Influence of A1_2O_3 particle content on the sliding wear behaviour of ZA-27 alloy composites

摘要

The lubricated and dry sliding wear behaviour of ZA-27 alloy composites reinforced with A1_2O_3 particles of size 250 μn was evaluated. The content of A1_2O_3 particles in the alloy was 3, 5 and 10 wt.%. Composites were produced by the compocasting process using mechanical mixing of the matrix, i.e. A1_2O_3 particles as reinforcement were added into the semi-solid ZA-27 alloy by infiltration and admixing. A block-on-disc wear test device was used to evaluate the wear rate, whereat 30CrNiMo8 steel disc was used as the counterface, under dry and lubricated sliding conditions at different specific loads and sliding speeds. Results indicated that the wear rates of the composites were lower than those of the matrix alloy and further decreased with the increase in A1_ 2O_3 particles content in all combinations of applied loads and sliding speeds both in dry and lubricated tests.