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以Cu Ni Y2O3MoS2Graphite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。
A new type of Cu-based self-lubricating composite was prepared by the powder metallurgy method with Cu Ni Y2O3MoS2Graphite powder as the matrix, and the nano Al2 O3 reinforcing phase with mass fraction of 0%, 1%, 2%, 3% and 4% respectively. The results show that with the increase of the content of nano-Al2O3 particles in the copper alloy powder, the density of the samples prepared from the self-lubricating composite material decreases, but the hardness and the crush strength first increase and then decrease. The hardness increases from HV 23.7 when the content of Al2O3 is 2% At HV 35.1, crush strength increased from 189 MPa to 276 MPa. The friction coefficient of a mixed solid self-lubricating material consisting of graphite and MoS2 is small and stable, about 0.12. The sample with the mass fraction of Al2O3 of 2% has the least amount of wear, which is 1/7 ~ 1/8 of that of the sample without Al2O3. The copper matrix has been strengthened by the dispersive particles of nickel and nano-Al2O3 and the graphite and MoS2 are added as solid lubricating phase. The prepared material has a certain self-lubricating property.