Effect of Temperature on Tribological Properties of Cu/Ti3AlC2 Composites

摘要

In aerospace and power generation, components will serve in high-temperature environments. In this work, the influence of temperature on the tribological performances of Cu/Ti3AlC2 composites was investigated from 25 degrees C to 700 degrees C. Cu/Ti3AlC2 composites were fabricated by hot-pressing at 800 degrees C. The friction coefficients of the composites were in the range of 0.19-0.28. From 25 degrees C to 300 degrees C, the wear-rates increased with temperature from 9.05 x 10(-5) mm(3)/Nm to 110 x 10(-5) mm(3)/Nm, and the wear-rate reached the highest value at 300 degrees C. Interestingly, the wear-rates plummeted to 30.8 x 10(-5) mm(3)/Nm at 500 degrees C, and 31.2 x 10(-5) mm(3)/Nm at 700 degrees C. It was found that tribofilms consisting of Ti3AlC2 and Cu2O covered on the wear surfaces at 25 degrees C and 100 degrees C. Plastic flow and material transfer occurred at 300 degrees C. From 500 degrees C to 700 degrees C, oxidation layers formed on the wear surfaces of the composites. For simplicity, a schematic of the tribological mechanisms is proposed.