摘要
具有较高磁导率和饱和磁化强度FeSiAl合金(FSA)粉末在微波吸收材料中占据重要地位,但较差的抗盐雾腐蚀性能限制其在极端环境(海洋和湿热等)中的进一步应用。为此,采用Stober工艺和催化化学气相沉积技术依次在FSA表面原位沉积SiO_(2)和碳层而获得了多壳层FSA@SiO_(2)@C复合结构,并研究其耐蚀电磁性能。结果表明,SiO_(2)层和碳层均匀地包覆于FSA表面,并与基体紧密结合,SiO_(2)层厚度约为100 nm,碳层厚度约为5 nm。SiO_(2)@C多壳层结构将FSA的腐蚀速率从2.66×10^(-12) m/s降低至1.52×10^(-12) m/s,显著提升了FSA的抗盐雾腐蚀性能。当匹配厚度为3 mm时,FSA@SiO_(2)@C复合结构的吸收性能相较于FSA明显提升,吸收带宽从4.2 GHz拓宽到5.84 GHz,RL_(min)为-21.65 dB(7.41 GHz),小于纯FSA的-19.03 dB(5.93 GHz)。多壳层复合结构可显著提升FSA的耐蚀和微波吸收性能,为抗腐蚀、高效吸波多功能磁性金属吸波材料提供了一条可行的设计思路。
FSA powder is of crucial importance to microwave absorption material because of the higher magnetic permeability and saturation magnetization.However,poor resistance to salt spray corrosion limits its further application in extreme environment(marine and damp heat,etc.).Therefore,SiO_(2) and carbon layers were in situ deposited on FSA surface by the Stöber process and catalytic chemical vapor deposition technology to form FSA@SiO_(2)@C composite structure.Furthermore,the anti-corrosion electromagnetic properties of the composite were studied by network vector analyzer and electrochemical test.The results show that SiO_(2) and carbon layers are uniformly coated on the surface of the FSA and tightly combined with it.The thickness of the SiO_(2) is about 100 nm,and the thickness of the carbon is about 5 nm.The SiO_(2)@C reduces the corrosion rate of FSA from 2.66×10^(-12) m/s to 1.52×10^(-12) m/s,which significantly improves the corrosion resistance of FSA in salt spray environment.When the matching thickness is 3 mm,the microwave absorption properties of FSA@SiO_(2)@C is significantly improved compared with FSA.The absorption bandwidth is expanded from 4.2 GHz to 5.84 GHz,and the RL_(min) reaches as low as -21.65 dB(7.41 GHz),which is less than-19.03 dB(5.93 GHz)of pure FSA.The multi-shell composite structure can significantly improve the corrosion resistance and microwave absorption performance of FSA,and provides a feasible design idea for the multi-functional magnetic metal microwave absorbing materials with anti-corrosion and high efficiency.
作者
郭阳
张丽
陆海鹏
邓龙江
Guo Yang;Zhang Li;Lu Haipeng;Deng Longjiang(School of Electrical and Information Engineering,University of Panzhihua,Panzhihua 617000,China;Nation Engineering Research Center of Electromagnetic Control Materials,School of Electronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu 610054,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2022年第6期2280-2287,共8页
Rare Metal Materials and Engineering
基金
国家自然科学基金(51972046)。
