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<p>The effects of incorporating coal fly ash (CFA), an industrial by-product, on the preparation of Cu-based materials and their thermophysical behavior are investigated. The main constituents of CFA (wt.%) are 57.1% SiO<sub>2</sub>, 19.1% Al<sub>2</sub>O<sub>3</sub>, 9.9% Fe<sub>2</sub>O<sub>3</sub>, and 4.4% CaO. The incorporation of industrial waste was limited to 30 vol.% CFA, and the results were compared with those of pure Cu prepared under the same conditions via powder technology technique. The obtained Cu/CFA composite shows a homogeneous distribution of the CFA phase and has a density of 6.4&#xa0;g/cm<sup>3</sup>. The thermal softening of vitreous CFA promoted surface–diffusion sintering and neck growth with the copper matrix, reaching a relative density above 90% without interfacial reaction products. The thermal conductivity at 600&#xa0;°C decreased from 330.4 to 66.8 W/mK for Cu and Cu/CFA, respectively. The coefficient of thermal expansion followed a linear relationship with temperature and decreased with increasing CFA content.</p> Graphical abstract <p></p>

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Thermophysical properties of Cu metal matrix reinforced with coal fly ash particles

  • 期刊论文

  • 发表日期：

    2025年10月22日

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  • Carlos Alberto León Patiño,
  • Deisy Ramírez Vinasco,
  • Ena Athenea Aguilar Reyes,
  • Simón Valdez Medina

摘要

The effects of incorporating coal fly ash (CFA), an industrial by-product, on the preparation of Cu-based materials and their thermophysical behavior are investigated. The main constituents of CFA (wt.%) are 57.1% SiO2, 19.1% Al2O3, 9.9% Fe2O3, and 4.4% CaO. The incorporation of industrial waste was limited to 30 vol.% CFA, and the results were compared with those of pure Cu prepared under the same conditions via powder technology technique. The obtained Cu/CFA composite shows a homogeneous distribution of the CFA phase and has a density of 6.4 g/cm3. The thermal softening of vitreous CFA promoted surface–diffusion sintering and neck growth with the copper matrix, reaching a relative density above 90% without interfacial reaction products. The thermal conductivity at 600 °C decreased from 330.4 to 66.8 W/mK for Cu and Cu/CFA, respectively. The coefficient of thermal expansion followed a linear relationship with temperature and decreased with increasing CFA content.

Graphical abstract