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无机材料学报

无机材料学报 ›› 2011, Vol. 26 ›› Issue (3): 239-243.DOI: 10.3724/SP.J.1077.2011.00239

• 研究论文 • 上一篇    下一篇

微弧等离子喷涂碳纳米管/纳米 Al2O3-TiO2 复合涂层高温性能研究

汪刘应1,2, 徐 卓1, 华绍春2, 刘 顾2   

  1. 1. 西安交通大学 电信学院,西安710049; 2. 第二炮兵工程学院, 西安 710025
  • 收稿日期:2010-06-02 修回日期:2010-07-15 出版日期:2011-03-20 网络出版日期:2011-02-18
  • 作者简介:汪刘应(1971-), 男, 博士, 副教授.
  • 基金资助:

    国家自然科学基金(50845039)

High Temperature Performanceof Micro-plasma Sprayed CNTs/ Al2O3-TiO2Composite Coating

WANG Liu-Ying1,2, XU Zhuo1, HUA Shao-Chun2, LIU Gu2   

  1. 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
  • Received:2010-06-02 Revised:2010-07-15 Published:2011-03-20 Online:2011-02-18
  • Supported by:

    National Natural Science Foundation of China (50845039)

PDF (PC)

1776

被引次数

8

摘要： 采用等离子喷涂技术制备了5wt% CNTs/Al2O3-TiO2复合涂层, 借助SEM、热红联仪和RAM反射率测试系统对CNTs/ Al2O3-TiO2复合涂层的组织结构、高温氧化性能、电磁特性进行了分析. 结果表明:CNTs/Al2O3-TiO2复合涂层的组织结构致密、孔隙率低, CNTs分散均匀, 碳纳米管与Al2O3-TiO2陶瓷粘结剂之间具有良好的界面相容性. 在20~700℃高温氧化过程中, CNTs起始失重温度为471.29℃, CNTs/Al2O3-TiO2复合涂层的高温氧化性能有一定提高, 起始失重温度从471.29℃提高到507.8℃, 而碳纳米管的失重率从100%下降到33.68%. CNTs/Al2O3-TiO2复合涂层具有较好的高温吸波性能, 25℃时复合涂层的反射率峰值为-7.86dB. 随温度的升高, CNTs/Al2O3-TiO2复合涂层的反射率峰值不断减小, 谐振频率向低频移动, 300℃时复合涂层的反射率峰值为-12.88dB, 小于-5dB频带宽为4.48GHz.

关键词: 微弧等离子喷涂, CNTs/Al2O3-TiO2, 高温性能, 电磁特性

Abstract: 5wt% CNTs/Al2O3-TiO2 coatings were prepared by micro-plasmaspraying. Microstructure and high temperature properties of CNTs/Al2O3-TiO2 composite coatings were studied. Its microstructure was dense and the porosity was low. CNTs were dispersed uniformly in CNTs/Al2O3-TiO2 composite coating. In the thermal oxidation processfrom 20℃ to 700℃, the initial weight loss temperature of CNTs was 471.29℃. Theinitial weight loss temperature of CNTs/Al2O3-TiO2 composite coating was raised to 507.8℃. The plasma heating process improved the graphite phase transformation of CNTs,which was helpful for the improvement of initial weight loss temperature of CNTs/Al2O3-TiO2 composite coating. When CNTs/Al2O3-TiO2 composite coating was heated to 300℃, and the high temperature reflectivity was measured at 2-18 GHz, the minimum reflection losswas -7.86 dB at 25 ℃. With increasing temperature, the reflectivity peak continuously decreased and the resonant frequency moved to the low frequency. The experimental reflectivity peak was -12.88dB, and the frequency band width for less than -5dB was 4.48 GHz at 300℃. There sults suggests that CNTs/Al2O3-TiO2 coating is agood candidate for high-temperature microwave-absorbing material.

Key words: micro-plasmaspraying, CNTs/Al2O3-TiO2, high temperature performance, electromagneticproperty

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