永磁材料對電子技術(shù)企業(yè)的發(fā)展進(jìn)步至關(guān)重要。由于具有很高的理論磁能積（144MGOe）,納米雙相磁體成為研究熱點(diǎn)之一。但近期實(shí)驗(yàn)研究結(jié)果發(fā)現(xiàn)實(shí)際所得樣品材料的微結(jié)構(gòu)與理論要求相差甚遠(yuǎn),致使矯頑力和磁性能很低。通過添加微量元素來改善材料微結(jié)構(gòu)是提高矯頑力的有效方法。本文研究了在不同甩帶速度下鋯的摻雜對納米復(fù)合永磁材料Pr2Fe14B/α-Fe磁性能的影響。使用了感應(yīng)熔煉的方法在純氬氣氛圍中制備了化學(xué)組分為Pr9.5Feg4-xB6.5-yZrxPy（x=0,1,2,3;y=0,0.1）的合金塊體,然后通過甩帶的方法在不同甩帶速度（8,24和30m/s）下制備了不同厚度（40-66μm）的條帶。研究發(fā)現(xiàn),相比于沒有鋯摻雜的合金,1 at.%的鋯摻雜中將會(huì)極大地提高母合金Pr9.5Fe84B6.5的磁性。在摻雜1at.%的鋯之后,磁能積從9kJm3（缺鋯合金）大幅提高到了 80kJJm3（富鋯合金）,矯頑力也被大大地提升,從89kAm-1（缺鋯合金）到886kAm-1（富鋯合金）,同時(shí)剩磁從0.51T提高到0.75T。使用粉末X射線衍射技術(shù)分析了條帶的物相組成,在1 at.%的鋯摻雜之后,母合... 

【文章來源】：山東大學(xué)山東省 211工程院校 985工程院校 教育部直屬院校

【文章頁數(shù)】：83 頁

【學(xué)位級(jí)別】：碩士

【文章目錄】：
摘要
Abstract
Chapter 1. Introduction
    1.1 History of Magnetism
    1.2 Introduction to permanent magnets
    1.3 Origin of Ferromagnetism
    1.4 Magnetic Behavior
        1.4.1 Diamagnetism
        1.4.2 Paramagnetism
        1.4.3 Ferromagnetism
        1.4.4 Anti-ferromagnetism
        1.4.5 Ferrimagnetism
    1.5 Intrinsic Properties
        1.5.1 Saturation Magnetization
        1.5.2 Anisotropy
        1.5.3 Magnetocrystalline anisotropy
        1.5.4 Shape anisotropy
    1.6 Magnetic domain:
    1.7 Hysteresis loop
        1.7.1 Remanence
        1.7.2 Coercivity
        1.7.3 Maximum Energy Product
    1.8 Coercivity mechanism
        1.8.1 Nucleation
        1.8.2 Domain wall pinning
    1.9 Objective of the study
Chapter 2. Literature Review
    2.1 Neodymium Iron Boron Magnet
    2.2 Production of Nd-Fe-B
    2.3 Melt Spinning Technique
    2.4 Nd-Fe-B-Zr Alloy
    2.5 Phosphorous doped melt spun ribbon
Chapter 3. Materials and Methods
    3.1 Material selection
    3.2 Electric Arc Furnace
    3.3 Melt Spinning Machine
    3.4 Vibrating Sample Magnetometer （VSM）
    3.5 X-Ray Diffraction （XRD）
        3.5.1 Fundamental Principle of XRD
        3.5.2 Instrumentation and specification
    3.6 Scanning Electron Microscopy
    3.7 Elemental Analysis by Energy Dispersive Spectroscopy （EDS）
Chapter 4. Results and Discussion
9.5Fe_84-xB_6.5Zr_x as-spun ribbon alloy">    4.1 Magnetic properties of Pr_9.5Fe_84-xB_6.5Zr_x as-spun ribbon alloy
9.5Fe₈₄B_6.5">        4.1.1 Pr_9.5Fe₈₄B6.5

        4.1.2 Pr_9.5Fe₈₃B_6.5Zr₁

        4.1.3 Pr_9.5Fe₈₂B_6.5Zr₂

        4.1.4 Pr_9.5Fe₈₁B_6.5Zr₃

    4.2 Magnetic properties of Pr_9.5Fe_84-xB_6.4P_0.1Zr_x as-spun ribbon alloy
9.5Fe₈₄B_6.4P_0.1">        4.2.1 Pr_9.5Fe₈₄B_6.4P_0.1

        4.2.2 Pr_9.5Fe₈₃B_6.4P_0.1Zr₁

        4.2.3 Pr_9.5Fe₈₂B_6.4P_0.1Zr₂

        4.2.4 Pr_9.5Fe₈₁B_6.4P_0.1Zr₃

Conclusion
References
Acknowledgement
學(xué)位論文評閱及答辯情況表


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期刊論文
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