Control of Thermal Expansion Coefficient of Low Temperature Sintering Ferrites.

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  • 磁性材料　　低温焼結フェライトの線膨張係数の制御
  • テイオン ショウケツ フェライト ノ セン ボウチョウ ケイスウ ノ セイギョ

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Abstract

A one-chip type transformer is produced as an MHD (Multilayer-Hybrid-Circuit-Device) using a multilayer technology and it contributes to miniaturize of a DC/DC converter. In order to get high efficiency of this transformer, it is needed to reduce the residual magnetic flux neighborhoods of internal electrode. Therefore, the internal electrode is needed to cover with nonmagnetic oxide completely in MHD. However, the discrepancy of thermal expansion coefficient between these materials produces internal stress which causes a degradation of magnetic properties and internal cracks in the worst case. Many studies were reported about internal stress effect comes from the internal Ag electrode to produce high performance multilayer chip inductor. In this paper, a study about the thermal expansion coefficient of ferrites was performed to reduce the thermal expansion coefficient discrepancy between NiCuZn ferrite and CuZn ferrite. It was found that the thermal expansion coefficient was able to control by ferrite compositions and degree of raw materials mixing. And it was thought that the thermal expansion coefficient was affected by ferrite compositions as well as thermal vibration which was caused from imperfect match at the interface between a spinet structure and a residual unreacted oxide materials in sintered ferrite body.

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