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<p>Al<sub>2</sub>O<sub>3</sub>–HDPE dielectric composites were fabricated by a low-temperature pressure-assisted co-consolidation process at 120&#xa0;°C, eliminating the need for conventional ceramic sintering. Consolidation was carried out under 500&#xa0;MPa with different holding times, resulting in relative densities of approximately 85–88%. Microstructural analysis revealed a homogeneous distribution of Al<sub>2</sub>O<sub>3</sub> particles within the HDPE matrix, while X-ray diffraction confirmed the structural stability of the α-Al<sub>2</sub>O<sub>3</sub> phase after processing. FTIR results indicated preservation of the polymer structure with minor interfacial interactions between the ceramic and polymer phases. The composites exhibited frequency-dependent dielectric behavior with enhanced permittivity and low dielectric loss (~ 10<sup>−3</sup> at 2&#xa0;MHz), primarily attributed to interfacial polarization effects. Among the investigated conditions, a holding time of 60&#xa0;min provided the best dielectric performance due to improved densification and interfacial stability. These results demonstrate that low-temperature pressure-assisted co-consolidation is an effective approach for producing dielectric ceramic–polymer composites with promising properties for low-temperature electronic and embedded capacitor applications.</p>

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Dielectric response of Al2O3–HDPE composites processed by low-temperature pressure-assisted co-consolidation at 120 °C

  • 期刊论文

  • 发表日期：

    2026年7月18日

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  • Ashutosh Kumar,
  • Praveen Kumar Mudavath,
  • Brahma Raju Golla

摘要

Al2O3–HDPE dielectric composites were fabricated by a low-temperature pressure-assisted co-consolidation process at 120 °C, eliminating the need for conventional ceramic sintering. Consolidation was carried out under 500 MPa with different holding times, resulting in relative densities of approximately 85–88%. Microstructural analysis revealed a homogeneous distribution of Al2O3 particles within the HDPE matrix, while X-ray diffraction confirmed the structural stability of the α-Al2O3 phase after processing. FTIR results indicated preservation of the polymer structure with minor interfacial interactions between the ceramic and polymer phases. The composites exhibited frequency-dependent dielectric behavior with enhanced permittivity and low dielectric loss (~ 10−3 at 2 MHz), primarily attributed to interfacial polarization effects. Among the investigated conditions, a holding time of 60 min provided the best dielectric performance due to improved densification and interfacial stability. These results demonstrate that low-temperature pressure-assisted co-consolidation is an effective approach for producing dielectric ceramic–polymer composites with promising properties for low-temperature electronic and embedded capacitor applications.