1. Department of Materials Science and Engineering Xi'an University of Technology 5 South Jinhua Road Xi'an 710048 China
2. Shaanxi Province Key Laboratory for Electrical Materials and Infiltration Technology Xi'an University of Technology Xi'an Shaanxi 710048 China
3. Yunnan Chihong Zn&Ge CO., LTD Qujing Yunnan 655011 China