不同表面改質劑對磁性材料界面與性能影響之研究

Effects of Different Surface Modifiers on the Interfacial Structure and Properties of Magnetic Materials

隨著電動車與高效能運算模組發展，模壓電感對磁性粉體之高頻穩定性與界面可靠度要求提高。本研究以羰基鐵粉（CIP）為基材，引入鈦酸酯偶聯劑Lica-38與矽烷偶聯劑APTES進行表面改質，探討其對結構、電性與磁性之影響。FTIR顯示Lica-38形成Ti–O–Fe鍵結，APTES則引入Si–O–Fe與Si–O–Si網絡；XRD證實皆維持α-Fe主相。電性與導磁量測結果指出，Lica-38有助提升致密度並在低至中頻區提供較高導磁率，而APTES可大幅提升電阻率並在高頻下維持較佳穩定性，顯示兩種改質劑適用於不同頻段模組設計。

With the rapid development of electric vehicles and high-performance computing, molded inductors face increasing demands on high-frequency stability and interfacial reliability. In this study, Carbonyl Iron Powder (CIP) was modified with a titanate coupling agent (Lica-38) and a silane coupling agent (APTES) to tailor its electrical and magnetic properties. FTIR confirmed Ti–O–Fe bonding for Lica-38 and Si–O–Fe/Si–O–Si networks for APTES, indicating successful surface functionalization. XRD showed that all samples retained theα-Fe phase without secondary phases. SEM/EDS revealed that Lica-38 formed a uniform thin coating that improved powder dispersion, whereas APTES produced a thicker organic layer with stronger carbon signals. Electrically, Lica-38 increased compact density but only slightly enhanced resistivity, while APTES maintained similar density to unmodified CIP yet raised resistivity by four orders of magnitude due to its continuous siloxane network. Permeability measurements showed that Lica- 38 yielded the highest initial permeability in the low–mid frequency range, whereas APTES exhibited the most stable response at high frequencies. These results demonstrate that appropriate surface modification of CIP can decouple densification from insulation and selectively optimize low-frequency permeability or high-frequency stability for molded inductor applications.