热稳定铁基复合吸波材料的设计合成及性能研究

发布时间：2018-03-24 21:07

本文选题：羰基铁　切入点：铁基复合材料　出处：《哈尔滨工业大学》2017年硕士论文

【摘要】：随着电磁波技术的迅速发展及在国内外的广泛应用,电磁干扰、电磁污染及电磁信号泄露等问题给人们日常生产生活带来前所未有的风险,甚至威胁着人类的身体健康。近些年为解决电磁波引起的各种问题,电磁波吸收材料得到了越来越多的关注。作为商用磁性金属的羰基铁是一种具有良好发展前景的高性能吸波材料,但是羰基铁存在着热稳定差的缺点。本论文通过设计并合成一些羰基铁基复合材料来为克服羰基铁热稳定性差的缺点,并进一步探究复合材料的吸波性能。本论文设计合成了Fe@AlPO_4、Fe@C、Fe@SiO_2、Fe@SiO_2@ZrO_2四种铁基复合材料。研究表明:羰基铁具有较差的热稳定性,因而高温使羰基铁的饱和磁化强度大幅度降低。与此同时,热处理后羰基铁的复介电常数和复磁导率大幅度降低,表明高温破坏了羰基铁的介电特性和磁特性。与羰基铁相比,四种包覆材料均在一定程度上延缓了内部材料铁的氧化,提高铁基复合材料的热稳定性,其中Fe@AlPO_4复合材料的热稳定性相对最好。此外,热处理后的Fe@AlPO_4复合材料的复介电常数和复磁导率降低幅度不是很大,因而Fe@AlPO_4复合材料要比羰基铁表现更优异的吸波性能。本论文进一步优化AlPO_4包覆层的含量,探究磷酸盐包覆层含量对复合材料热稳定性和吸波性能的影响。研究表明:磷酸盐涂层不仅可以显著地提高内部材料铁的抗氧化性,并且可以调节复合材料的电磁参数,使得复合材料的阻抗更好匹配。随着磷酸盐包覆层含量的优化,Fe@AlPO_4-4复合材料展现出较为优异的反射损耗特性,在频率为5.4 GHz时达到最大反射损耗-39.9 dB,且在厚度为1.0 mm到5.0mm范围内展现出较宽的有效吸收频宽高达15.6 GHz(2.4 GHz-18.0 GHz,RL-10dB)。Fe@AlPO_4复合材料的吸波性能优于纯的羰基铁及许多已报道过的羰基铁基复合材料。更重要的是,经过24 h、48 h长时间高温处理后Fe@AlPO_4-4复合材料比羰基铁展现出持久的吸波性能。本论文为合成兼具优异吸波性能和热稳定性能的羰基铁基复合材料提供了新的思路以满足实际生产应用。
[Abstract]:With the rapid development of electromagnetic wave technology and its wide application at home and abroad, the problems of electromagnetic interference, electromagnetic pollution and electromagnetic signal leakage bring unprecedented risks to people's daily production and life. It even threatens human health. In recent years, in order to solve the problems caused by electromagnetic waves, More and more attention has been paid to electromagnetic wave absorbing materials. As a commercial magnetic metal, carbonyl iron is a kind of high performance absorbing materials with good development prospects. However, carbonyl iron has the disadvantage of poor thermal stability. In this paper, some carbonyl iron matrix composites are designed and synthesized to overcome the disadvantages of poor thermal stability of carbonyl iron. In this paper, we have designed and synthesized four kinds of iron matrix composites, Fe@ AlPO4 / Feearth @ FeSiO2FeSiO2FeSiO2ZrO20. The results show that carbonyl iron has poor thermal stability. At the same time, the complex permittivity and complex permeability of carbonyl iron are greatly reduced after heat treatment, which indicates that the dielectric and magnetic properties of carbonyl iron are destroyed at high temperature. To some extent, the four kinds of coating materials delay the oxidation of iron and improve the thermal stability of iron matrix composites, in which the thermal stability of Fe@AlPO_4 composites is the best. The decrease of complex permittivity and complex permeability of Fe@AlPO_4 composites after heat treatment is not very large, so Fe@AlPO_4 composites exhibit better absorbing properties than carbonyl iron. In this paper, the content of AlPO_4 coating layer is further optimized. The effects of phosphate coating content on the thermal stability and absorbing property of the composite were investigated. The results showed that the phosphate coating could not only significantly improve the oxidation resistance of iron, but also adjust the electromagnetic parameters of the composite. The impedance of the composite is better matched. With the optimization of the phosphate coating content, the Fer AlPO4-4 composite exhibits excellent reflectance loss characteristics. The maximum reflectance loss of -39.9 dB is achieved at a frequency of 5.4 GHz, and a wide effective absorption band width up to 15.6 GHz(2.4 GHz-18.0 GHz RL-10dBU 路Fe@ AlPO4 composite is shown to be better than pure carbonyl iron and many reports have been reported in the range of 1.0mm to 5.0mm. Carbonyl iron matrix composites. More importantly, After 24 h and 48 h of high temperature treatment, Fe@AlPO_4-4 composites exhibit durable wave absorption properties compared with carbonyl iron. This paper provides a new way of thinking for the synthesis of carbonyl iron matrix composites with both excellent absorbing and thermal stability properties. Meet the actual production application.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB34

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