Synthesis of rod-like ZrB2 crystals by boro/carbothermal reduction |
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| Affiliation: | 1. Henan Province Industrial Technology Research Institute of Resources and Materials, Zhengzhou University, Zhengzhou, 450001, China;2. School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China;3. Zhengzhou Institute of Aeronautical Industry Management, Zhengzhou, 450015, China;4. Department of Materials and Engineering, University of Central Florida, Orlando, FL, 32826, USA;1. School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, China;2. School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China;1. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, China;2. State Key Laboratory of Traction Power, School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China;3. Department of Materials Science and Engineering, Advanced Materials Processing and Analysis Center, University of Central Florida, Orlando, FL 32766, USA |
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| Abstract: | Rod-like ZrB2 crystals were synthesized at 1600 °C in Ar atmosphere by boro/carbothermal reduction using ZrOCl2⋅8H2O, B4C and carbon powders as raw materials. The optimum molar ratio of raw materials required to form pure ZrB2 grains was found to be 2: 1.2: 3. With increase in temperature and subsequent heat preservation stage, ZrB2 powders grew into a rod-like morphology along the c axis. The rod-like ZrB2 grains obtained at 1600 °C have diameters of 0.5–3 μm and high aspect ratios of >8. Effects of molar ratio of raw materials, heating temperature and holding time on the phase composition and final morphology were investigated. Growth mechanism of rod-like ZrB2 grains was also analyzed. |
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| Keywords: | Boro/carbothermal reduction C axis |
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