Friction and Wear Properties of Carbon Nanotubes/AZ91 Composites
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摘要: 采用粉末冶金法和热挤压工艺制备了碳纳米管增强AZ91镁合金(CNTs/AZ91)复合材料，研究了复合材料在干滑动条件下的摩擦磨损性能、磨损形貌及磨损机制，并与AZ91镁合金基体的进行了对比。结果表明：由于CNTs的自润滑和增强作用，复合材料的摩擦磨损性能明显优于基体合金的;随着载荷和CNTs质量分数增加，复合材料的摩擦因数逐渐降低;随着载荷增加，复合材料的磨损量增大;在相同的载荷下，复合材料的磨损量随CNTs质量分数的增大而减小;AZ91镁合金的磨损机制为疲劳磨损和磨粒磨损，复合材料的磨损机制以轻微的粘着磨损和磨粒磨损为主。Abstract: Carbon nanotubes (CNTs) reinforced AZ91 magnesium alloy composites were fabricated by powder metallurgy method and followed hot extrusion process. The friction and wear properties, wear morphology and wear mechanism of the composites under dry sliding friction conditions were investigated and compared with that of AZ91 magnesium alloy matrix . The results show that the friction and wear properties of the composites were better than that of AZ91 magnesium alloy matrix due to the effect of self-lubricating and strengthening of CNTs. Moreover, the friction factor of the composites gradually declined with the increase the load and the content of CNTs. In addition, wear mass loss of the compositse increased with the increase of the load. However, under the same condition of the load, the wear mass loss of the composites decreased with increase the contents of CNTs. The main wear mechanism of AZ91 magnesium alloy were fatigue wear and abrasive wear, and that of the composites was slight adhesive wear and abrasive wear.
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