Al/Cr2O3复合粉体的制备及红外反射特性研究

doi:10.3724/SP.J.1077.2013.12395

无机材料学报 ›› 2013, Vol. 28 ›› Issue (5): 545-550.DOI: 10.3724/SP.J.1077.2013.12395 CSTR: 32189.14.SP.J.1077.2013.12395

Al/Cr₂O₃复合粉体的制备及红外反射特性研究

袁乐, 翁小龙, 卢虎, 邓龙江

(电子科技大学电子薄膜与集成器件国家重点实验室, 微电子与固体电子学院, 成都 610054)

收稿日期:2012-06-25 修回日期:2012-09-04 出版日期:2013-05-10 网络出版日期:2013-04-22
作者简介:袁乐(1985–), 男, 博士研究生. E-mail: yuanle.cn@gmail.com
基金资助:
西华大学特种材料及制备省级重点实验室开放研究基金(SZJJ2009-001);装备预先研究项目(51310030103)

Preparation and Infrared Reflection Performance of Al/Cr₂O₃Composite Particles

YUAN Le, WENG Xiao-Long, LU Hu, DENG Long-Jiang

(State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China)

Received:2012-06-25 Revised:2012-09-04 Published:2013-05-10 Online:2013-04-22
About author:YUAN Le. E-mail: yuanle.cn@gmail.com
Supported by:
The Province Key Laboratory Program of Special Material and Preparation of Xihua University (SZJJ2009-001);The Weaponry Equipment Pre-research Foundation of China (51310030103)

摘要/Abstract

摘要：

采用液相沉淀法, 制备了在片状铝粉表面包覆Cr₂O₃的复合粉体颜料, 利用XRD、SEM、UV/VIS/NIR分光光度计、FTIR红外光谱仪等方法对颜料相结构、形貌、光谱及红外反射特性等进行了测试表征。结果表明, Cr₂O₃包覆层对光谱反射特性的影响随波长变化而异, 波长越短, 包覆前后反射率的变化越大。当Cr³⁺:Al摩尔比为0.2:1.0时, Al/Cr₂O₃复合颜料在可见光波段的反射率下降接近50%, 颜色明度参数L*降低15, 而8~14 μm波段红外反射率下降不到10%。分析表明, 包覆层对不同波长辐射的吸收系数以及表面粗糙度的差异导致了上述结果。该复合颜料对于低明度和光泽度的低红外发射率涂层设计有重要研究价值。

关键词: 片状铝粉, Cr₂O₃, 发射率, 明度, 包覆

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

中图分类号:

TQ637

袁乐, 翁小龙, 卢虎, 邓龙江. Al/Cr₂O₃复合粉体的制备及红外反射特性研究[J]. 无机材料学报, 2013, 28(5): 545-550.

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.

图/表 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

图1 铝粉和Al/Cr(OH)3前驱体粉体的TG曲线

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

图2 Al/Cr2O3复合粉体的XRD图谱

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

图3 Cr2O3、Al/Cr2O3和Al粉体的SEM照片

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

图4 Al颜料和Al/Cr2O3复合粉体的Vis-NIR漫反射光谱

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

图5 Cr2O3包覆量对复合粉体反射率的影响

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

图6 Cr2O3、Al/Cr2O3和Al粉体在8~14 μm波长范围的漫反射红外光谱

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

图7 片状铝粉和Al/Cr2O3复合粉体的照片

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

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Al/Cr₂O₃复合粉体的制备及红外反射特性研究

Preparation and Infrared Reflection Performance of Al/Cr₂O₃Composite Particles

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