微弧等离子喷涂碳纳米管/纳米Al_2O_3-TiO_2复合涂层的吸波性能研究  

Absorption properties of micro-plasma sprayed carbon nanotubenanostructure Al_2O_3-TiO_2 composite coatings

作　　者：华绍春[1] 王汉功[1] 汪刘应[1] 刘顾[1] 赵瑞星[1] 姚建勋[1] 

机构地区：[1]第二炮兵工程学院,西安710025

出　　处：《物理学报》2009年第9期6534-6541,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:50845039)资助的课题~~

摘　　要：将碳纳米管与纳米Al2O3-TiO2陶瓷粉末超声共混制备了碳纳米管/纳米Al2O3-TiO2复合粉末,测试了复合粉末在2—18 GHz波段的电磁参数.研究表明:随着碳纳米管质量分数的增加,碳纳米管/纳米Al2O3-TiO2复合粉末的复介电常数和损耗角不断增大.当碳纳米管质量分数和厚度增加时,复合粉末对电磁波的反射率峰值先增加后减小,而谐振频率不断向低频移动.采用微弧等离子喷涂制备了7wt%碳纳米管/纳米Al2O3-TiO2复合吸波涂层,当厚度为1.5 mm时,涂层最小反射率为-24.0 dB,当厚度为2.0 mm时,涂层小于-10 dB的频带宽为3.60 GHz,当温度为500℃高温时,1.0 mm厚的涂层最小高温反射率为-12.2 dB,小于-10 dB频带宽为2.0 GHz.复合涂层的实际厚度D与理论厚度d呈线关系:d=0.898D+0.515.Carbon nanotube-nanostructure Al2O3-TiO2 composite powders were prepared by mixing carbon nanotubes with nanostructure Al2O3-TiO2 ceramics in an ultrasonic bath.Electromagnetic parameters of the composite material were determined at 2—18GHz.The experimental results show that the complex permititivity and loss tangent of the dielectric increase as the weight content of carbon nanotubes increases.The minimum absorption value increases firstly and then dtcreases and the resonance frequency gradually moves to the low frequency and with increase of the weight content of carbon nanotubes and the thickness of composite coatings.Carbon nanotube 7wt%-nanostructure Al2O3-TiO2 composite coatings were deposited by micro-plasma spraying.The minimum absorption value for 1.5mm thick composite coatings was（-26.3dB）.The frequency range for absorption value less than（-10dB） of（2.0mm） thick composite coatings was 3.60GHz.When the 1.0mm thick composite coating was heated to（500℃）,the minimum hightemperature absorption value was（-12.2）dB and the frequency range for absorption value less than（-10）dB was（2.00）GHz.There is a linear relationship between experimental and theoretical thickness of composite coatings：d=0.898D＋0.515,where D is the experimental thickness and d is the theoretical thickness.

关 键 词：等离子喷涂 碳纳米管 纳米Al2O3-TiO2 吸波性能 

分 类 号：TB383.1[一般工业技术—材料科学与工程]