發(fā)布時間：2018-04-18 00:15

  本文選題：NiZn功率鐵氧體 + 磁導(dǎo)率��； 參考：《電子科技大學(xué)》2014年碩士論文

【摘要】：本論文以高性能耐熱沖擊和高機械強度NiZn功率鐵氧體材料為研究目標,優(yōu)先保證優(yōu)異的電磁性能,如高磁導(dǎo)率、高飽和磁感應(yīng)強度、高密度、高電阻率、低損耗等符合功率鐵氧體要求的材料技術(shù)指標。選擇滿足技術(shù)指標的樣品,進行耐熱沖擊和機械強度的實驗,根據(jù)實驗結(jié)果,從摻雜和工藝兩方面出發(fā),研究分析影響鐵氧體磁芯耐熱沖擊和機械強度的因素和機理,提出提高鎳鋅軟磁鐵氧體磁芯耐熱沖擊和機械強度的方法。具體內(nèi)容包括:1、分別研究Co2+、Cu2+取代和Zn2+對鎳鋅功率鐵氧體物相、磁性參數(shù)和微觀結(jié)構(gòu)的影響。根據(jù)實驗結(jié)果,選取合適的工藝條件、離子取代以及取代量,來達到我們所需要的材料指標。實驗結(jié)果表明,在相同取代量變化范圍,Co和Cu呈現(xiàn)出顯著不同的變化趨勢。由于過渡液相燒結(jié)促進致密化和顯微結(jié)構(gòu)的完善而增加燒結(jié),Cu取代樣品具有更高的飽和磁感應(yīng)強度、起始磁導(dǎo)率和更低的相對損耗因子。2、研究二磨摻雜WO3,CaCO3-SiO2的復(fù)合摻雜,WO3-SiO2的復(fù)合摻雜,一磨摻雜Bi2O3,分別對鎳鋅功率鐵氧體磁性參數(shù)和微觀結(jié)構(gòu)的影響,根據(jù)實驗結(jié)果,選取合適的工藝條件、摻雜離子以及摻雜量,來達到我們的要求。添加適當比例的WO3可以提高燒結(jié)密度,減少氣孔的產(chǎn)生,晶粒均勻性會更好,這都會有利于樣品的耐熱沖擊性能。加入CaCO3-SiO2組合增加晶界的厚度,以此來增強試樣的機械強度和耐熱沖擊性能。微量的Bi2O3摻雜,在降低燒結(jié)溫度的同時,有望改善功率鐵氧體材料的顯微結(jié)構(gòu)。3、首先對熱沖擊斷裂和損傷理論、鐵氧體材料強度這兩方面的理論進行了敘述,并分別分析了影響兩者的一些關(guān)鍵因素。利用第三章?lián)诫s得到的一些樣品進行實驗,探討了影響鐵氧體磁芯耐熱沖擊和機械強度的因素和機理,建立微結(jié)構(gòu)控制模型,揭示工藝條件和不同的摻雜體系對氣孔和晶粒分布的影響規(guī)律,進而影響試樣耐熱沖擊性能和機械強度。晶粒細小,分布均勻,氣孔率低都是提高材料耐熱沖擊性能和機械強度的首選途徑。
[Abstract]:In this paper, high performance heat shock and high mechanical strength NiZn power ferrite materials are the research targets, and the excellent electromagnetic properties, such as high permeability, high saturation magnetic induction intensity, high density, high resistivity, are preferred.Low loss and other material technical specifications that meet the requirements of power ferrite.The thermal shock and mechanical strength of ferrite core were studied and analyzed from the aspects of doping and processing according to the experimental results of thermal shock and mechanical strength of the ferrite core, which met the technical specifications, and the factors affecting the thermal shock and mechanical strength of the ferrite core were studied and analyzed.A method to improve the thermal shock and mechanical strength of nickel zinc soft magnetic ferrite core is proposed.The effects of Co2 Cu2 substitution and Zn2 on the phase, magnetic parameters and microstructure of Ni-Zn power ferrite were studied.According to the experimental results, the suitable technological conditions, ion substitution and substitution amount were selected to meet the material requirements.The experimental results show that the variation trends of Co and Cu in the same range of substitution amount are significantly different.Because the transition liquid phase sintering promotes the densification and the microstructure improvement, the higher saturation magnetic induction intensity is obtained by increasing the sintered Cu substitution sample.The initial permeability and lower relative loss factor. 2. The effects of mixed doping of WO _ 3C _ 3-SiO _ 2 and Bi _ 2O _ 3 on the magnetic parameters and microstructure of Ni-Zn power ferrite were studied.The appropriate process conditions, doping ions and doping amount were selected to meet our requirements.Adding a proper proportion of WO3 can increase the sintering density, reduce the production of pores, and improve the grain uniformity, which will be beneficial to the thermal impact properties of the samples.The mechanical strength and thermal impact properties of the samples were enhanced by adding CaCO3-SiO2 combination to increase the thickness of grain boundary.The microamount of Bi2O3 doping is expected to improve the microstructure of power ferrite materials at the same time as decreasing sintering temperature. Firstly, the theory of thermal shock fracture and damage and the strength of ferrite materials are described.Some key factors affecting the two factors are analyzed respectively.Based on the experimental results of some samples doped in the third chapter, the factors and mechanisms affecting the thermal shock and mechanical strength of ferrite cores are discussed, and the microstructure control model is established.The effects of process conditions and different doping systems on porosity and grain distribution were revealed, and the thermal impact properties and mechanical strength of the samples were further affected.Fine grains, uniform distribution and low porosity are the preferred ways to improve the thermal impact properties and mechanical strength of the materials.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM277

【相似文獻】

相關(guān)會議論文 前1條

1 黃偉;;對PCB耐熱沖擊性的改善討論[A];第七屆全國印制電路學(xué)術(shù)年會論文集[C];2004年

相關(guān)碩士學(xué)位論文 前1條

1 陳康;耐熱沖擊NiZn功率鐵氧體材料的研究[D];電子科技大學(xué);2014年

，

本文編號：1765937