中文摘要：

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。

英文摘要：

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.