【摘要】：隨著科技的進(jìn)步,無(wú)論是電力電子器件、信息技術(shù)產(chǎn)業(yè)還是軍事國(guó)防工業(yè),都對(duì)軟磁材料提出了更高的要求。本課題組制備出的具有微胞結(jié)構(gòu)的軟磁復(fù)合材料,以軟磁鐵氧體作為的絕緣包覆層,利用等離子放電燒結(jié)技術(shù)實(shí)現(xiàn)的高、低熔點(diǎn)不同相的致密燒結(jié),在提高軟磁材料電阻率的同時(shí),兼顧到磁導(dǎo)率和飽和磁感應(yīng)強(qiáng)度,是解決軟磁材料高磁能密度與高電阻率矛盾的可行辦法。本文對(duì)微胞軟磁復(fù)合材料的制備工藝進(jìn)行改良,制備出了微胞尺寸一致,包覆層均勻的微胞軟磁復(fù)合材料,樣品電阻率有了明顯的提高。針對(duì)微胞軟磁復(fù)合材料的特殊結(jié)構(gòu),構(gòu)建微胞軟磁復(fù)合材料的模擬模型。以有限個(gè)微胞實(shí)現(xiàn)對(duì)無(wú)窮多個(gè)微胞堆垛時(shí)單個(gè)微胞電磁場(chǎng)分布情況的近似求解,使得對(duì)具有復(fù)雜形狀周期性堆垛的軟磁復(fù)合材料進(jìn)行模擬計(jì)算成為可能。在模擬計(jì)算過程中,改了變金屬粉體粒徑、金屬粉體與包覆層磁導(dǎo)率、包覆層電阻率和樣品宏觀電阻率,計(jì)算出不同條件下樣品的等效磁導(dǎo)率、胞間渦流損耗、胞內(nèi)渦流損耗,定量分析出了以上各個(gè)因素的變化對(duì)制備出的微胞軟磁復(fù)合材料性能的影響。模擬計(jì)算的結(jié)果表明：采用高磁導(dǎo)率的絕緣包覆材料是提高具有微胞結(jié)構(gòu)的軟磁復(fù)合材料等效磁導(dǎo)率的最主要手段。在軟磁性絕緣包覆的前提下,提高金屬粉體的磁導(dǎo)率,降低包覆層的體積分?jǐn)?shù)可以進(jìn)一步提高樣品的等效磁導(dǎo)率。微胞軟磁復(fù)合材料的可以分為胞間渦流損耗和胞內(nèi)渦流損耗兩個(gè)部分,胞間渦流損耗與頻率的平方成正比,與宏觀電阻率成反比；胞內(nèi)渦流損耗與粒徑的平方、頻率的平方成正比,與顆粒的電阻率成反比。當(dāng)樣品宏觀電阻率達(dá)到一定水平后,其渦流損耗逐漸以胞內(nèi)損耗為主,需要采用更高電阻率、更小粒徑的金屬粉體以進(jìn)一步降低總渦流損耗。本文建立了微胞軟磁復(fù)合材料軟磁特性的有限元模擬模型,定量說(shuō)明了微胞軟磁復(fù)合材料采用軟磁性絕緣包覆對(duì)于提高樣品磁導(dǎo)率的重要性,為今后原材料的選擇和樣品的性能改進(jìn)指明了方向。通過數(shù)值計(jì)算獲得材料的軟磁性能,從而減少和簡(jiǎn)化微胞軟磁復(fù)合材料研究過程中的實(shí)驗(yàn)工作,降低研發(fā)成本,縮短研發(fā)周期,為進(jìn)一步深入的研究做好了鋪墊,并開辟了全新的視角。
[Abstract]:With the development of science and technology, both power electronic devices, information technology industry and military defense industry have put forward higher requirements for soft magnetic materials. The soft magnetic composites with microcellular structure were prepared by our research group. The soft magnetic ferrite was used as the insulating coating. The dense sintering of different phases with high and low melting points was realized by using plasma discharge sintering technology. It is a feasible method to solve the contradiction between high magnetic energy density and high resistivity of soft magnetic material by increasing the resistivity of soft magnetic material and taking into account the permeability and saturation magnetic induction intensity at the same time. In this paper, the preparation process of microcellular soft magnetic composites was improved, and the microcellular soft magnetic composites with uniform microcell size and uniform coating layer were prepared, and the resistivity of the samples was improved obviously. According to the special structure of microcellular soft magnetic composites, the simulation model of microcellular soft magnetic composites was constructed. A finite number of microcells are used to approximate the electromagnetic field distribution of a single microcell when infinite cells are stacked, which makes it possible to simulate and calculate the soft magnetic composites with complex shape periodic stacking. In the process of simulation and calculation, the particle size, permeability, resistivity of coating layer and macroscopic resistivity of samples were changed to calculate the equivalent permeability, intercellular eddy current loss and intracellular eddy current loss of samples under different conditions. The effects of the above factors on the properties of the microcellular soft magnetic composites were quantitatively analyzed. The simulation results show that the insulation coating material with high permeability is the most important means to increase the effective permeability of the soft magnetic composite with microcellular structure. Under the premise of soft magnetic insulation coating, the effective permeability of the sample can be further improved by increasing the permeability of the metal powder and reducing the volume fraction of the coating layer. The microcellular soft magnetic composites can be divided into two parts: intercellular eddy current loss and intracellular eddy current loss. The intercellular eddy current loss is proportional to the square of the frequency and inversely proportional to the macroscopic resistivity. The eddy current loss is proportional to the square of particle size, the square of frequency and the resistivity of particle. When the macroscopic resistivity of the sample reaches a certain level, the eddy current loss of the sample is gradually dominated by the intracellular loss, and the metal powder with higher resistivity and smaller particle size is needed to further reduce the total eddy current loss. In this paper, the finite element simulation model of soft magnetic properties of microcellular soft magnetic composites is established, and the importance of using soft magnetic insulation coating to improve the permeability of microcellular soft magnetic composites is quantitatively explained. It points out the direction for the selection of raw materials and the improvement of the performance of the samples in the future. Through numerical calculation, the soft magnetic properties of the materials are obtained, thus reducing and simplifying the experimental work in the research process of microcellular soft magnetic composites, reducing the research and development costs, shortening the research and development cycle, paving the way for further in-depth research. And opened up a new perspective.
【學(xué)位授予單位】：長(zhǎng)春工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TB33

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本文編號(hào)：2307241