偶联剂包覆片状金属磁粉电磁特性研究  

Electromagnetic Properties of Flaky Metal Magnetic Powder Coated by Coupling Agent

作　　者：谢建良[1] 陆传林[1] 邓龙江[1] 陈良[1] 

机构地区：[1]电子科技大学微电子与固体电子学院,成都610054

出　　处：《电子科技大学学报》2008年第2期293-296,共4页Journal of University of Electronic Science and Technology of China

摘　　要：利用硅烷偶联剂对片状金属磁粉进行表面包覆,采用扫描电镜、红外光谱等方法对磁粉表面硅烷膜的形貌、结构进行表征,并对包覆前后磁粉/石蜡复合材料的微波电磁参数进行了测试。结果表明偶联剂以化学键的方式吸附在磁粉表面,形成高电阻率的硅烷包覆膜。将磁粉按重量比(5:1)与石蜡复合在2～18GHz频率范围内测量介电常数,其介电常数实部和虚部与未包覆样品比较,平均下降了9左右,而对应的复磁导率变化很小。由其制备1mm厚的吸波涂层,涂层在8dB的吸收带宽由包覆前的4.3GHz增加到包覆后的8.2GHz,改善了吸收剂的吸波性能。The surface of flaky metal magnetic powders was coated by silane coupling agent. The appearance, structure and phase constitute of powders before and after treatment were characterized by SEM and RA-IR. And the powders were randomly dispersed in paraffin at a weight ratio of 5：1 for microwave electromagnetic parameters test and comparison in the frequency range of 2- 18 GHz. The results show that a high resistivity film is formed on the powders surface by chemical bonding, and the real and imaginary parts of complex permittivity of sample decrease 9 in average but corresponding complex permeability decreases slightly. The coatings with thicknesses of 1 mm give a microwave absorption of 8 dB with a band width of 8.2 GHz and microwave absorption of the coated flaky metal magnetic powders is improved.

关 键 词：金属磁粉 介电常数 硅烷偶联剂 表面包覆 

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]