Fabrication of ultra-high-temperature nonstoichiometric hafnium carbonitride via combustion synthesis and spark plasma sintering |
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| Affiliation: | 1. Science and Technology on Thermostructural Composite Materials Laboratory, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi''an, 710072, China;2. School of Materials Science and Engineering, South China University of Technology, Guangzhou, 5100640, China;3. School of Mechanical Engineering, Southwest Jiaotong University, Chengdu, 610031, China;4. MSEA-NPU Joint Innovation Center for High Performance Computation of Advanced Materials, MSEA International Institute for Materials Genome, Gu''an, 065500, Hebei, China;1. Joint Institute for High Temperatures (JIHT), Russian Academy of Sciences, Moscow, 125412 Russia;2. National Scientific Research Institute of Aviation Materials (VIAM), Moscow, 105005 Russia;1. The Hubei Province Key Laboratory of Coal Conversion & New Carbon Materials, Wuhan University of Science and Technology, Wuhan, Hubei 430081, PR China;2. School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, U.K;1. Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN, 46556, USA;2. Center of Functional Nano-Ceramics, National University of Science and Technology “MISiS”, Moscow, 119049, Russia |
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| Abstract: | In this study, nonstoichiometric hafnium carbonitrides (HfCxNy) were fabricated via short-term (5 min) high-energy ball milling of Hf and C powders, followed by combustion of mechanically induced Hf/C composite particles in a nitrogen atmosphere (0.8 MPa). The obtained HfC0.5N0.35 powder exhibited a rock-salt crystal structure with a lattice parameter of 0.4606 nm. The melting point of this synthesized ceramic material was experimentally shown to be higher than that of binary hafnium carbide (HfC). The nonstoichiometric hafnium carbonitride was then consolidated under a constant pressure of 50 MPa at a temperature of 2000 °C and a dwelling time of 10 min, through spark plasma sintering. The obtained bulk ceramic material had a theoretical material density of 98%, Vickers hardness of 21.3 GPa, and fracture toughness of 4.7 MPa m1/2. |
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| Keywords: | Ultra-high-temperature ceramics Hafnium carbonitride High-energy ball milling Combustion synthesis Spark plasma sintering |
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