近年來，通訊裝置快速蓬勃發展，高頻通訊市場之需求因此提高，而傳統使用之NiCuZn鐵氧磁體，因受限於Snoek’s limit限制則多改採用六方晶型鐵氧磁體為主，但六方晶型之燒結溫度ㄧ般均在1200℃以上，需藉由添加助燒結劑鉍錋鋅矽玻璃後，才可使燒結溫度降低到900℃左右，但其初導磁係數(μ’)卻急速劣化，因此開發出具有較高初導磁係數、高截止頻率之複合鐵氧磁體材料變得相當重要。本研究先由添加兩種不同六方晶型鐵氧磁體(Co2Y/BaM)於鎳銅鋅鐵氧磁體中，經950℃持溫兩個小時燒結條件下，探討Co2Y與BaM混合鎳銅鋅鐵氧磁體後之磁性質與顯微結構之差異，實驗結果發現，經950℃持溫兩個小時燒結條件下，皆不會產生二次相，且隨著Co2Y添加量的增加(0~5wt%)，其截止頻率可以從10MHz延後到100MHz左右，且耐流量明顯提高；但隨著BaM添加量的增加，卻會產生固溶的現象，降低燒結品質，使緻密度嚴重劣化。因此本研究擬藉由添加鎳銅鋅鐵氧磁體於六方晶系Co2Y鐵氧磁體中，並探討不同鎳銅鋅鐵氧磁體添加量對Co2Y鐵氧磁體之磁性質與顯微結構之影響。研究結果顯示添加鎳銅鋅鐵氧磁體粉末於Co2Y鐵氧磁體中之樣品經950℃燒結後均不會產生二次相，且微量添加鎳銅鋅鐵氧磁體不僅可以促進燒結，使燒結溫度降低到850℃，並可有效提升初導磁係數。而初導磁係數隨著鎳銅鋅鐵氧磁體添加量的增加而上升，當鎳銅鋅鐵氧磁體添加量達到20wt%時，可使經950℃燒結後之樣品其初導磁係數維持在5左右(1M~1GHz)。

Magneto-plumbite ferrites with hexagonal structures have revealed a higher dispersion frequency than NiCuZn ferrites, which can be used in high frequency applications. Among those ferrites, the Co2Y ferrite 2(BaO)．2(CoO)．6(Fe2O3) has good magnetic properties (such as permeability and quality factors) above 200MHz. However, the densification temperature of Co2Y ferrites always exceeds 1000oC and the initial permeability of low temperature fired Co2Y ferrites with glass addition is too low (μi = 2-4), which limit its application in multilayer chip inductors. Improved the densification at low temperatures can be achieved by adding glass flux. However, the glass addition often results in magnetic properties degradation due to the low-permeability additive dilution effect or the chemical reaction between the glass and ferrites to form a low-permeability phase. In this study, the magnetic properties of low temperature sintering Co2Y ferrite can be improved by adding nickel- copper- zinc (NiCuZn) ferrites, and investigated the effect of the addition of NiCuZn ferrites on the magnetic properties and microstructure of Co2Y.
The results show that no second phase was observed for the Co2Y- NiCuZn ferrite composite sintering at 900°C and the densification temperature can not only be reduced to 850oC, but also can effectively enhance the initial permeability by adding trace addition of nickel-copper-zinc ferrites. The initial permeability increased with increasing the addition of the NiCuZn ferrite. When the NiCuZn ferrites addition was up to 20wt%, the initial permeability of 4-5 (1MHz- 1 GHz) could be obtained for the Co2Y- NiCuZn ferrite composite sintering at 900°C.

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