High-temperature Oxidation Mechanism and Electromagnetic Wave Absorption Properties of Fe2AlB2

doi:10.15541/jim20250218

Abstract

Abstract:

Traditional wave-absorbing materials often exhibit performance limitations at high temperatures, which makes it difficult to meet performance demands in extreme high-temperature environments. Fe₂AlB₂ has garnered significant attention in the field of high-temperature wave absorption due to its nano-layered structure and exceptional high-temperature stability. This study synthesized Fe₂AlB₂ powder through a wet ball milling process followed by sintering in an argon atmosphere. Investigation was conducted to elucidate the oxidation mechanisms and to assess the evolution of its wave-absorbing properties at elevated temperatures. Additionally, electromagnetic simulation software was utilized to model the radar cross-section associated with its absorption process under 7 GHz microwave irradiation. The results indicate that the onset oxidation temperature of Fe₂AlB₂ is 671 ℃. As the oxidation temperature increases, a dense Al₂O₃protective film forms on its surface, significantly enhancing its oxidation resistance. Beyond 1000 ℃, this Al₂O₃ film fractures, leading to transformation of the primary phases into Fe₂O₃, Al₄B₂O₉ and amorphous B₂O₃. Within the oxidation temperature range of 300-800 ℃, the wave absorption performance of the sample progressively improves with increasing oxidation temperature, exhibiting particularly outstanding dielectric loss capabilities around 10 GHz. At an oxidation temperature of 900 ℃, the sample achieves a reflection loss of -42.60 dB at a frequency of 11.28 GHz, with corresponding a thickness of 2.8 mm. The Al₂O₃ film significantly enhances dielectric loss efficiency by inducing interfacial polarization loss at the "oxide film-matrix" interface. This study elucidates that oxidation mechanisms of Fe₂AlB₂ at varying temperatures and examines consequent impacts on wave-absorbing properties, thereby providing a theoretical foundation for its application in high-temperature wave-absorbing environments.

Key words: Fe₂AlB₂, oxidation resistance, wave-absorbing property, high-temperature stability

CLC Number:

TG174

MA Xinchao, ZHI Qing, LI Wei, CHEN Mao, WANG Hailong, ZHANG Rui, ZHANG Fan, FAN Bingbing. High-temperature Oxidation Mechanism and Electromagnetic Wave Absorption Properties of Fe₂AlB₂[J]. Journal of Inorganic Materials, 2026, 41(1): 45-54.

Figures/Tables 11

Fig. 1 XRD pattern (a) and SEM image (b) of Fe2AlB2 powder

Fig. 2 XRD patterns of Fe2AlB2 powders oxidized at different temperatures for 2 h (a) 300−600 ℃; (b) 700−900 ℃; (c) 1000−1200 ℃

Fig. 3 Element analyses of Fe2AlB2 powders oxidized at different temperatures for 2 h

Fig. 4 SEM images and EDS mappings of Fe2AlB2 powders oxidized at different temperatures (a) 300 ℃; (b) 400 ℃; (c) 500 ℃; (d) 600 ℃; (e, h) 700 ℃; (f, i) 800 ℃; (g, j) 900 ℃; (k) SEM image of Fe2AlB2 powder oxidized at 900 ℃ for 2 h and (l-n) Corresponding elemental EDS mappings of (l) Al, (m) O and (n) Fe

Fig. 5 Fe2p, Al2p and B1s XPS spectra of Fe2AlB2 powders oxidized at different temperatures for 2 h (a-c) 600 ℃; (d-f) 700 ℃; (g-i) 900 ℃

Fig. 6 TG-DTG-DSC curves (a) and weight gain curve after isothermal oxidation for 2 h (b) of Fe2AlB2 powders

Fig. 7 Electromagnetic parameters of T400−T900 samples (a) ${\varepsilon }'$; (b) ${\varepsilon }''$; (c) ${\mu }'$; (d) ${\mu }''$; (e) $\tan {{\delta }_{\varepsilon }}$; (f) $\tan {{\delta }_{\mu }}$. Colorful figures are available on website

Fig. 8 3D reflection loss curves of the samples oxidized at different temperatures (a) T400; (b) T500; (c) T600; (d) T700; (e) T800; (f) T900. Colorful figures are available on website

Fig. 9 Impedance matching curves of the samples oxidized at different temperatures (a) T400; (b) T500; (c) T600; (d) T700; (e) T800; (f) T900. Colorful figures are available on website

Fig. 10 Curves of magnetic loss coefficient versus frequency for samples oxidized at different temperatures Colorful figure is available on website

Fig. 11 Three-dimensional radar scattering signals and RCS simulation curves (a) T400; (b) T500; (c) T600; (d) T700; (e) T800; (f) T900

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High-temperature Oxidation Mechanism and Electromagnetic Wave Absorption Properties of Fe₂AlB₂

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