粉體物性及摻雜對鎳鋅銅鐵氧體機械性質之影響

本實驗研究採用商用粉末，首先利用改變球磨參數，經由不同球磨時間研磨後，針對粉徑、晶粒分佈等物理特性，其燒結後的機械性質之影響；其次，利用最佳之球磨參數，將氧化物A、B、C、D摻雜於鎳鋅銅鐵氧磁體，改變摻雜含量(0~5 wt%)，探討摻雜含量不同對鎳鋅銅鐵氧體機械性質與磁特性的影響。研究結果顯示，粉徑隨球磨時間增加而下降，其分佈範圍較為集中，對於燒結後晶粒分佈均勻，能有效提升材料之機械性質，球磨24小時可得最小之粒徑為0.54 μm，晶粒分佈呈現單峰狀態。另外，摻雜不同金屬氧化物，因各氧化物的離子半徑大小不同，有固溶及析出於基材之現象，導致於晶粒相成分、組織改變，進而影響機械性質、磁性能。適量的摻雜不同金屬氧化物，能有效提升機械性質，摻雜5.0 wt%氧化物B有最高抗折強度值143 MPa；過量的摻雜使晶粒異常成長、封閉孔產生，導致機械性質下降。磁性能方面，晶粒尺寸越大且晶粒邊界數量減少，使磁區壁容易移動，初始導磁率因此上升，在測試頻率為796 KHz，摻雜1.5wt % 氧化物D有最高初始導磁率為587。

關鍵字

鎳鋅銅鐵氧體；彎曲強度

並列摘要

Commercial available powder was used as host material in this study. After milling for various durations, the effects of the physical characteristics of the powders on the mechanical properties of the sintered ferrites were evaluated. The best milling parameters were then used throughout this study. Dopants including oxide A , B, C, D were added in Ni-Zn-Cu ferrites in the amount 0 ~ 5 wt% and their effects on the mechanical properties of Ni-Zn-Cu ferrites magnetic characteristics were investigated. The results show that the particle size of the powder decreased with increasing milling time, and the particle size distribution became narrower. It was found that milling time of 24 h effectively reduced the average particle size down to 0.54 μm. Owing to both the ionic radius of the dopants and their solubility in the ferrite are different, the microstructural evolution of the sintered ferrites emerged to be significantly different and thus heir mechanical properties and magnetic properties as well. Of the dopants added, ferrite with 5.0 wt % oxide A addition registered the highest bending strength of 143 MPa. Too much oxide A addition would lead to abnormal grain growth and result in lower mechanical properties. As magnetic properties concern, ferrite with 1.5wt % oxide D addition reported the highest initial permeability of 587.

並列關鍵字

Ni-Zn-Cu ferrites ； Bending strength

參考文獻

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粉體物性及摻雜對鎳鋅銅鐵氧體機械性質之影響

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