Electromagnetic wave absorption performance of SiC/(NaAlSi3O8) and SiC/Al2O3 composites synthesized from high-alumina fly ash

IF 5.7 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Research Bulletin Pub Date : 2025-08-09 DOI:10.1016/j.materresbull.2025.113717

Imrana Salisu , Xiaohui Wang , Shuhua Ma , Yanjun Ou , Helong Hui

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Abstract

In this work, SiC/(NaAlSi₃O₈) and SiC/Al₂O₃ composites were successfully synthesized from high-alumina fly ash (HAFA), an industrial byproduct of coal-fired power plants, through an environmentally friendly process involving alkaline activation and carbothermal reduction at 1250–1550°C. The SiC/(NaAlSi₃O₈) composite sintered at 1250°C for 4 hours exhibited a low density of 1.41 g/cm³ and high porosity of 62%, achieving a minimum reflection loss (RLₘᵢₙ) of −57.04 dB at 12.08 GHz and a maximum effective absorption bandwidth (EABₘₐₓ) of 4.11 GHz at 2.2 mm thickness. In comparison, the SiC/Al₂O₃ composite sintered at 1400°C for 3 hours demonstrated excellent performance at reduced thickness (1.5 mm), with an RLₘᵢₙ of −43.64 dB and an EABₘₐₓ of 4.28 GHz. The outstanding electromagnetic wave absorption performances are attributed to synergistic effects, including efficient impedance matching, strong dielectric loss, dipole and interfacial polarization, and enhanced attenuation capability of the composites.

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高铝粉煤灰合成SiC/(NaAlSi3O8)和SiC/Al2O3复合材料的电磁波吸收性能

在这项工作中，以燃煤电厂的工业副产品高铝粉煤灰（HAFA）为原料，通过碱性活化和碳热还原的环保工艺，在1250-1550℃下成功合成了SiC/（NaAlSi₃O₈）和SiC/Al₂O₃复合材料。在1250℃烧结4小时的SiC/（NaAlSi₃O₈）复合材料的密度为1.41 g/cm³，孔隙率为62%，在12.08 GHz时的最小反射损耗（RL）为−57.04 dB，在2.2 mm厚度时的最大有效吸收带宽（EABₓ）为4.11 GHz。相比之下，在1400℃下烧结3小时的SiC/Al₂O₃复合材料在厚度减小（1.5 mm）时表现出优异的性能，RL为−43.64 dB， EABₓ为4.28 GHz。有效的阻抗匹配、强介电损耗、偶极子和界面极化以及增强的衰减能力是复合材料优异的电磁波吸收性能的协同效应。

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来源期刊

Materials Research Bulletin 工程技术-材料科学：综合

CiteScore

9.80

自引率

5.60%

发文量

372

审稿时长

42 days

期刊介绍： Materials Research Bulletin is an international journal reporting high-impact research on processing-structure-property relationships in functional materials and nanomaterials with interesting electronic, magnetic, optical, thermal, mechanical or catalytic properties. Papers purely on thermodynamics or theoretical calculations (e.g., density functional theory) do not fall within the scope of the journal unless they also demonstrate a clear link to physical properties. Topics covered include functional materials (e.g., dielectrics, pyroelectrics, piezoelectrics, ferroelectrics, relaxors, thermoelectrics, etc.); electrochemistry and solid-state ionics (e.g., photovoltaics, batteries, sensors, and fuel cells); nanomaterials, graphene, and nanocomposites; luminescence and photocatalysis; crystal-structure and defect-structure analysis; novel electronics; non-crystalline solids; flexible electronics; protein-material interactions; and polymeric ion-exchange membranes.