SiO_2包覆对片状金属磁粉微波介电常数的影响  

Effect of SiO_2 on Complex Permittivity of Flaky Metal Magnetic Powder/SiO_2 Composites with Core-shell Structure

作　　者：谢建良[1] 陆传林[1] 邓龙江[1] 

机构地区：[1]电子科技大学电子薄膜与集成器件国家重点实验室,成都610054

出　　处：《材料导报》2007年第F05期193-194,197,共3页Materials Reports

基　　金：国防预研基金(51410010204DZ002)

摘　　要：对片状金属磁性微粉进行表面改性,获得金属磁粉/SiO2核-壳结构复合粒子。用SEM对磁粉表面SiO2纳米粒子膜的形貌进行表征,并研究了共溶剂类型、加料工艺等因数对二氧化硅包覆膜的影响以及正硅酸乙酯(TEOS)用量对金属磁粉/SiO2复合粒子电磁参数的影响。结果表明以异丙醇为共溶剂,采用逐滴滴加TEOS的方式获得的SiO2包覆膜比较致密均匀;SiO2纳米粒子吸附在磁粉表面,形成高电阻率的包覆膜,导致其介电常数下降。The surface of flaky metal magnetic powders is modified by SiO2. The appearances of powders before and after treatment are characterized by SEM. The influence of cosolvents and way on SiO2 film and the effect of TEOS quantity on electromagnetic parameters are investigated. The results show that a close and uniform film, which is benefit for complex permittivity decreasing,can be formed in the powders surface in isopropanol by dripping TEOS.

关 键 词：金属磁性微粉 SIO2 表面改性 介电常数 

分 类 号：TB333[一般工业技术—材料科学与工程] TM25[电气工程—电工理论与新技术]