CNTs-SiC/Al_2O_3-TiO_2复合涂层的制备及其性能  

Preparation and Properties of SiC-CNTs/Al_2O_3-TiO_2 Coating

作　　者：刘顾[1] 汪刘应[1,2] 陈桂明[1] 魏皖宁[1] 华绍春[1] 朱二雷[1] 

机构地区：[1]第二炮兵工程学院五系,西安710025 [2]西安交通大学电信学院,西安710049

出　　处：《无机材料学报》2011年第11期1187-1192,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金(50845039)~~

摘　　要：采用微弧等离子喷涂技术制备了CNTs-SiC/Al2O3-TiO2复合涂层,借助SEM、X射线衍射、仪热分析仪和网络分析仪对CNTs-SiC/Al2O3-TiO2涂层的组织结构、高温氧化性能、电磁特性进行了测试分析.结果表明:多功能微弧等离子喷涂枪内中心轴向送粉方式制备的CNTs-SiC/Al2O3-TiO2复合涂层的组织结构致密、孔隙率低,SiC和CNTs的物相也保留下来.CNTs-SiC/Al2O3-TiO2涂层的高温氧化性能有所提高,涂层在35～700℃升温阶段失重率为0.71wt%,700℃恒温氧化60min后失重率为0.41wt%.随着频率的增加,CNTs-SiC/Al2O3-TiO2复合粉末的介电常数的实部从17.3下降到10.3,而虚部在6.3～2.9之间,具有频散效应.制备的CNTs-SiC/Al2O3-TiO2复合涂层在一定的范围内随着涂层厚度的增加,吸波能力显著提高,其谐振频率不断向低频移动.CNTs-SiC/Al2O3-TiO2 coatings were prepared by micro-plasma spraying.Microstructure,high tem-perature oxidation resistance,complex permittivity and absorbing performance of CNTs-SiC/Al2O3-TiO2 coatings were studied.The coatings were density,low porosity.Little oxidation occurred during the spraying process.The phase of β-SiC and C were successfully retained during the plasma spraying process.The high temperature oxida-tion of CNTs-SiC/Al2O3-TiO2 composite coating is improved compared with that of CNTs.The initial weight loss temperature of CNTs-SiC/Al2O3-TiO2 composite coating is raised to 511℃.The weight loss of the sample heated from 35℃ to 700℃ is 0.71 wt%,while the weight loss of the sample held for 60 min at 700℃ is 0.41wt%.The real parts of complex permittivity of the CNTs-SiC/Al2O3-TiO2 composites decrease from 17.3 to 10.3 with the in-creasing frequency.And with increasing frequency,the real parts of complex permittivity of the composites de-crease from 6.3 to 2.9.This tendency is beneficial for the absorption of the microwave with wide frequency band.The CNTs-SiC/Al2O3-TiO2 coatings have ability of absorbing microwave.The microwave absorbing performance of the coating with thickness of 0.9 mm is pure.However,with the increase of the coating thickness,the microwave absorption properties were enhanced and the minimum reflection loss shifts to low frequency with the increase of the coating thickness.

关 键 词：微弧等离子喷涂 组织结构 高温氧化 电磁特性 

分 类 号：TG332[金属学及工艺—金属压力加工]