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<p>Particle agglomerates are inevitably formed in particle-reinforced Al-matrix composites, significantly affecting their mechanical properties. To address this issue, a filtration method was proposed to remove agglomerates. However, the applicability of filtration and the underlying removal mechanisms are still unclear. In this study, the effectiveness and mechanisms of TiB<sub>2</sub> agglomerate removal by ceramic foam filters (CFFs) were first investigated in the in situ TiB<sub>2</sub>/7075 composite using experimental and simulation methods. The results indicated that filtration efficiency was significantly improved by reducing the pore size of CFFs. When the pore size of CFFs was 40 PPI, more than 80 pct of large particle agglomerates (&gt; 60 <i>μ</i>m) could be removed. Attributing to the removal of particle agglomerates, the ductility of TiB<sub>2</sub>/7075 composites increased by up to 113.1 pct. Based on the experimental and simulation results, both collision and deposition capture mechanisms of agglomerates within the filter were identified, which were strongly related to the agglomerate size, melt flow velocity, and the interior structure of CFFs. A force analysis model was developed to quantitatively describe the influence of agglomerate size, melt flow velocity, and filter structure on the capture behavior of agglomerates. These findings demonstrate the capture mechanisms of particle agglomerates during filtration and offer valuable inspiration for designing more effective filters for composite materials.</p>

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Removal of TiB2 Particle Agglomerates Through Filtration in In Situ TiB2/7075 Composite: Experiments and Simulations

  • 期刊论文

  • 发表日期：

    2025年5月27日

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  • Keneng Li,
  • Qian Wang,
  • Jiwei Geng,
  • Yugang Li,
  • Peikang Xia,
  • Huanhuan Sun,
  • Dong Chen,
  • Haowei Wang

摘要

Particle agglomerates are inevitably formed in particle-reinforced Al-matrix composites, significantly affecting their mechanical properties. To address this issue, a filtration method was proposed to remove agglomerates. However, the applicability of filtration and the underlying removal mechanisms are still unclear. In this study, the effectiveness and mechanisms of TiB2 agglomerate removal by ceramic foam filters (CFFs) were first investigated in the in situ TiB2/7075 composite using experimental and simulation methods. The results indicated that filtration efficiency was significantly improved by reducing the pore size of CFFs. When the pore size of CFFs was 40 PPI, more than 80 pct of large particle agglomerates (> 60 μm) could be removed. Attributing to the removal of particle agglomerates, the ductility of TiB2/7075 composites increased by up to 113.1 pct. Based on the experimental and simulation results, both collision and deposition capture mechanisms of agglomerates within the filter were identified, which were strongly related to the agglomerate size, melt flow velocity, and the interior structure of CFFs. A force analysis model was developed to quantitatively describe the influence of agglomerate size, melt flow velocity, and filter structure on the capture behavior of agglomerates. These findings demonstrate the capture mechanisms of particle agglomerates during filtration and offer valuable inspiration for designing more effective filters for composite materials.