【摘要】：離心霧化法是商業(yè)生產(chǎn)中普遍使用的一種大批量合金微粉生產(chǎn)方法,具備生產(chǎn)效率高、微粉顆粒均勻、生產(chǎn)成本低的優(yōu)點,但一般的霧化法制備的微粉顆粒為球形。而作為電磁波吸收劑所使用的合金粉末來說,較大的長徑比能增加材料的吸收性能。根據(jù)這一需求本論文設(shè)計制作了一套離心霧化設(shè)備,并用該設(shè)備制備了橢球形和球形的Fe90Si10、Fe80Si20和Fe70Si30合金粉。利用X射線衍射儀(X-ray diffraction, XRD)掃描電子顯微鏡(Scanning electronic microscope, SEM)和矢量網(wǎng)絡(luò)分析儀(Vector network analysis)等檢測儀器對其相結(jié)構(gòu)、微觀形貌及電磁特性進(jìn)行了表征,并研究了其電磁波吸收性能。研究結(jié)果表明： 橢球形和球形的Fe90Si10、Fe80Si20和Fe70Si30合金粉分別主要由體心立方的α-Fe、Fe1.34Si0.66化合物和FeSi化合物相所組成。其復(fù)介電常數(shù)實部隨著硅含量的增加先增大后減小,虛部保持在0.2左右。復(fù)磁導(dǎo)率Fe90Si10合金粉的明顯高于其余兩者。增加粉體填充率,能有效地增大復(fù)介電常數(shù)實部和磁導(dǎo)率虛部。在所測試的厚度分別為2mm、3mm和4mm試樣中,成分為Fe90Si10的合金粉吸收頻帶更寬,在整個測試頻段內(nèi)的吸波性能明顯優(yōu)于其他兩種成分的合金粉。且較大的填充率,能獲得較好的吸收性能。 本論文所制備的Fe90Si10合金粉與市售球形Fe91Si9合金粉相比,無論是電磁性能還是微波吸收性能都要明顯優(yōu)于市售球形Fe91Si9合金粉。羰基鐵分別與市售Fe91S19、Fe91.2Si3.1P2.9Sb2.8和自制Fe90Si10的粉末按不同比例混合制備成復(fù)合粉末,所制備的復(fù)合粉末具有優(yōu)良的微波吸收性能。當(dāng)兩種粉末質(zhì)量比為1：1時,吸收性能最佳。產(chǎn)生這種優(yōu)良的吸收性能主要因素是：適當(dāng)比例的兩種粉末混合后,電磁匹配性能提高。
[Abstract]:Centrifugal atomization is a widely used method in commercial production, which has the advantages of high production efficiency, uniform micro-powder particles and low production cost, but the micro-powder particles prepared by general atomization method are spherical. For the alloy powder used as electromagnetic wave absorbent, the larger aspect ratio can increase the absorption property of the material. According to this demand, a set of centrifugal atomization equipment was designed and made, and ellipsoidal and spherical Fe90Si10,Fe80Si20 and Fe70Si30 alloy powders were prepared with the equipment. The phase structure, microstructure and electromagnetic properties of the system were characterized by X-ray diffractometer (X-ray diffraction, XRD) scanning electron microscope (Scanning electronic microscope, SEM) and vector network analyzer (Vector network analysis). The results show that the ellipsoidal and spherical Fe90Si10,Fe80Si20 and Fe70Si30 alloy powders are mainly composed of 偽 -Fe Fe 1.34Si 0.66 compound and FeSi compound phase, respectively. The real part of the complex permittivity increases first and then decreases with the increase of silicon content, and the imaginary part remains about 0.2. The complex permeability of Fe90Si10 alloy powder is obviously higher than that of the other two. Increasing the powder filling ratio can effectively increase the real part of the complex permittivity and the imaginary part of the permeability. The absorption band of the alloy powder with the composition of Fe90Si10 is wider than that of the alloy powder with the thickness of 2 mm ~ 3 mm and 4mm, respectively, and the absorbing property of the alloy powder in the whole test frequency band is obviously better than that of the alloy powder with the other two components. The better absorption property can be obtained with high filling ratio. Compared with the spherical Fe91Si9 alloy powder prepared in this paper, the electromagnetic properties and microwave absorption properties of the Fe90Si10 alloy powder are obviously superior to those of the spherical Fe91Si9 alloy powder sold on the market. The composite powder was prepared by mixing carbonyl iron with Fe91S19,Fe91.2Si3.1P2.9Sb2.8 and Fe90Si10 powder in different proportion. The composite powder has excellent microwave absorption property. When the mass ratio of two powders is 1:1, the absorption property is the best. The main factor of producing this excellent absorption property is that the electromagnetic matching property is improved after mixing the two kinds of powders with proper proportion.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TF123.2

【引證文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前2條

1 李忠芳;滲碳體磁性粉體的制備與性能研究[D];山東大學(xué);2012年

2 谷樹超;Fe基吸收劑的機械合金化制備及電磁性能研究[D];大連理工大學(xué);2013年

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本文編號：2202605