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Ferroboron (Fe-B) alloy containing 15–17 wt.% boron finds its various commercial applications such as for the preparation of Nd-Fe-B magnets, alloying addition to steels etc. In this work, aluminothermic co-reduction of Fe2O3 and B2O3 using Al as reducing agents was studied to prepare Fe-B alloy. Differential thermal analysis (DTA) studies were conducted to elucidate the reaction mechanism of Fe2O3 and B2O3 with Al. Three exothermic peaks were observed in the DTA peaks of Fe2O3 with Al which indicated the three step reduction of Fe2O3 when reacted with Al. The B2O3-Al DTA analysis shows two exothermic peaks indicating two step reduction. A number of thermite experiments were carried out in 50 g scale by varying the exothermic heat of the reaction for achieving optimum product yield. Fe-B alloy with around 15% B content was successfully developed, as confirmed by ICP-AES analysis. SEM–EDS analysis revealed the presence of three phases in the microstructure of the thermite alloy. The nano indentation mapping of Fe-B sample showed average hardness of around 19 GPa, which was comparable with the hardness values of FeB or Fe2B phases.

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Preparation and Characterization of Low-Carbon Ferroboron Alloy by Aluminothermic Reduction of Oxides

  • 会议论文

  • 发表日期：

    2025年

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  • Shubham Kumar,
  • Sanjib Majumdar,
  • Bhaskar Paul,
  • Jugal Kishor,
  • Vivekanand Kain

摘要

Ferroboron (Fe-B) alloy containing 15–17 wt.% boron finds its various commercial applications such as for the preparation of Nd-Fe-B magnets, alloying addition to steels etc. In this work, aluminothermic co-reduction of Fe2O3 and B2O3 using Al as reducing agents was studied to prepare Fe-B alloy. Differential thermal analysis (DTA) studies were conducted to elucidate the reaction mechanism of Fe2O3 and B2O3 with Al. Three exothermic peaks were observed in the DTA peaks of Fe2O3 with Al which indicated the three step reduction of Fe2O3 when reacted with Al. The B2O3-Al DTA analysis shows two exothermic peaks indicating two step reduction. A number of thermite experiments were carried out in 50 g scale by varying the exothermic heat of the reaction for achieving optimum product yield. Fe-B alloy with around 15% B content was successfully developed, as confirmed by ICP-AES analysis. SEM–EDS analysis revealed the presence of three phases in the microstructure of the thermite alloy. The nano indentation mapping of Fe-B sample showed average hardness of around 19 GPa, which was comparable with the hardness values of FeB or Fe2B phases.