热处理对羰基铁粉磁性能和吸波性能的影响  

Effects of Heat Treatment on Magnetic and Microwave Absorbing Properties of Carbonyl Iron Powder Absorbers

作　　者：刘辉[1] 高云雷[1] 赵东林[1] 沈曾民[1] 

机构地区：[1]北京化工大学碳纤维及功能高分子教育部重点实验室

出　　处：《安全与电磁兼容》2010年第6期71-74,共4页Safety & EMC

基　　金：国家自然科学基金(50672004);国家高技术研究发展计划(863计划)资助项目(2008AA03Z513)

摘　　要：为了改善羰基铁粉的微观结构和吸波性能,对羰基铁粉吸收剂在氮气氛下进行了热处理,热处理温度为300℃,热处理时间为30 h,研究了羰基铁粉的磁性能和在2～18 GHz的吸波性能。以热处理前后羰基铁粉作为吸收剂制备了单层吸波涂层,涂层的厚度为1.2 mm时,热处理羰基铁粉吸波涂层在10.2～15.4 GHz反射率R小于-10 dB,反射率小于-10 dB的频宽为5.2 GHz,反射率小于-5 dB的频宽为10 GHz;最大吸收峰在12.8 GHz,反射率R为-22.68 dB。磁性能研究表明,热处理后随着矫顽力的增加,在2～18 GHz羰基铁粉的微波吸收峰向高频移动,而且吸收峰变宽,吸波性能得到大幅提高。The carbonyl iron powder absorbers were heat-treated in nitrogen atmosphere at 300 ℃ for 30 hours,in order to improve their microstructure and microwave absorbing property.The magnetic and microwave absorbing properties of the carbonyl iron powder absorbers at the frequency range of 2～18 GHz were investigated.The single-layer microwave absorbing coatings employing absorbent of carbonyl-iron powder with epoxy resin as matrix have been prepared.The reflection loss of the single-layer microwave absorbing coating containing heat-treated carbonyl iron powder absorber with a thickness of 1.2 mm is below-10 dB（90% absorption） in the range of 10.2～15.4 GHz,and the minimum value is-22.68 dB at 12.8 GHz.The bandwidths corresponding to the reflection loss below-10 dB and-5 dB are 5.2 GHz and 10 GHz,respectively.The microwave absorbing peak of the carbonyl iron powder/epoxy coating moved to the higher frequency after heat-treatment,and the microwave absorbing bandwidths were broadened.

关 键 词：羰基铁粉 热处理 磁性能 雷达吸波材料 

分 类 号：TM25[一般工业技术—材料科学与工程]