膨胀石墨/金属网/ABS复合材料电磁屏蔽性能的研究  

Research on electromagnetic shielding of expanded graphite/metal net/ABS electromagnetic shielding composites

作　　者：杨玉山[1] 董发勤[2] 郑凯[2] 

机构地区：[1]西南科技大学核废物与环境安全国防重点学科实验室,四川绵阳621010 [2]西南科技大学教育部固体废弃物处理与资源化重点实验室,四川绵阳621010

出　　处：《功能材料》2013年第7期966-969,共4页Journal of Functional Materials

基　　金：四川省科技支撑计划基金资助项目(2008GZ0183)

摘　　要：以膨胀石墨(EG)和金属网(MN)作为电磁屏蔽基元材料与ABS树脂采用共混、挤出、热压等成型工艺制备了电磁屏蔽复合材料,研究了膨胀石墨的含量、处理方式、复合材料的厚度和金属网的目数对电磁屏蔽复合材料屏蔽性能的影响。结果表明,在膨胀石墨/ABS电磁屏蔽复合材料中,其电磁屏蔽效能随着膨胀石墨含量增加及复合材料厚度增加而增大,膨胀石墨经超声处理后,可以提高复合材料的屏蔽效能。在两种单层金属网/ABS电磁屏蔽夹层复合材料中,屏蔽效能并不随着金属网目数增加而增大。在30MHz～1.8GHz频率范围内,200目不锈钢网/ABS复合材料和100目铜网/ABS复合材料的屏蔽性能最好,最大屏蔽效能分别为76.1和70dB。在多相电磁屏蔽复合材料中,膨胀石墨/不锈钢网/ABS复合材料的屏蔽效能比不锈钢网/ABS复合材料高约5dB。Expanded graphite and metal net as unit for electromagnetic shielding was added to ABS resin,the electromagnetic shielding composites was prepared by blending,extrusion and injection molding process.The influence of content of expanded graphite,composite material thickness and mesh number of metal net on shielding effectiveness of composites was studied.The results show that shielding effectiveness of composites gradually augmented with the increase of expanded graphite＇s content and composite material thickness in expanded graphite/ABS electromagnetic shielding composites,and shielding effectiveness of composites was increased by added expanded graphite after ultrasonic treatmented.Shielding effectiveness didn＇t increases with the increase of mesh number of metal net for metal net/ABS electromagnetic shielding composites.Shielding effectiveness is better added 200mesh stainless steel and 100mesh bronze for single layer metal net/ABS composites,the maximum shielding effectiveness up to 76.1 and 70dB in 30MHz-1.8GHz frequency range.Shielding effectiveness of expanded graphite/stainless steel net/ABS composites highed about 5dB than stainless steel net/ABS composites in multiphase electromagnetic shielding composites.

关 键 词：膨胀石墨 金属网 电磁屏蔽效能 复合材料 

分 类 号：TB34[一般工业技术—材料科学与工程]