Controlled nitrogen content synthesis of hafnium carbonitride powders by carbonizing hafnium nitride for enhanced ablation properties |
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| Affiliation: | 1. Powder Metallurgy Research Institute, Central South University, Changsha, 410083, China;2. College of Materials Science and Engineering, Central South University, Changsha, 410083, China;1. School of Materials Science and Engineering, Xiangtan University, Xiangtan, 411105, China;2. State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070, China;1. School of Materials Science and Engineering, Anhui University of Technology, Maanshan, 243032, PR China;2. Key Laboratory of Metallurgical Emission Reduction & Resources Recycling, Ministry of Education, Anhui University of Technology, Maanshan, 243002, PR China;3. School of Metallurgical Engineering, Anhui University of Technology, Maanshan, 243032, PR China;1. School of Mechanical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, China;2. Shandong Machinery Design and Research Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250031, China;3. Key Laboratory of Advanced Manufacturing and Measurement and Control Technology for Light Industry in Universities of Shandong, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, China;4. Shantui Construction Machinery Co., Ltd., Jining, 272035, China;1. College of Materials, Key Laboratory of High Performance Ceramic Fibers (Xiamen University), Ministry of Education, Xiamen, 361005, China;2. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi''an, 710072, China;3. Department of Materials and Earth Sciences, Technical University of Darmstadt, 64287, Darmstadt, Germany;4. College of Materials, Xiamen Key Laboratory of Electronic Ceramic Materials and Devices, Xiamen University, Xiamen, 361005, China |
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| Abstract: | In this study, a new method of carbonizing hafnium nitride was proposed to synthesize ultrahigh-temperature hafnium carbonitride (HfCxNy) powders. The new method helps to maintain both the purity of phases and control the content of nitrogen in the HfCxNy. The results show that the as-prepared HfCxNy powders have a single phase, with an average particle size of approximately 2 , and Hf, C and N are evenly distributed. Moreover, the microstructures, phase compositions, ablation properties and mechanism of the HfC0.62N0.38 composites under a plasma ablation environment were studied in detail. The results show that the HfC0.62N0.38 composites exhibited excellent ablation resistance at 3073 K for 60 s and the ablation mechanism of HfC0.62N0.38 can be identified as HfC0.62N0.38→HfCxOy→HfO2. The mass ablation rate of the HfC0.62N0.38 composite is evaluated to be 1.36 mg/cm2?s, which is lower than that of HfC ceramics. Our work is intended to provide new insight regarding the development of ultrahigh-temperature ceramics and widen their applications. |
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| Keywords: | Hafnium carbonitride Carbonizing Plasma ablation Ablation resistance |
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