本文選題：Fe基軟磁合金 + 電磁波吸收劑　； 參考：《電子科技大學(xué)》2015年碩士論文

【摘要】：Fe基軟磁合金是目前研究非常熱的信息功能材料之一,其優(yōu)異的電磁性能受到了很廣泛的關(guān)注。本文主要選用了Fe-Si-Al、Fe-Cu-Nb-Si-B兩種Fe基軟磁合金為研究對(duì)象,分別討論了在不同的球磨時(shí)間和熱處理工藝下它們所具有的電磁性能。重點(diǎn)引入穆斯堡爾譜的研究方法,利用穆斯堡爾譜極高的能量分辨率,研究球磨工藝和熱處理工藝導(dǎo)致的固態(tài)相變,通過研究相變前后內(nèi)部Fe原子核所處的周圍原子環(huán)境的變化,揭示固態(tài)相變過程中細(xì)微的原子環(huán)境變化導(dǎo)致的靜態(tài)磁性能的變化,從而解釋改良后電磁性能的物理本質(zhì)。本論文開展了以下的工作并得出了相關(guān)的結(jié)論:首先,通過對(duì)Fe-Si-Al球磨時(shí)間的控制,得出Fe-Si-Al顆粒的形狀對(duì)磁性能有較大的影響。本文著重研究了未球磨的無規(guī)則顆粒和球磨30小時(shí)后的片狀顆粒,對(duì)其進(jìn)行了形貌、高頻、靜態(tài)磁特性的對(duì)比分析。結(jié)果表明隨著球磨時(shí)間的增大,片狀合金厚度減小,比飽和磁化強(qiáng)度減小,復(fù)數(shù)磁導(dǎo)率和復(fù)介電常數(shù)得到提高。XRD測(cè)試表明,隨著球磨的進(jìn)行,Fe-Si-Al的晶體結(jié)構(gòu)逐漸從有序固溶體(D03型超晶格結(jié)構(gòu))轉(zhuǎn)變?yōu)闊o序固溶體ɑ-Fe(Si,Al)結(jié)構(gòu)。對(duì)球磨前后的樣品進(jìn)行了穆斯堡爾譜的測(cè)試,穆譜的擬合結(jié)果清楚地證實(shí)了有序固溶體向無序固溶體的轉(zhuǎn)變。其次,通過對(duì)Fe-Cu-Nb-Si-B(FINEMET)合金的熱處理,發(fā)現(xiàn)在熱處理后出現(xiàn)了部分納米晶相,實(shí)現(xiàn)了在片狀粉體顆粒中高電阻率的非晶鐵磁性相與低電阻率的納米晶鐵磁性相的共存。這種納米復(fù)合結(jié)構(gòu)能降低高頻下的渦流損耗。最后,對(duì)于具有這種雙鐵磁性相的納米復(fù)合結(jié)構(gòu),我們采用穆斯堡爾譜超精細(xì)相互作用參數(shù)的離散型的模型和分布式模型進(jìn)行擬合,可從擬合結(jié)果中知曉非晶基體的晶化程度。對(duì)熱處理后的片狀化FINEMET合金粉體進(jìn)行了電磁特性的測(cè)試,結(jié)果表明在1.93-3.2GHz范圍內(nèi)FINEMET合金粉體具有優(yōu)良的電磁波吸收性能。
[Abstract]:Fe-based soft magnetic alloy is one of the hot information functional materials, and its excellent electromagnetic properties have been paid more and more attention. In this paper, two Fe-base soft magnetic alloys, Fe-Si-Al-Fe-Cu-Nb-Si-B, are chosen as the research objects. The electromagnetic properties of Fe-Si-Al Fe-Cu-Nb-Si-B alloys under different ball-milling time and heat treatment are discussed respectively. Mossbauer spectroscopy was introduced to study the solid phase transition caused by ball milling and heat treatment by using the extremely high energy resolution of Mossbauer spectrum. By studying the changes of the atomic environment around the Fe nucleus before and after the phase transition, the changes of the static magnetic properties caused by the minor changes in the atomic environment during the solid phase transition are revealed, thus explaining the physical nature of the improved electromagnetic properties. In this paper, the following work has been done and relevant conclusions have been drawn: firstly, by controlling the milling time of Fe-Si-Al, it is concluded that the shape of Fe-Si-Al particles has great influence on the magnetic properties. In this paper, the irregular particles in the ball mill and the flake particles after 30 hours of ball milling are studied. The morphology, high frequency and static magnetic properties of the particles are compared and analyzed. The results show that with the increase of ball milling time, the thickness of the sheet alloy decreases, the specific saturation magnetization decreases, and the complex permeability and complex permittivity increase. With the ball-milling, the crystal structure of Fe-Si-Al is gradually changed from the ordered solid solution (D03) superlattice to the disordered solid solution (FE-Si-Al). The Mossbauer spectra of samples before and after ball milling were measured and the fitting results of Mu spectra clearly confirmed the transition from ordered solid solution to disordered solid solution. Secondly, by heat treatment of Fe-Cu-Nb-Si-B-FINEMET alloy, it is found that part of nanocrystalline phase appears after heat treatment, and the coexistence of high resistivity amorphous ferromagnetic phase and low resistivity nanocrystalline ferromagnetic phase is realized. This nanocomposite structure can reduce eddy current loss at high frequency. Finally, for the nanocomposite structure with this kind of double ferromagnetic phase, the discrete model and the distributed model of the hyperfine interaction parameters of Mossbauer spectrum are used to fit the structure. The degree of crystallization of the amorphous matrix can be known from the fitting results. The electromagnetic properties of FINEMET alloy powder after heat treatment were tested. The results show that FINEMET alloy powder has excellent electromagnetic wave absorption property in the range of 1.93-3.2GHz.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TG132.271

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本文編號(hào)：2027029