Enhanced Low-Frequency Electromagnetic Wave Absorption and Corrosion Resistance of Nanocoatings

Strategic Insights -

A recent study published in Ceramics International has demonstrated the effectiveness of aluminum oxide (Al2O3) nanocoatings in enhancing the low-frequency electromagnetic wave absorption and corrosion resistance of flake-shaped carbonyl iron particles (FCIPs). The research, conducted by a team of scientists from the South China University of Technology, utilized atomic layer deposition (ALD) to coat FCIPs with Al2O3, resulting in significantly improved impedance matching and low-frequency absorption.

Key Takeaways:

  • The Al2O3 nanocoating deposited via ALD improved the impedance matching and low-frequency absorption of FCIPs, achieving a minimum reflection loss (RLm;n) of -24.57 dB at a filler loading of 60 wt% (embedded in paraffin).
  • The Al2O3 coating also markededly improved corrosion resistance, increasing the corrosion potential from -0.858 to -0.573 V and the oxidation resistance temperature from 160 to 570°C.
  • The research demonstrated that ALD-grown Al2O3 nanocoatings enhance both the low-frequency microwave absorption and the long-term environmental stability of magnetic absorbers.
  • Zilong Zhang, Na Liu, Renzong Hu, Xiaoyun Gao, and Linbo Li were co-authors on the research, in addition to Zhongchen Lu.
  • The research has been peer-reviewed and published in Ceramics International.

Statistics:

  • Minimum reflection loss (RLm;n) of -24.57 dB achieved by FCIP@Al2O3 absorbers at a filler loading of 60 wt% (embedded in paraffin).
  • Corrosion potential increased from -0.858 to -0.573 V with Al2O3 coating.
  • Oxidation resistance temperature increased from 160 to 570°C with Al2O3 coating.

Sources:

  • Enhanced Low-frequency Electromagnetic Wave Absorption and Corrosion Resistance of Flaky Carbonyl Iron Particles Via Atomic Layer Deposition of Al2o3 Nanocoatings. Ceramics International, 2025;51(24):41191-41204.
  • National Natural Science Foundation of Guangdong Province, Fundamental Research Funds for the Central Universities, SOPHON-SCUT Joint Laboratory for Surface Modification Technology of Powder Materials.