纳米Al_2O_3颗粒增强新型铜基自润滑复合材料

Nano-Al_2O_3 particle reinforced Cu-based self-lubricating composites

以Cu-Ni-Y2O3-MoS2-Graphite混合粉为基体,加入质量分数分别为0%、1%、2%、3%、4%的纳米Al2O3增强相,采用粉末冶金方法制备纳米Al2O3增强新型铜基自润滑复合材料。结果表明：随着铜合金粉末中纳米Al2O3颗粒含量的增加,所制备自润滑复合材料样品的密度下降,但硬度和压溃强度先上升后下降,在Al2O3含量为2%时硬度从HV 23.7增加到HV 35.1,压溃强度从189 MPa提高到276 MPa。由石墨和MoS2组成的混合固体自润滑材料的摩擦系数小且稳定,约0.12。Al2O3质量分数为2%的样品磨损量最小,是未加Al2O3试样磨损量的1/7～1/8。铜基体经过镍、纳米Al2O3等弥散颗粒强化和固体润滑相石墨和MoS2的加入,所制备的材料已具有一定的自润滑性能。

Taking the mixture powders of Cu-Ni-Y2O3-MoS2-Graphite as the matrix,and adding nano-Al2O3 mass fraction of 0%,1%,2%,3% and 4% as the particle ment reinforce phase,Cu-based self-lubricating composite was prepared by powder metallurgy technology.The results show that the density of the samples decreases with increasing the content of nano-Al2O3,but the hardness and crushing strength of the samples increase firstly,then decrease.The hardness increas from HV 23.7 to HV 35.1 and the crushing strength increases from 189 to 276 MPa with the increasing mass frautions of nano-Al2O3 from 0% to 2%.Friction coefficient of the materials with the mixture of graphite and MoS2 is about 0.12.The least wear loss is 1/7~1/8 by contrasting the sample with non-nano-Al2O3.The copper-based self-lubricating composites reinforced with Ni and nano-Al2O3 by dispersion strengthening,and added with graphite and MoS2 as solid lubricant,have definite self-lubricating property.