1. Institute of Tribology, School of Mechanical Engineering, Hefei University of Technology, Hefei, P. R. China
2. 214 Institute of China North Industries Group, Suzhou, P. R. China
3. Department of Mechanical Design Engineering, School of Mechanical Engineering, Hefei University of Technology, Hefei, P. R. China
4. School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, P. R. China