Nano-Al₂O₃ particle reinforced Cu-based self-lubricating composites

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.