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Reactive plasma spraying of supersaturated tungsten super-hard Ta-Hf-W-C solid solution coating
Affiliation:1. School of Materials Science and Engineering, Xiangtan University, Hunan, 411105, China;2. School of Advanced Materials and Nanotechnology, Xidian University, Xi’an, 710126, China;1. School of Advanced Materials and Nanotechnology, Xidian University, Xi’an, 710126, China;2. Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education, School of Materials Science and Engineering, Xiangtan University, Xiangtan, 411105, China;3. College of Engineering, BIC-ESAT, Peking University, Beijing, 100871, China;1. Key Laboratory of Key Film Materials & Application for Equipment (Hunan Province), School of Materials Science and Engineering, Xiangtan University, Xiangtan, Hunan 411105, China;2. Key Laboratory of Low Dimensional Materials and Application Technology of Ministry of Education, School of Materials Science and Engineering, Xiangtan University, Xiangtan, Hunan 411105, China;3. College of Engineering, Peking University, Beijing 100871, China;1. School of Materials Science and Engineering, Central South University, Changsha, Hunan, 410083, China;2. Center for Mineral Materials, School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, Hunan, China;3. Key Laboratory of Non-ferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha, 410083, China;4. Department of Materials Engineering, Rensselaer Polytechnic Institute, Troy, New York, 12180, USA
Abstract:A supersaturated tungsten Ta-Hf-W-C solid solution coating is successfully prepared by a reactive plasma spraying. The reaction process and solution behavior of TaC-HfC-WC-C composite powder during induction plasma spheroidization (IPS) and vacuum plasma spraying (VPS) are described. Compared with the direct spraying, the coating made by IPS-VPS multi-stage plasma heating process has lower porosity and better composition uniformity. The highest hardness obtained by nanoindentation can reach up to 43.3 GPa due to solid solution strengthening. This work provides a new method and a potential material for thermal spraying super-hard coatings.
Keywords:Ultra-high-temperature  Supersaturated tungsten Ta-Hf-W-C solid solution  Induction plasma spheroidization  Vacuum plasma spraying  Super-hard coating
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