Synthesis of HfB2 powders by reduction of HfO2 with BN/C in a spark plasma sintering furnace
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Yaxin Wang
Abstract
The reduction of HfO2 to produce HfB2 powder currently represents the most cost-effective synthesis method. However, reduction processes employing B2O3, B4C or elemental B invariably involve volatile B2O3 species, which damage high-temperature furnaces. This work reports an alternative approach using BN/C as reductants in a spark plasma sintering (SPS) furnace to synthesize HfB2. The reaction mechanism involves two sequential steps: initial reduction of HfO2 by C to form non-stoichiometric HfC1-x, followed by reaction between HfC1-x and BN to yield HfB2. At 1,600 °C, phase-pure HfB2 powder with ultralow oxygen content (0.47 wt.%) was obtained. The synthesized powder exhibits submicron particle size (d50 = 0.184 μm) and a distinctive bimodal distribution pattern.
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Research ethics: Not applicable.
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Informed consent: Not applicable.
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Author contributions: All authors have accepted responsibility for the entire content of this manuscript and approved its submission.
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Use of Large Language Models, AI and Machine Learning Tools: None declared.
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Conflict of interest: The authors state no conflict of interest.
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Research funding: None declared.
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Data availability: The raw data can be obtained on request from the corresponding author.
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