等离子喷涂ZnO/Al_2O_3涂层微波介电特性研究  

Microwave dielectric properties of ZnO/Al_2O_3 composite coatings

作　　者：周亮[1] 罗发[1] 周万城[1] 朱冬梅[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《功能材料》2010年第10期1800-1802,共3页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50572090)

摘　　要：采用等离子喷涂工艺,以氧化锌(ZnO)作为吸收剂,氧化铝(Al2O3)为填料,聚乙烯醇(PVA)为粘结剂制备成ZnO/Al2O3复合涂层。分析了复合涂层的相组成及微观结构,研究了氧化锌含量对复合涂层介电性能的影响。结果表明,经喷涂后的涂层中有新相ZnAl2O4生成,其含量随原料中ZnO的含量增加而增加。涂层的密度与涂层中氧化锌含量有关。介电性能测试表明,涂层中ZnO含量的增加使涂层介电常数实部(ε′)及损耗(tanδ)先增加后降低。ZnO摩尔含量为65%时,随频率的增加,涂层介电常数呈降低的趋势。ZnO/Al2O3 composite coatings were prepared by plasma spray technology using ZnO powders,Al2O3 powders and PVA additives as starting materials.Phase compositions,microstructure of these coatings were analysised.And the influence of the content of ZnO in the absorbing coatings on dielectric property was investigated.The results indicate that new phase ZnAl2O4 generated in the progress of spraying,and by increasing the amount of ZnO,the counts of ZnAl2O4 increased.The density of coatings depends on the content of ZnO powders.The dielectric constant measurements revealed that when the content of ZnO increases from 60mol%to 70mol%,both the real part of permittivity and the loss change greatly over the frequency range 8.2-12.4GHz. By the increase of frequency,the permittivity decrease when the ZnO content is 65mol%,which demonstrated the strong frequency dispersion.

关 键 词：ZnO/Al2O3 等离子喷涂 介电常数 复合涂层 

分 类 号：TQ129[化学工程—无机化工]