以Cu-Ni-Y_2O_3-MoS_2-Graphite混合粉为基体, 加入质量分数分别为0%、1%、2%、3%、4%的纳米Al_20_3增强相, 采用粉末冶金方法制备纳米Al_2O_3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Al_2O_3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Al_2O_3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. Al_2O_3质量分数为2%的样品磨损量最小, 是未加Al_2O_3试样磨损量的1/7～1/8. 铜基体经过镍、纳米Al_2O_3等弥散颗粒强化和固体润滑相石墨和MoS_2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-Y_2O_3-MoS_2-Graphite as the matrix, and adding nano-Al_2O_3 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-Al_2O_3, 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 from189 to 276 MPa with the increasing mass frautions of nano-Al_2O_3 from 0% to 2%. Friction coefficient of the materials with the mixture of graphite and MoS_2 is about 0.12. The least wear loss is 1/7～1/8 by contrasting thesample with non-nano-Al_2O_3. The copper-based self-lubricating composites reinforced with Ni and nano-Al_2O_3 by dispersion strengthening, and added with graphite and MoS_2 as solid lubricant, have definite self-lubricating properly.
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