由於可攜式無線通訊產品不斷往小型化及薄型化發展，而單靠元件之複合化，仍無法完全滿足行動通訊產品對組裝空間之要求，需靠模組化之技術才可進一步節省30-40%之空間，使得直流電源轉換器模組將成為未來可攜式無線通訊產品元件市場之主流，因而使得大面積功率鎳銅鋅鐵氧磁體基板之研究亦成為重要課題。本研究並將第四章結論之“添加2wt% Bi2O3之鎳銅鋅鐵氧磁體之直流疊加特性”採用ZrO2生胚同時作為非磁性介質材料及燒結束縛層，以積層技術整合鎳銅鋅鐵氧磁體及非磁性ZrO2材料，除可解決大面積鎳銅鋅鐵氧磁體基板燒結翹曲、變形及分層之問題外，並可藉由產生之洩漏磁通，破壞磁蕊中之封閉磁性迴路，增加元件之磁飽和量，進而提昇積層晶片電感之直流疊加特性。本研究成功開發出積層型直流電源轉換器模組所需之關鍵技術:(1)具高起始導磁係數、高飽和磁通密度及高額定電流等磁特性之鎳銅鋅鐵氧磁體、(2)可與鎳銅鋅鐵氧磁體共燒之非磁性介質材料、(3)大面積鐵氧磁體基板之束縛燒結技術。

Due to the advances in mobile communications, not only the electronic devices are getting smaller, but also their functions are upgraded continuously. Discrete components cannot completely meet the requirements of miniaturization. Moreover, portable devices continue to develop toward low-profile and multi-functionality, which results in the diversification of operating voltages. Therefore, the demand for integrating individual components into modules to reduce the size and increase the power density for DC-DC converters is increasing.
Therefore, to prepare the large-area power NiCuZn ferrite substrate has become an important issue. In this study, the additional of Bi2O3 effects on the densification mechanism, magnetic properties and DC superposition behavior of NiCuZn ferrites were investigated. Through these investigations the densification mechanism of NiCuZn ferrites added with Bi2O3 was proposed and a suitable compromise between the initial permeability and DC-bias superposition characteristic can be obtained by adding the proper amount of Bi2O3. Moreover, this study also integrated magnetic ZrO2 green sheets acting simultaneously as the magnetic gap and constraining layer ceramic processing and low-pressure assisted constrained sintering technologies to prepare large area NiCuZn ferrite substrates.
This study successfully developed the key technologies for making a DC-DC converter module: (1) a low temperature sintering NiCuZn ferrites with superior DC-bias-superposition characteristics, (2) the nonmagnetic material co-fired with the magnetic NiCuZn ferrites, (3) the low-pressure assisted constrained sintering process for the large area NiCuZn ferrites substrates.

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