1. School of Mechanical Engineering; Yanshan University; Qinhuangdao 066004 People's Republic of China
2. Aviation Key Laboratory of Science and Technology on Generic Technology of Self-Lubricating Spherical Plain Bearing; Yanshan University; Qinhuangdao 066004 People's Republic of China
3. School of Environment and Chemical Engineering; Yanshan University; Qinhuangdao 066004 People's Republic of China
4. School of Material Science and Engineering; Yanshan University; Qinhuangdao 066004 People's Republic of China