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研究生: 楊斯羽
Yang, Sih-Yu
論文名稱: 以低溫燒結技術應用於軟磁材料之研究
A Study on Soft Magnetic Materials by Using Cold Sintering Technology
指導教授: 李文熙
Lee, Wen-Hsi
學位類別: 碩士
Master
系所名稱: 電機資訊學院 - 電機工程學系
Department of Electrical Engineering
論文出版年: 2018
畢業學年度: 106
語文別: 英文
論文頁數: 75
中文關鍵詞: 冷燒結技術軟磁材料添加劑退火
外文關鍵詞: cold sintering process, soft magnetic materials, additive, annealing
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  • 燒結是一種熱處理工藝,在過去幾十年中有關燒結的研究一直非常活躍,而且仍然在不斷普及。儘管開發了許多種先進的技術,大多數材料的燒結製程溫度還是在高達1000℃以上的高溫下進行。最近,Pennsylvania State University研究團隊建立了一個新的燒結途徑-冷燒結工藝(Cold Sintering Process, CSP),在低於300℃的低溫環境下成功地獲得一緻密的陶瓷固體。
    在本次研究中,我們以相似觀念運用在軟磁材料-鎳鋅鐵氧體,其具有高頻、高阻抗和低損耗的特點,再找出適合的添加劑使其黏著,並且使用熱壓機調整製程的溫度、壓力和持溫時間,製作出一環形樣品測量磁特性,但結果顯示低於原始粉末,最後使用後處理的方式-退火,改善磁特性,使其能與傳統製程相互媲美。

    Sintering is a heat treatment process. Not only has its research been very active in the past decades but it is still being popularized. Although many advanced technologies have been developed, most of their temperature for several materials in sintering process still remain quite high, at least 1000℃. Recently, the research team at The Pennsylvania State University established a new sintering route, called Cold Sintering Process (CSP), which is capable to densify materials at the low temperature under 300℃ to obtain dense ceramic solids.
    In our research, we apply the similar concepts on the soft magnetic material, nickel zinc ferrite, which has high frequency, high impedance, and low loss. We find a suitable additive for adherence and use a hot-pressing machine with various parameters, such as temperature, pressure, and soaking duration, in order to fabricate a toroidal core. After magnetic properties measurement, the results show that they are lower than that of the original powders. Finally, with post-processing, annealing, the magnetic properties can be improved, which is able to compete with the traditional process.

    摘要 I Abstract II 誌謝 III Content IV Table Captions VI Figure Captions VII Chapter 1 Introduction 1 1-1 Foreword 1 1-2 Motivation 6 Chapter 2 Literature Review 8 2-1 Hysteresis curve 8 2-2 Soft magnetic materials 11 2-2-1 Ni-Zn ferrite 11 2-3 Cold sintering process 13 2-4 Liquid phase sintering 15 2-5 Hydrothermal method 17 2-6 Hot pressing sintering 19 Chapter 3 Experiment and Research Methods 20 3-1 Experimental framework 20 3-1-1 Low temperature sintering process 21 3-2 Experimental procedures 22 3-2-1 Preparation and pre-processing of Ni-Zn ferrite powders 22 3-2-2 Additive selection 23 3-2-3 Fabrication process of the sample 25 3-2-4 Measurement of sample 25 3-3 Experimental devices and measuring equipment 29 3-3-1 3D Optical microscopy 29 3-3-2 Scanning electron microscope 30 3-3-3 Energy dispersive spectrometer 31 3-3-4 B-H analyzer 32 Chapter 4 Results and Discussion 35 4-1 Results of additive 35 4-1-1 The amount of additive 39 4-2 Results of bulk samples 39 4-2-1 Bulk samples made at 50℃ 40 4-2-2 Bulk samples made at 150℃ 43 4-2-3 Bulk samples made at 250℃ 46 4-3 Optimization of parameters 49 4-4 Results of toroidal core 52 4-4-1 Toroidal core measurement 52 4-4-2 Annealing 54 4-4-3 Comparison 65 Chapter 5 Conclusions 71 Reference 72

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