Tribological behavior of Ni-Cr-based composite at high temperatures
The wear behavior of Ni-Cr-based alloys was investigated at ambient and elevated temperatures. The wear samples were prepared by metallurgical hot pressing. Wear tests were carried out on a general purpose wear testing machine having a heating unit and pin-disc sample configuration. The counterface material was prepared from Al2O3 ceramics. The tests were carried out at temperatures of room temperature (RT), 200℃, and 600℃. The effects of temperatures on the tribological properties were determined by using optical microscopy, and XRD analysis. The results show that at room temperature the worn surfaces of the alloys were characterized by mild scuffing and micro cracks, the action of nano-crystal structural wear debris on the worn surfaces is responsible for reduction of friction. At 200℃, the friction coefficient is the highest. The worn surfaces of the alloys were adhesive and oxidative. At 600℃, the friction coefficient is reduced due to the effect of the oxides, tungstates and sulfides residue on the worn surface.
Nickel based alloys powder metallurgy wear mechanism dry friction high temperature
Mao-Quan XUE
Changzhou Institute of Light Industry Technology Changzhou，China 213164
国际会议
郑州
英文
2007-10-23（万方平台首次上网日期，不代表论文的发表时间）