filled with nano-Cu（50 nm） was just 0.199× 10^-7 cm^3/（N? m）, which was just about 70% of the material filled with macro-Cu. The addition of 2% nano-Cu （50 nm） could improve the wear resistance best. SEM study showed that nano-Cu was helpful to form smooth friction surface.