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<p>Hafnium diboride (HfB<sub>2</sub>) is an advanced ceramic material with remarkable mechanical, thermal and electrical conduction properties. Thanks to these properties, it has a wide range of applications in aerospace, energy, and capacitor technologies. The Self-propagating High-temperature Synthesis (SHS) method offers a cost-effective alternative for producing nano-sized HfB<sub>2</sub> powders as it eliminates the need for external energy inputs beyond initiation. In this study, the HfO<sub>2</sub>- B<sub>2</sub>O<sub>3</sub>- Mg reduction system was investigated to produce HfB<sub>2</sub> by combustion synthesis. As a result of SHS experiments, Mg-based contaminations were found in the structure. Leaching process was carried out with sulfuric acid and hydrochloric acid for their removal. The system thermodynamically simulated with the Factsage 7.1 software. Thermodynamic simulation determined the optimum reaction conditions, showing that a Mg stoichiometry of 110% achieved high adiabatic temperatures (&gt; 1527&#xa0;°C) and minimized undesirable phases. The samples were characterized using XRD and SEM techniques. As the optimum result, the mixture containing 110% Mg yielded HfB₂ through a two-stage leaching process. The resulting products were obtained in nanostructured form, with an average particle size of approximately 180&#xa0;nm. This study demonstrates a scalable, energy-efficient route to produce high-purity nanostructured HfB₂ powders. This study demonstrates a scalable, energy-efficient route to produce high-purity nanostructured HfB₂ powders.</p>

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Production of Nanostructured HfB₂ by Self-Propagating High-Temperature Synthesis (SHS)

  • 期刊论文

  • 发表日期：

    2025年12月11日

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  • Serkan Baslayici

摘要

Hafnium diboride (HfB2) is an advanced ceramic material with remarkable mechanical, thermal and electrical conduction properties. Thanks to these properties, it has a wide range of applications in aerospace, energy, and capacitor technologies. The Self-propagating High-temperature Synthesis (SHS) method offers a cost-effective alternative for producing nano-sized HfB2 powders as it eliminates the need for external energy inputs beyond initiation. In this study, the HfO2- B2O3- Mg reduction system was investigated to produce HfB2 by combustion synthesis. As a result of SHS experiments, Mg-based contaminations were found in the structure. Leaching process was carried out with sulfuric acid and hydrochloric acid for their removal. The system thermodynamically simulated with the Factsage 7.1 software. Thermodynamic simulation determined the optimum reaction conditions, showing that a Mg stoichiometry of 110% achieved high adiabatic temperatures (> 1527 °C) and minimized undesirable phases. The samples were characterized using XRD and SEM techniques. As the optimum result, the mixture containing 110% Mg yielded HfB₂ through a two-stage leaching process. The resulting products were obtained in nanostructured form, with an average particle size of approximately 180 nm. This study demonstrates a scalable, energy-efficient route to produce high-purity nanostructured HfB₂ powders. This study demonstrates a scalable, energy-efficient route to produce high-purity nanostructured HfB₂ powders.