Corrosion Resistance and Wave Absorbing Property of Carbonyl Iron Powder Coating with Alumina by Atomic Layer Deposition

doi:10.15541/jim20160558

Abstract

Abstract:

To improve the corrosion resistant capability and electromagnetic performance of carbonyl iron powders (CIPs), alumina thin films were coated on carbonyl iron powder by atomic layer deposition (ALD) using trimethylaluminum and water as precursors. Original and modified carbonyl iron powder was characterized comprehensively via scanning electron microscope (SEM), transmission electron microscope (TEM), thermogravimetric analyzer (TGA), Fourier Transform infrared spectroscope (FTIR), and vector network analyzer. The results indicated that nano-alumina films were conformably grown on the surface of carbonyl iron powders via ALD, forming an excellent core-shell CIP/alumina structure. Compared to the original sample, thermal stability and corrosion resistance of the modified carbonyl iron powders were greatly improved. Antioxidation capability of CIPs was found enhanced with the increase of alumina coating thickness, and the maximum antioxidation temperature can exceed 550℃. It was also found that the complex permittivity of core-shell CIP/alumina decreased greatly while the complex permeability was almost the same. Therefore, the electromagnetic parameters and microwave absorption properties of the modified CIPs was also improved.

Key words: atomic layer deposition, carbonyl iron powder, alumina, wave absorbing materials, corrosion resistant

CLC Number:

TB33

LIU Yan-Feng, LI Lei-Xiao, WANG Yun-Yu, LI Chang-Feng. Corrosion Resistance and Wave Absorbing Property of Carbonyl Iron Powder Coating with Alumina by Atomic Layer Deposition[J]. Journal of Inorganic Materials, 2017, 32(7): 751-757.

Figures/Tables 9

Fig. 1 Schematic diagram of reaction pulse during ALD

Fig. 2 SEM images of CIP(a) and CIP/Al2O3(b); (c-h) TEM and EDS of CIP/Al2O3

Fig. 3 FTIR spectra of (a) CIP and (b) CIP/Al2O3

Fig. 4 Mass fraction of alumina in CIP/Al2O3 composites after different cycles of ALD deposition

Fig. 5 TG curves of CIP and CIP/Al2O3

Fig. 6 The corrosion test of CIP and CIP /Al2O3 in 0.2 mol/L HCl(a) 2 min; (b) 20 min; (c) 15 h

Fig. 7 Complex permittivity and permeability relative to the frequency for paraffin mixture of CIP and CIP /Al2O3

Fig. 8 Microwave reflection loss of paraffin mixture for CIP and CIP /Al2O3 (2.5 mm)

Fig. 9 Schematic diagram of electromagnetic wave absorption of CIP (a) and CIP/Al2O3 composites (b)

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