【摘要】 采用粉末冶金工艺制备了含铝和石墨的铜基粉末冶金摩擦材料,利用定速摩擦试验机,分别在干、湿状态下,探讨了各摩擦速度条件下铝对材料摩擦磨损性能的影响规律。结果表明,铝有利于稳定摩擦因数,提高材料的耐磨性,原因在于铝提高了材料的硬度,从而降低摩擦面微凸体的变形程度。在干摩擦状态下,低速条件下的摩擦因数随铝含量增加而减小,高速条件下的摩擦因数变化不明显;湿摩擦状态,水膜的润滑作用降低了摩擦因数,铝含量增加,有利于提高低速摩擦条件的摩擦因数。高速摩擦条件下,由于离心作用和水分的加热蒸发,水膜的润滑作用降低,摩擦因数波动不显著。更多还原

【Abstract】 Copper matrix composites with aluminium and graphite were prepared through powder metallurgy.The effects of aluminium content,the dry and wet condition on friction performance of the materials were studied with friction speed of 3～47 m/s,by means of a constant speed friction tester.The results show that aluminium is beneficial to stabilizing friction coefficient and decreasing wear rate due to aluminium increasing the hardness of materials,leading to reduce the asperity deformation.Under the condition of dry friction,friction coefficient increases and wear rate decreases with increasing aluminium content.Under the condition of wet friction,with increasing aluminium content the friction coefficient at low speed increases as a result of lubrication action of the water film,and the change of the friction coefficient at high speed is hardly noticeable due to the centrifugal effect and the evapotranspiration of water,leading to reduce the influnce of water film.更多还原