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低稀土含量的納米復(fù)相α-Fe/Nd2Fe14B淬態(tài)合金微結(jié)構(gòu)與微波電磁特性研究
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國(guó)家自然科學(xué)基金（10804079）


Microstructure and Microwave Electromagnetic Properties of Rapidly Quenched α-Fe/Nd2Fe14B Nanocomposites with Low RE Content
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    摘要:

    對(duì)低稀土含量的Nd6Fe91B3合金進(jìn)行熔體快淬處理，制備了由α-Fe相和少量的Nd2Fe14B相組成的納米復(fù)相材料,并對(duì)其進(jìn)行球磨處理25 h。研究了快淬速度對(duì)淬態(tài)合金的相組成、微觀結(jié)構(gòu)、微波電磁性能的影響規(guī)律。研究結(jié)果表明，隨著淬度的提高，淬態(tài)合金中高磁晶各向異性的Nd2Fe14B相逐漸減少，材料的自然共振頻率向低頻移動(dòng)，但樣品微波磁導(dǎo)率隨淬速的提高而升高。淬速為40 m/s的樣品微波磁導(dǎo)率虛部在4.17 GHz獲得最大值=4.66，其實(shí)部在1.55 GHz獲得最大值=7.88。同時(shí)，低稀土含量的納米復(fù)相α-Fe/Nd2Fe14B材料具有良好的微波電特性，其復(fù)介電常數(shù)在2 GHz附近出現(xiàn)共振。由于磁損耗和電損耗共同作用，有利于該材料在GHz頻段電磁波吸收材料中的應(yīng)用。

    Abstract:

    The nanocomposites consisting of α-Fe and a small quantity of Nd2Fe14B have been prepared using rapid quenching from Nd6Fe91B3 melt with low rare earth content and ball milling for 25 h. The effect of rapid quenching speed on the phase composition, microstructure, and microwave electromagnetic properties of α-Fe/Nd2Fe14B nanocomposites have been investigated. Results show that the microwave complex permeability increases and the resonance frequencies (fr) of as-spun Nd6Fe91B3 alloys shifts to lower values with the increase of quenching speed, due to the decrease of Nd2Fe14B with the large anisotropy field (HA). The real part of complex permeability of Nd6Fe91B3 alloy reaches the maximum μmax′=7.88 at 1.55 GHz and imaginary part of permeability reach the maximum at 4.17 GHz μmax″=4.66. Furthermore, the α-Fe/Nd2Fe14B nanocomposites with low Re content shows an excellent microwave permittivity, and its resonance appears at about 2 GHz. Therefore, the α-Fe/Nd2Fe14B nanocomposites are beneficial to be applied to electromagnetic wave absorber in GHz, due to the cooperation effect of magnetic loss and dielectric loss.

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連利仙,劉 穎,鄧龍江.低稀土含量的納米復(fù)相α-Fe/Nd2Fe14B淬態(tài)合金微結(jié)構(gòu)與微波電磁特性研究[J].稀有金屬材料與工程,2013,42(2):292~296.[Lian Lixian, Liu Ying, Deng Longjiang. Microstructure and Microwave Electromagnetic Properties of Rapidly Quenched α-Fe/Nd2Fe14B Nanocomposites with Low RE Content[J]. Rare Metal Materials and Engineering,2013,42(2):292~296.]
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  • 收稿日期:2012-02-21
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