Abstract
A novel graphite/copper alloy-based self-lubricating composite materials were prepared using the powder metallurgy method by composing 663 bronze, Ni, W, nanoAl2O3, MoS2, Ag, CaF2, Sm2O3 as the basic alloy powder and adding 1wt.%, 1.5wt.%, 2wt.%, 2.5wt.%, 3wt.% graphite and nickel coated graphite powder respectively to the composite powder. The microstructure, mechanical properties and friction properties of the samples were studied. The results show that the samples with nickel coated graphite powder have their wettability and the composite structure between graphite and copper alloy matrix is improved. When the content of graphite is 3wt.%, the properties of samples prepared by Ni-coated graphite are improved compared with those prepared by uncoated graphite. The hardness is increased from 34HV to 38HV, the crushing strength is from 116MPa to 151MPa, the friction coefficient is reduced from 0.28 to 0.21, wear loss is reduced from 20mg to 12mg. The samples prepared by Ni-coated graphite have good self-lubricating performance.
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