Preparation and Infrared Reflection Performance of Al/Cr2O3 Composite Particles

doi:10.3724/SP.J.1077.2013.12395

Abstract

Abstract:

The composite pigments were prepared by co-precipitation coated Cr₂O₃ on the surface of flake aluminum powders. Phase structure, surface morphology and reflectance spectra of the composite pigment were characterized by XRD, FE-SEM, UV/VIS/NIR spectroscopy and Fourier transform infrared spectrometer. The result shows that the influence of cover treatment with Cr₂O₃ on the reflectance spectra at various radiation wavelengths is different. The shorter the wavelength is, the stronger the influence is. When the molar ratio of Cr³⁺to Al is 0.2:1.0, compared with the uncoated flake aluminum powders, its average reflectance of visible spectrum and brightness (L*) drop to 50% and 15, respectively. However, the infrared emissivity of 8-14 μm waveband increases less than 10%. It mainly ascribes to the difference of surface roughness and absorption coefficient for different radiation wavelengths. Thus, the composite particles play a vital role in designing the low infrared emissivity coating.

Key words: flake aluminum, Cr₂O₃, emissivity, brightness, coating

CLC Number:

TQ637

YUAN Le, WENG Xiao-Long, LU Hu, DENG Long-Jiang. Preparation and Infrared Reflection Performance of Al/Cr₂O₃Composite Particles[J]. Journal of Inorganic Materials, 2013, 28(5): 545-550.

Figures/Tables 9

Table 1 Compositions of the raw materials

Samples	n(Cr³⁺): n(Al)	Composition/g			Precipitant/g
Samples	n(Cr³⁺): n(Al)	Flake Al	Cr(ON₃)₃·9H₂O	SDBS	NH₃·H₂O (25wt%)
S1	1:0	0	16	1.12	16.32
S2	1:1	1.08	16	1.12	16.32
S3	0.4:1.0	2.70	16	1.12	16.32
S4	0.2:1.0	5.40	16	1.12	16.32
S5	0.1:1.0	10.8	16	1.12	16.32

Fig. 1 TG curves of Al pigment and Al/Cr(OH)3 precursor

Fig. 2 XRD patterns of the Al/Cr2O3 composite powders

Fig. 3 SEM photographs of Cr2O3, Al/Cr2O3 and Al powders

Fig. 4 Diffuse reflectance Vis-NIR spectra of Al and Al/Cr2O3 powders

Fig. 5 The effects of Cr2O3 coating on the reflectance of the Al/Cr2O3 powders

Fig. 6 Diffuse reflectance IR spectra of Cr2O3, Al/Cr2O3 and Al powders in 8~14 μm waveband

Table 2 Emissivity and brightness of Al/Cr2O3 powders

Samples	S1	S2	S3	S4	S5	Al
ε_8-14μm	0.93	0.71	0.67	0.57	0.56	0.52
CIE L*	21.0	47.7	54.0	62.3	72.1	77.1

Fig. 7 Photo of flake Al powder and Al/Cr2O3 compositepowder (×20)

References 16

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Preparation and Infrared Reflection Performance of Al/Cr₂O₃Composite Particles

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