摘要
研究将氢氧化铁和可膨胀石墨粉末混合均匀,在高温下迅速膨化,制备得到了一种具有导电和亚铁磁性的电磁屏蔽功能微集料,将功能微集料与ABS树脂复合,制备得到了一种对电磁波具有反射和吸收功能的复合材料。利用XRD、SEM对功能微集料物相和形貌进行了分析,并对样品的电磁屏蔽传输系数曲线、最大电磁屏蔽效能及屏蔽机理进行了探讨,分析了石墨及氧化铁-石墨功能微集料含量对复合材料低频电磁屏蔽效能的影响。实验结果表明,随着膨化温度升高,氧化铁粒子在膨胀石墨表面、褶皱和沟壑中的分散性逐渐提高,粒径逐渐变小;在1MHz^1.8GHz低频范围内,氧化铁-石墨填充ABS复合材料的电磁屏蔽性能优于柔性石墨/ASB复合材料的电磁屏蔽性能,且其屏蔽方式兼有电损耗和磁损耗机制。
In this research,the graphite embedded with magnetism particles and composite plastic with low reflection and high absorbing were prepared,the component and surface microcosmic morphology of powers respectively were analyzed by XRD and SEM.On the basis of the above,the electromagnetic shielding transmit modulus curves,SEmax and the mechanism of electromagnetic shielding were systemically discussed,and the effect of content of functional composite powers on electromagnetic shielding effectiveness in low frequency also was analyzed.The experimental results showed that according to the increasing of temperature,the dispersing of ferric oxide powers in expanded graphite gradually improved,and the size of particles gradually became small.In the frequency range of 1MHz-1.8GHz,the electromagnetic shielding effectiveness of composite materials containing graphite embedded with magnetism particles was superior to composite materials containing expanded graphite powers,even in the case that reflection and absorbing are the dominant mechanism of shielding.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2008年第2期202-204,共3页
Journal of Functional Materials
基金
国家高技术研究发展计划(863计划)资助项目(2001AA322070)
青年教师奖资助项目(2002383405)
关键词
氧化铁
膨胀石墨
功能微集料
电磁屏蔽
ferric oxide
expanded graphite
functional composite powers
electromagnetic interference shielding
