1. Key Laboratory of Science and Technology on Wear and Protection of Materials Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 China
2. Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 China
3. Beijing Key Laboratory of Long-Life Technology of Precise Rotation and Transmission Mechanisms Beijing Institute of Control Engineering Beijing 100029 China
4. School of Materials Science and Engineering North University of China Taiyuan 030051 China