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<p>The current work covers a pyrometallurgical technique to prepare ferronickel alloy (&gt; 95% purity) by recycling spent nickel–metal hydride (Ni–MH) batteries and exploring the application side of alloy by assessing its microstructural and mechanical properties. XRD analysis confirms the presence of the γ-Fe–Ni phase, with no peaks indicating the α-Fe–Ni phase, due to the processing of the alloy at a high smelting reduction temperature. SEM micrograph also reveals relatively uniform distribution of carbon particles in the matrix. The developed alloy containing 26% nickel reveals remarkable ultimate compressive strength of 781&#xa0;MPa, which is higher than that of Invar-nickel iron alloy (725&#xa0;MPa) commonly used in cathode ray tubes. This study highlights the development of the ferronickel alloy and its properties, demonstrating a promising sustainable method for recycling spent Ni–MH batteries.</p>

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Microstructure and Mechanical Property Assessment of Ferronickel Alloy Prepared from Spent Nickel–Metal Hydride Batteries

  • 期刊论文

  • 发表日期：

    2025年5月17日

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  • Pravas Ranjan Behera,
  • Silani Sahoo

摘要

The current work covers a pyrometallurgical technique to prepare ferronickel alloy (> 95% purity) by recycling spent nickel–metal hydride (Ni–MH) batteries and exploring the application side of alloy by assessing its microstructural and mechanical properties. XRD analysis confirms the presence of the γ-Fe–Ni phase, with no peaks indicating the α-Fe–Ni phase, due to the processing of the alloy at a high smelting reduction temperature. SEM micrograph also reveals relatively uniform distribution of carbon particles in the matrix. The developed alloy containing 26% nickel reveals remarkable ultimate compressive strength of 781 MPa, which is higher than that of Invar-nickel iron alloy (725 MPa) commonly used in cathode ray tubes. This study highlights the development of the ferronickel alloy and its properties, demonstrating a promising sustainable method for recycling spent Ni–MH batteries.