表面改性对铁基非晶合金微波吸收性能的影响  

Effect of Surface Modification on the Microwave Absorption Properties of Iron-based Amorphous Alloys

作　　者：钟宇峰 殷陶[1] 曾国勋[1] 吴起白[1] 张海 舒畅[1] ZHONG Yufeng;YIN Tao;ZENG Guoxun;WU Qibai;ZHANG Hai;SHU Chang(School of Materials and Energy,Guangdong University of Technology,Guangzhou 510000,China)

机构地区：[1]广东工业大学材料与能源学院,广州510000

出　　处：《表面技术》2024年第12期230-239,共10页Surface Technology

基　　金：广东省自然科学基金(面上项目)(2019A1515011379)。

摘　　要：目的旨在调节铁基非晶合金(IAA)粉体复合材料的微波吸收性能。方法先在铁基非晶合金粉体表面采用磁控溅射局部覆盖铝膜,再使用KH560硅烷偶联剂对粉体进行绝缘包覆。通过XRD、SEM和FT-IR分别对粉体进行材料表征,采用VSM和传输反射法分别测试样品的电磁性能。结果镀铝后铁基非晶合金粉体的复介电常数实部εʹ提高了56.1%,复介电常数虚部εʺ提高了132.4%。绝缘包覆后铁基非晶合金粉体的εʹ降低变为铁基非晶合金的32.6%,εʺ变为铁基非晶合金的25.1%。镀铝再包覆KH560的铁基非晶合金粉体的εʹ和εʺ则分别变为铁基非晶合金的43.5%和36.6%,其复介电常数实部和虚部比镀铝后的样品低,比单纯用KH560包覆后的样品高,显示出镀铝可补偿因KH560绝缘包覆而带来的介电损耗能力下降,有利于调节KH560绝缘包覆的粉体材料的电磁性能。结论对铁基非晶合金粉体的绝缘包覆,改善了相应材料的高频吸收性能,但牺牲了其低频吸收性能,为了弥补这个不足,提出在铁基非晶合金粉体表面局部覆盖铝膜,再进行绝缘包覆,期望在绝缘包覆后,粉体仍有较高的介电损耗能力,达到调节材料中低频电磁波吸收能力的目的。样品模拟反射率曲线显示,样品厚度在2~3 mm时,铁基非晶合金/Al/KH560样品最低峰对应频率低于铁基非晶合金/KH560的相应峰位,铁基非晶合金粉体表面镀铝可明显改善其复合材料的低频微波吸收特性。The work aims to regulate the microwave absorption performance of iron-based amorphous alloy(IAA)powder composite materials.The magnetron sputtering was used to partially cover an aluminum film on the surface of iron-based amorphous alloy powder,and then KH560 silane coupling agent was adopted to insulate and coat the powder.The powder was characterized by XRD,SEM,and FT-IR,and the electromagnetic properties of the samples were tested by VSM and transmission reflection methods.The real part of the complex dielectric constantεʹof iron-based amorphous alloy powder after aluminum plating increased by 56.1%,and the imaginary part of the complex dielectric constantεʺincreased by 132.4%.Theεʹof iron-based amorphous alloy powder after insulation coating decreased and was 32.6%of that of iron-based amorphous alloy andεʺwas 25.1%of that of iron-based amorphous alloy.Theεʹandεʺof iron-based amorphous alloy powder plated with aluminum and coated with KH560 were 43.5%and 36.6%of those of iron-based amorphous alloy,respectively.The real and imaginary parts of the complex dielectric constant were lower than those of the sample after aluminum plating,and higher than those of the sample after pure KH560 coating,showing that aluminum plating could compensate for the decrease in dielectric loss caused by KH560 insulation coating,which was beneficial for adjusting the electromagnetic properties of the KH560 insulation coated powder material.The insulation coating of iron-based amorphous alloy powder improves the high-frequency absorption performance of the corresponding material,but sacrifices its low-frequency absorption performance.To make up for this deficiency,it is proposed to cover the surface of iron-based amorphous alloy powder with aluminum film locally,and then conduct insulation coating.It is expected that after insulation coating,the powder still has high dielectric loss ability,achieving the goal of regulating the low-frequency electromagnetic wave absorption ability of the material.The simulated reflectanc

关 键 词：铁基非晶合金 磁控溅射 镀铝 硅烷偶联剂 微波吸收 

分 类 号：TB34[一般工业技术—材料科学与工程]