1. Xi’an Research Institute of China Coal Technology and Engineering Group Corp, 1 Jingye Road, Xi’an, Shaanxi 710077, P. R. China
2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, 127 Youyi Road, Xi’an, Shaanxi 710072, P. R. China
3. School of Materials Science and Engineering, Xi’an Shiyou University, 18 Dianzier Road, Xi’an, Shaanxi 710065, P. R. China