离心雾化法制备FeSi合金粉及其电磁性能研究
发布时间：2018-08-25 10:28
【摘要】：离心雾化法是商业生产中普遍使用的一种大批量合金微粉生产方法,具备生产效率高、微粉颗粒均匀、生产成本低的优点,但一般的雾化法制备的微粉颗粒为球形。而作为电磁波吸收剂所使用的合金粉末来说,较大的长径比能增加材料的吸收性能。根据这一需求本论文设计制作了一套离心雾化设备,并用该设备制备了椭球形和球形的Fe90Si10、Fe80Si20和Fe70Si30合金粉。利用X射线衍射仪(X-ray diffraction, XRD)扫描电子显微镜(Scanning electronic microscope, SEM)和矢量网络分析仪(Vector network analysis)等检测仪器对其相结构、微观形貌及电磁特性进行了表征,并研究了其电磁波吸收性能。研究结果表明： 椭球形和球形的Fe90Si10、Fe80Si20和Fe70Si30合金粉分别主要由体心立方的α-Fe、Fe1.34Si0.66化合物和FeSi化合物相所组成。其复介电常数实部随着硅含量的增加先增大后减小,虚部保持在0.2左右。复磁导率Fe90Si10合金粉的明显高于其余两者。增加粉体填充率,能有效地增大复介电常数实部和磁导率虚部。在所测试的厚度分别为2mm、3mm和4mm试样中,成分为Fe90Si10的合金粉吸收频带更宽,在整个测试频段内的吸波性能明显优于其他两种成分的合金粉。且较大的填充率,能获得较好的吸收性能。 本论文所制备的Fe90Si10合金粉与市售球形Fe91Si9合金粉相比,无论是电磁性能还是微波吸收性能都要明显优于市售球形Fe91Si9合金粉。羰基铁分别与市售Fe91S19、Fe91.2Si3.1P2.9Sb2.8和自制Fe90Si10的粉末按不同比例混合制备成复合粉末,所制备的复合粉末具有优良的微波吸收性能。当两种粉末质量比为1：1时,吸收性能最佳。产生这种优良的吸收性能主要因素是：适当比例的两种粉末混合后,电磁匹配性能提高。
[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 伪 -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.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TF123.2
本文编号：2202605
[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 伪 -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.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TF123.2
【引证文献】
相关硕士学位论文 前2条
1 李忠芳;渗碳体磁性粉体的制备与性能研究[D];山东大学;2012年
2 谷树超;Fe基吸收剂的机械合金化制备及电磁性能研究[D];大连理工大学;2013年
，本文编号：2202605
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