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<p>This study explores the influence of SiC weight fraction and Field-Assisted Sintering Technology/Spark Plasma Sintering (FAST/SPS) parameters on the microstructure and thermal performance of Al–SiC composites. Composites containing 70 wt% and 90 wt% SiC were consolidated at temperatures ranging from 600&#xa0;°C to 2150&#xa0;°C, under compaction pressures of 80–100&#xa0;MPa and heating rates between 25 and 100&#xa0;°C/min. X-ray diffraction revealed the presence of Al, SiC, Al₂O₃, and secondary phases such as Al₄C₃ and Si. The highest relative density (98.65%) was achieved in the 90 wt% SiC sample sintered at 2100&#xa0;°C under 100&#xa0;MPa. Microstructure analysis showed a heterogeneous microstructure with residual porosity. Thermal characterization indicated that increasing density improved thermal conductivity and specific heat capacity, while the coefficient of thermal expansion (CTE) decreased with increasing SiC content. The results demonstrate that precise control of FAST/SPS parameters enables optimization of densification and thermal properties in Al–SiC composites for potential use in high-performance structural applications.</p>

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Optimizing FAST/SPS parameters for ultra-high SiC content Al–SiC composites: thermal performance and microstructural insights

  • 期刊论文

  • 发表日期：

    2026年1月12日

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  • Anna Wąsik,
  • Marcin Madej,
  • Rafał Rubach,
  • Agata Strojny-Nędza,
  • Marcin Chmielewski,
  • Dariusz Garbiec,
  • Beata Leszczyńska-Madej

摘要

This study explores the influence of SiC weight fraction and Field-Assisted Sintering Technology/Spark Plasma Sintering (FAST/SPS) parameters on the microstructure and thermal performance of Al–SiC composites. Composites containing 70 wt% and 90 wt% SiC were consolidated at temperatures ranging from 600 °C to 2150 °C, under compaction pressures of 80–100 MPa and heating rates between 25 and 100 °C/min. X-ray diffraction revealed the presence of Al, SiC, Al₂O₃, and secondary phases such as Al₄C₃ and Si. The highest relative density (98.65%) was achieved in the 90 wt% SiC sample sintered at 2100 °C under 100 MPa. Microstructure analysis showed a heterogeneous microstructure with residual porosity. Thermal characterization indicated that increasing density improved thermal conductivity and specific heat capacity, while the coefficient of thermal expansion (CTE) decreased with increasing SiC content. The results demonstrate that precise control of FAST/SPS parameters enables optimization of densification and thermal properties in Al–SiC composites for potential use in high-performance structural applications.