Fast Fabrication and Wear Behavior of Alumina-nickel Composites

摘要

Alumina-nickel (20 wt％) composites were sintered by spark plasma sintering process.The influence of sintering temperature (1400-1550 °C) on densification and grain size of the composites was investigated (heating rate is 200 °C/min,sintering time is 5 min).Wear behavior of samples obtained by SPS was evaluated in a dry condition with reciprocate ball-on-disk testing machine.The results show that the relative density and alumina grain sizes increase with the increasing sintering temperature,and the fine-grained structure (alumina size controlled in 1-2 μm) could obtained at a temperature of 1400 °C; the alumina grain size increase to 5 μm at a temperature higher than 1500 °C.The fine-grained structure samples exhibit higher wear resistance.