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<p>In this study, elemental copper (Cu), cobalt (Co), and boron (B) powders were mixed at various weight ratios. The powder mixtures were then consolidated via spark plasma sintering (SPS) to produce in situ cobalt boride-reinforced Cu matrix composites (CMCs). The SPS process was carried out at 900&#xa0;°C under a uniaxial pressure of 35&#xa0;MPa for 4&#xa0;minutes. The densities of the produced composites were measured using the Archimedes principle. Microstructural characterization was performed by x-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectrometry (EDS). Mechanical properties were evaluated through hardness testing and three-point bending tests. Density measurements showed that the relative density exceeded 97% in all composites and increased with higher Co and B contents. Microstructural examinations revealed that Co and B elements reacted during the SPS process to form in situ Co<sub>2</sub>B and CoB compounds. These boride phases tended to agglomerate at grain boundaries but were generally distributed homogeneously throughout the microstructure. Furthermore, increasing the reinforcement content markedly enhanced the mechanical performance of the composites, leading to an approximately 78% rise in hardness and an 81% increase in yield strength.</p>

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In Situ Synthesis and Characterization of Cobalt Boride-Reinforced Copper Matrix Composites via Spark Plasma Sintering

  • 期刊论文

  • 发表日期：

    2025年11月19日

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  • Özgür Özgün

摘要

In this study, elemental copper (Cu), cobalt (Co), and boron (B) powders were mixed at various weight ratios. The powder mixtures were then consolidated via spark plasma sintering (SPS) to produce in situ cobalt boride-reinforced Cu matrix composites (CMCs). The SPS process was carried out at 900 °C under a uniaxial pressure of 35 MPa for 4 minutes. The densities of the produced composites were measured using the Archimedes principle. Microstructural characterization was performed by x-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectrometry (EDS). Mechanical properties were evaluated through hardness testing and three-point bending tests. Density measurements showed that the relative density exceeded 97% in all composites and increased with higher Co and B contents. Microstructural examinations revealed that Co and B elements reacted during the SPS process to form in situ Co2B and CoB compounds. These boride phases tended to agglomerate at grain boundaries but were generally distributed homogeneously throughout the microstructure. Furthermore, increasing the reinforcement content markedly enhanced the mechanical performance of the composites, leading to an approximately 78% rise in hardness and an 81% increase in yield strength.