1. State Key Laboratory of Solidification Processing, Center for Advanced Lubrication and Seal Materials, School of Materials Science and Engineering, Northwestern Polytechnical University, 127 YouYi Western Road, Xi’an, Shaanxi 710072, China
2. School of Materials Science and Engineering, Xi’an Jiaotong University, 28 Xianning West Road, Xi’an, Shaanxi, 710049, China