School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China;
School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China;
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China;
Bearing and Lubrication Theory Institute, Xi'an Jiaotong University, Xi'an 710048, China;
School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China;
dry sliding; fractal analysis; 3-D surface;