本文選題：納米晶合金 + 軟磁性能�。� 參考：《太原理工大學(xué)》2017年碩士論文

【摘要】：鐵基納米晶合金是由非晶合金經(jīng)過熱處理得到的一種具有納米晶結(jié)構(gòu)的軟磁材料。正是由于這種獨特的納米晶結(jié)構(gòu),鐵基納米晶合金具有優(yōu)異的軟磁性能:低的矯頑力(Hc)、高的飽和磁感應(yīng)強度(Bs)和磁導(dǎo)率(μe)以及接近于零的磁致伸縮系數(shù)等,可以有效地降低鐵芯損耗和噪聲。因此,鐵基納米晶合金被廣泛地應(yīng)用于開關(guān)電源、高精密電流/電壓互感器、共模扼流線圈、高頻變壓器等電力電子領(lǐng)域。Finemet合金是目前得到廣泛應(yīng)用的納米晶軟磁材料之一,但是此合金具有貴金屬Nb元素含量高、Bs低等缺點。為了降低生產(chǎn)成本、提高Bs,本文通過降低Nb含量提高Fe含量,成功開發(fā)出了兼具高Bs和優(yōu)異軟磁性能的FeSiBNbCu納米晶合金;用抗氧化性好的Mo元素替代Nb元素,解決了高Fe含量的FeSiBNbCu表面晶化的問題;以高Fe含量的FeSiBNbCu為對象,研究了表面晶化程度對軟磁性能的影響。主要的研究內(nèi)容和研究結(jié)果如下所示:(1)成功開發(fā)出了兼具優(yōu)異軟磁性能和高熱穩(wěn)定性的高頻高Bs的Fe78-xSi13B8NbxCu1(x=0,1,2和3)納米晶合金,系統(tǒng)地研究了 Nb元素的含量對FeSiBNbCu合金體系軟磁性能、熱穩(wěn)定性及微觀結(jié)構(gòu)的影響。研究發(fā)現(xiàn),通過添加適量的Nb元素,Fe76Si13B8Nb2Cu1納米晶合金平均晶粒尺寸可達10nm左右,同時具有優(yōu)異的軟磁性能,即高Bs(1.39T)、低Hc(1.5A/m)和高μe(21500,在1 kHz下)。此合金具有寬達100℃的熱處理溫度區(qū)間和長達60 min的熱處理時間區(qū)間,說明此合金具有優(yōu)異的熱穩(wěn)定性和軟磁性能。(2)成功開發(fā)出了Bs高達 1.74 T 的 Fe82Cu1Si4B11.5Nb1.5-xMox(x=0,0.75和1.5 at.%)納米晶合金體系,并研究了 Mo元素對此體系非晶形成能力、軟磁性能及微觀結(jié)構(gòu)的影響。研究發(fā)現(xiàn)Mo元素的添加可以提高合金的非晶形成能力,但添加微量的Mo效果不明顯。經(jīng)過熱處理以后,所有的合金具有優(yōu)異的軟磁性能,即高的Bs(1.67～1.74T),低的Hc(8.9～10.8A/m),和高的μe(11500～11900在1 kHz下)。此外,含Mo合金具有更優(yōu)異的高頻特性,使得此合金有望應(yīng)用于高頻電力電子設(shè)備。(3)利用Fe82Cu1Si4B11.5Nb1.5納米晶合金隨著銅輥轉(zhuǎn)速變化而具有不同結(jié)構(gòu)的現(xiàn)象,研究了表面晶化程度對軟磁性能、熱穩(wěn)定性和微觀結(jié)構(gòu)演化的影響。研究發(fā)現(xiàn)表面晶化樣品的熱處理溫度區(qū)間比完全非晶態(tài)的樣品更寬,適量的表面晶化可以降低鐵芯損耗,但是過度晶化會導(dǎo)致鐵芯損耗的增高。最后,從擴散和競爭過程兩方面討論了表面晶化的納米晶合金帶材的晶化過程,認為晶化過程是受擴散和競爭過程共同驅(qū)動的。
[Abstract]:Fe-based nanocrystalline alloy is a soft magnetic material with nanocrystalline structure obtained by heat treatment of amorphous alloy. It is precisely because of this unique nanocrystalline structure that Fe-based nanocrystalline alloys have excellent soft magnetic properties: low coercivity (HC), high saturation magnetic induction (Bs) and permeability (渭 e), and near zero magnetostrictive coefficient, etc. It can effectively reduce core loss and noise. Therefore, Fe-based nanocrystalline alloys are widely used in switching power supply, high-precision current / voltage transformer, common-mode choke coil, high-frequency transformer and other power electronics fields. Finemet alloy is one of the widely used nanocrystalline soft magnetic materials. However, the alloy has the disadvantages of high NB content and low Bs content. In order to reduce production cost and increase Bscontent, FeSiBNbCu nanocrystalline alloy with high Bs and excellent soft magnetic properties was successfully developed by reducing NB content and increasing Fe content, and NB element was replaced by Mo element with good oxidation resistance. The problem of surface crystallization of FeSiBNbCu with high Fe content was solved, and the effect of the degree of surface crystallization on the soft magnetic properties of FeSiBNbCu with high Fe content was studied. The main research contents and results are as follows: (1) Fe78-xSi13B8NbxCu1 (xOOONbCu 2 and 3) nanocrystalline alloys with excellent soft magnetic properties and high thermal stability have been successfully developed, and the soft magnetic properties of FeSiBNbCu alloy system have been systematically studied. Effects of thermal stability and microstructure. It is found that the average grain size of Fe 76Si13B 8Nb 2Cu 1 nanocrystalline alloy is about 10nm by adding proper amount of NB element, and it has excellent soft magnetic properties, I. e., high Bs (1.39T), low Hc (1.5A/m) and high 渭 e (21500, at 1 kHz). The alloy has a wide heat treatment temperature range of 100 鈩，

本文編號：2084154