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 room temperature (RT),200 and 600 ℃ .The effects of temperatures on the tribological properties were determined by using optical ℃ microscopy,and X-ray diffractometry.The results show that at room temperature the worn surfaces of the alloys are characterized by mild scuffing and micro cracks,the action of nano-crystal structural wear debris on the worn surfaces is responsible for the reduction of friction.At 200 ,the friction coefficient is the highest.The worn surfaces of the alloys ℃ are 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.
Ni-based alloys powder metallurgy wear mechanism tribological behavior dry friction
XUE Mao-quan
Changzhou Institute of Light Industry Technology,Changzhou 213164,China
国际会议
2007年国际有色金属大会(International Conference of Nonfereous Materials 2007)(ICNFM)
长沙
英文
2007-11-28（万方平台首次上网日期，不代表论文的发表时间）