FeCo@纳米SiO_(2)的抗氧化及吸波性能  

Oxidation Resistance and Microwave Absorption of FeCo@Nano-SiO_(2)

作　　者：李晶[1] 朱颖丽 李享成[1] 陈平安[1] 朱伯铨[1] LI Jing;ZHU Yingli;LI Xiangcheng;CHEN Ping'an;ZHU Boquan(The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室,武汉430081

出　　处：《硅酸盐学报》2021年第6期1135-1142,共8页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(51972242)。

摘　　要：以正硅酸四乙酯和FeCo为原料,采用改进的Stober工艺制备了FeCo@纳米SiO_(2)。结果表明:制备粉体为均匀核壳结构;当SiO_(2)含量为35%(质量分数)时,样品的最低反射损耗(RL)在厚度为2.6 mm时达到-36.1 dB,有效吸收带宽(RL<-10 d B)为3.2 GHz;当SiO_(2)含量为65%时,样品具有最佳的抗氧化性,升温至800℃,质量增加仅2%。SiO_(2)的包覆不仅优化了FeCo的阻抗匹配,有利于电磁波吸收,而且在高温下SiO_(2)可以阻隔FeCo和氧气接触,增加其抗氧化性。FeCo@nano-SiO_(2) was prepared via a modified Stober method using tetraethyl orthosilicate using FeCo as raw materials.The results show that the powder has a uniform core-shell structure.The reflection loss(RL)of FeCo@nano-SiO_(2) reaches-36.1 d B with the thickness of 2.6 mm,and the effective absorption bandwidth with RL<-10 dB is 3.2 GHz when the content of SiO_(2) is 35%(in mass fraction).The mass of FeCo@nano-SiO_(2) only increases 2%from room temperature to 800℃,and the optimum oxidation resistance can be obtained at the content of SiO_(2) of 65%.The SiO_(2) shell optimizes the impedance matching of FeCo,further facilitating the electromagnetic wave absorption,and prevents the contact between FeCo and oxygen at a high temperature,thus improving the oxidation resistance.

关 键 词：铁钴合金@纳米二氧化硅 电磁波吸收 有效吸收带宽 抗氧化性 

分 类 号：TM25[一般工业技术—材料科学与工程]