不同管径CNTs/Al2O3-TiO2复合吸波涂层的拉曼光谱特征及吸波性能研究

doi:10.3724/SP.J.1077.2013.12106

无机材料学报 ›› 2013, Vol. 28 ›› Issue (2): 136-140.DOI: 10.3724/SP.J.1077.2013.12106

不同管径CNTs/Al₂O₃-TiO₂复合吸波涂层的拉曼光谱特征及吸波性能研究

汪刘应^1,2, 徐卓¹, 华绍春³, 刘安明⁴, 郭秦³, 刘顾²

(1. 西安交通大学电信学院, 西安 710049; 2. 第二炮兵工程大学, 西安 710025; 3. 第二炮兵重庆军代室, 重庆 400039; 4. 二炮驻航天科技集团第一研究院, 北京 100076)

收稿日期:2012-02-23 修回日期:2012-07-04 出版日期:2013-02-10 网络出版日期:2013-01-23
基金资助:
国家自然科学基金(50845039, 51102278);新世纪优秀人才支持计划(NCET-11-0868)

Raman Spectroscopy and Microwave Absorbing Properties of CNTs/Al₂O₃-TiO₂ Composite Absorbing Coatings with Different Diameters

WANG Liu-Ying^1,2, XU Zhuo¹, HUA Shao-Chun³, LIU An-Min⁴, GUO Qin³, LIU Gu²

(1. Key Laboratory of Electronic Ceramics and Devices of Ministry of Education, Xi’an Jiaotong University, Xi’an 710049, China; 2.The Second Artillery Engineering College, Xi’an 710025, China; 3. Military Representative Office of Second Artillery in Chongqing, Chongqing 400039, China; 4. The Second Artillery Office in the 1st Research Academy of Aerospace Science and Technology Corporation, Beijing 100076, China)

Received:2012-02-23 Revised:2012-07-04 Published:2013-02-10 Online:2013-01-23
Supported by:
National Natural Science Foundation of China (50845039, 51102278);Program for New Century Excellent Talents (NCET-11-0868)

摘要/Abstract

摘要：

采用超声共混法制备了不同管径的CNTs/Al₂O₃-TiO₂复合粉末, 利用等离子喷涂技术制备了CNTs/Al₂O₃-TiO₂复合涂层, 对不同管径的CNTs/Al₂O₃-TiO₂复合粉末和喷涂后的复合吸波涂层进行了拉曼光谱分析, 等离子喷涂处理后, CNTs的拉曼光谱特征D峰和G峰强度明显增大, 随CNTs管径的增大, 复合涂层中CNTs的D峰和G峰的强度比I_D/I_G值减小, 石墨化程度提高。吸波反射率结果显示: 涂层厚度为1.0 mm的CNTs/Al₂O₃-TiO₂复合涂层的吸波效果不佳, 随着厚度的增加, 涂层的吸波性能提高。随管径的增大, 涂层厚度为1.5 mm的CNTs/Al₂O₃-TiO₂复合涂层的反射率峰值先减小后增大, 小于-5 dB频带宽逐渐减小, 小于-10 dB频带宽不断增大, 谐振频率向高频移动。涂层厚度增加到2.0 mm, CNTs/Al₂O₃-TiO₂复合涂层的反射率峰值向低频移动。

关键词: 微弧等离子喷涂, CNTs/Al₂O₃-TiO₂, 电磁特性, 拉曼光谱, 反射率

Abstract:

CNTs/AT13 composites were prepared by mixing Al₂O₃-TiO₂ ceramics (AT13) and carbon nanotubes with different diameters in an ultrasonic bath. CNTs/AT13 coatings were prepared by micro-plasma spraying. Raman spectra of CNTs/AT13 composite powders and sprayed coatings with different CNTs diameters were studied. The values of D peak to G peak of the composite coatings increased compared with CNTs/AT13 composite powders. With increasing the diameter of CNTs, the ratio of D peak to G peak of the composite coatings is smaller and the graphitization degree of CNTs was higher. The microwave absorbing properties of the sprayed CNTs/AT13 coatings with different thicknesses were investigated in the frequency range of 2-18 GHz. when the coating thickness is 1.0 mm, the microwave absorbing ability is poor. With thicker coating, the microwave absorbing ability of the CNTs/AT13 coatings are enhanced. When the coating thickness increases to 1.5 mm, with increasing of the CNTs diameters, the experimental reflectivity peak first decrease and then increase while the resonant frequency moves to the high frequency. The reflection peak of 30-50 nm CNTs/AT13 composite coating is -23.98 dB, and the frequency bandwidth for less than -5 dB and -10 dB is 6.40 GHz and 3.36 GHz, respectively. With increasing diameters of CNTs, the frequency bandwidth for less than -5 dB decrease, the frequency bandwidth for less than -10 dB increase. When the coating thickness increases to 2.0 mm, the resonant frequency of the CNTs/AT13 composite coating moves to low frequency.

Key words: micro-plasma spraying, CNTs/Al₂O₃-TiO₂, electromagnetic properties, raman spectroscopy, reflection loss

中图分类号:

TB332

汪刘应, 徐卓, 华绍春, 刘安明, 郭秦, 刘顾. 不同管径CNTs/Al₂O₃-TiO₂复合吸波涂层的拉曼光谱特征及吸波性能研究[J]. 无机材料学报, 2013, 28(2): 136-140.

WANG Liu-Ying, XU Zhuo, HUA Shao-Chun, LIU An-Min, GUO Qin, LIU Gu. Raman Spectroscopy and Microwave Absorbing Properties of CNTs/Al₂O₃-TiO₂ Composite Absorbing Coatings with Different Diameters[J]. Journal of Inorganic Materials, 2013, 28(2): 136-140.

图/表 7

Table 1 Properties of three types of carbon nanotubes

CNTs	Outer diameters /nm	Length /µm	Specific surface area /(m²·g^-1)
1	20-30	~20	>110
2	30-50	~20	>60
3	50-80	~20	>40

图1 CNTs/AT13粉末喷涂前(a)和喷涂后(b)的SEM照片

Fig. 1 SEM morphologies of CNTs/AT13 powders before plasma spraying (a) and spraying (b)

图2 不同管径碳纳米管的拉曼光谱图

Fig. 2 Raman spectra of carbon nanotubes with different diameters

Table 2 ID/IG values of three types of CNTs, CNTs/AT13 powders and coatings

Samples	20-30 nm	30-50 nm	50-80 nm
CNTs	0.697	0.699	0.446
CNTs/AT13 powder	0.827	0.719	0.512
CNTs/AT13 coating	0.793	0.664	0.355

图3 不同管径CNTs/AT13复合粉末的拉曼光谱图

Fig. 3 Raman spectra of CNTs/AT13 powders with different diameters CNTs

图4 不同管径CNTs/AT13复合涂层的拉曼光谱图

Fig.4 Raman spectra of CNTs/AT13 coatings with different diameters CNTs

图5 不同厚度的不同管径CNTs/AT13复合涂层反射率曲线

Fig. 5 Microwave reflection loss of CNTs/AT13 coatings with different thicknesses

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不同管径CNTs/Al₂O₃-TiO₂复合吸波涂层的拉曼光谱特征及吸波性能研究

Raman Spectroscopy and Microwave Absorbing Properties of CNTs/Al₂O₃-TiO₂ Composite Absorbing Coatings with Different Diameters

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