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<p>Al/Al<sub>2</sub>O<sub>3</sub> is crucial encapsulation composites used in solar thermal storage systems. Al/Al<sub>2</sub>O<sub>3</sub> composites with varying SiO<sub>2</sub> and MgO contents were prepared using Al powder and Al<sub>2</sub>O<sub>3</sub> powder as raw materials, with SiO<sub>2</sub> and MgO as sintering aids, through a cold-press sintering method. The latent heat, thermal conductivity, and bending strength of the composites were measured. The microstructure of the composites and their compatibility with Al-Si (88%−12% in weight) alloy were observed and analyzed. The relationship between thermal properties, mechanical properties, compatibility, and microstructure was investigated. The results show that as the SiO<sub>2</sub> content increases and the MgO content decreases, the comprehensive performance of the composites first improves and then decreases. The composites exhibit the best comprehensive performance when the mass contents of SiO2 and MgO are both 1%, with a bending strength of 79.645 MPa, thermal conductivity of 23.903 W/(m·K), and a latent heat of 93.61 J/g. In the compatibility experiment, as the number of thermal cycles increases, the diffusion distance of Si atoms in the composite first increases and then stabilizes, maintaining a distance of approximately 150 μm, indicating good compatibility.</p>

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Effects of SiO2 and MgO on the Thermophysical and Mechanical Properties of Al/Al2O3 Composites and Their Compatibility with Al-Si Alloys

  • 期刊论文

  • 发表日期：

    2025年4月15日

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  • Zhilei Zhang,
  • Rongxin Xue,
  • Ruiying Zhang,
  • Ge Zhao,
  • Yahong Liang,
  • Suying Yan

摘要

Al/Al2O3 is crucial encapsulation composites used in solar thermal storage systems. Al/Al2O3 composites with varying SiO2 and MgO contents were prepared using Al powder and Al2O3 powder as raw materials, with SiO2 and MgO as sintering aids, through a cold-press sintering method. The latent heat, thermal conductivity, and bending strength of the composites were measured. The microstructure of the composites and their compatibility with Al-Si (88%−12% in weight) alloy were observed and analyzed. The relationship between thermal properties, mechanical properties, compatibility, and microstructure was investigated. The results show that as the SiO2 content increases and the MgO content decreases, the comprehensive performance of the composites first improves and then decreases. The composites exhibit the best comprehensive performance when the mass contents of SiO2 and MgO are both 1%, with a bending strength of 79.645 MPa, thermal conductivity of 23.903 W/(m·K), and a latent heat of 93.61 J/g. In the compatibility experiment, as the number of thermal cycles increases, the diffusion distance of Si atoms in the composite first increases and then stabilizes, maintaining a distance of approximately 150 μm, indicating good compatibility.