本文選題：Fe-基納米晶磁性材料 + 快速退火��； 參考：《電子科技大學(xué)》2017年碩士論文

【摘要】：自從Fe-基納米晶合金問世以來,因其優(yōu)良的軟磁性能,諸多學(xué)者開始對(duì)其研究報(bào)道,并取得了大量的成果。但是,在高頻領(lǐng)域因其作為合金而具有的過高的介電常數(shù)特性,導(dǎo)致阻抗嚴(yán)重不匹配,從而影響了其高頻性能。為了實(shí)現(xiàn)優(yōu)化該材料的高頻性能,本論文首先系統(tǒng)全面的探索了常規(guī)退火工藝對(duì)FIENMET合金的各種影響。這些探索包括退火工藝對(duì)FINEMET合金晶相成分組成的影響、不同晶相組分的特殊性質(zhì)、形狀因素對(duì)性能的影響等。對(duì)于Fe-基納米晶合金來說,由于此類納米晶合金材料的介電常數(shù)相比于磁導(dǎo)率來說其值太高,單獨(dú)磁導(dǎo)率的提高對(duì)于吸波性能的提高效果并不明顯。為了進(jìn)一步提高樣品的高頻性能,必須想辦法大幅降低樣品的高頻介電性能�？萍脊ぷ髡咭矊�(duì)降低Fe-基納米晶合金介電常數(shù)的措施做了很多探索,其中效果做最好的就是氧化包覆。這種思路簡單來說,就是在高磁導(dǎo)率、高介電常數(shù)的樣品外面包覆一層沒有電磁性能的氧化物等,從而降低樣品的介電常數(shù)。這種方法雖然在一定程度上可行,但是工藝流程太麻煩,需要在對(duì)樣品晶化退火處理之后,再進(jìn)行氧化包覆,不適合規(guī)模化生產(chǎn)。同時(shí),包覆的氧化物對(duì)材料的磁導(dǎo)率優(yōu)化以及電磁波的吸收沒有任何幫助。我們對(duì)Fe-基納米晶合金的優(yōu)化方法是使用快速退火工藝處理樣品。利用樣品的結(jié)構(gòu)特點(diǎn):細(xì)小的納米晶粒彌散的分布在具有高電阻率的非晶軟磁基體上。通過快速退火工藝處理樣品使樣品的高電導(dǎo)率軟磁晶相部分被高電阻率的非晶相、硬磁相等包圍起來,這種方法類似于包覆處理,而且包圍在軟磁相上的非晶相也是磁性材料也可以參與吸收電磁波。同時(shí),快速處理工藝由于急速達(dá)到設(shè)定溫度,減少了過渡態(tài)的存在,并使晶粒來不及長大,會(huì)使晶粒細(xì)化,從而達(dá)到減小介電常數(shù)的目的,大幅優(yōu)化Fe-基納米晶的高頻性能。
[Abstract]:Since the advent of Fe-based nanocrystalline alloys, due to their excellent soft magnetic properties, many scholars began to report on them, and made a lot of achievements. However, in the high frequency field, because of its high dielectric constant as alloy, the impedance is seriously mismatched, thus affecting its high frequency performance. In order to optimize the high frequency properties of the FIENMET alloy, the influence of conventional annealing process on the FIENMET alloy was studied in this paper. These researches include the effect of annealing process on the composition of crystal phase of FINEMET alloy, the special properties of different crystal phase components, and the influence of shape factors on the properties of FINEMET alloy. For Fe- based nanocrystalline alloys, because the permittivity of this kind of nanocrystalline alloy is too high compared with the permeability, the enhancement of the single permeability is not obvious. In order to further improve the high frequency properties of the samples, we must find a way to significantly reduce the high frequency dielectric properties of the samples. Scientists have also explored ways to reduce the permittivity of Fe- based nanocrystalline alloys, the best of which is oxidation coating. The simple idea is to coat the samples with high permeability and high dielectric constant with a layer of oxide without electromagnetic properties, so as to reduce the dielectric constant of the samples. Although this method is feasible to some extent, the process is too troublesome, and it is not suitable for large-scale production because it needs to be oxidized after annealing the samples. At the same time, the coated oxide is of no help to the optimization of permeability and the absorption of electromagnetic wave. We optimized the Fe-based nanocrystalline alloy by rapid annealing process. The fine nanocrystalline particles were dispersed on amorphous soft magnetic matrix with high resistivity. The high conductivity soft magnetic phase is surrounded by amorphous phase with high resistivity by rapid annealing process, and the hard magnetic field is equal. This method is similar to the coating treatment. The amorphous phase surrounded by the soft magnetic phase is also a magnetic material which can also participate in the absorption of electromagnetic waves. At the same time, the rapid treatment process can reduce the existence of transition state and make the grain grow too late, which can reduce the dielectric constant and optimize the high frequency properties of Fe-based nanocrystals.
【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】：2017
【分類號(hào)】：TG156;TG131

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