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| Influence of CaO and V2O5 on high frequency MnZn power ferrite |
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| 电子科技大学微电子与固体电子学院 |
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Cite this article:
. Influence of CaO and V2O5 on high frequency MnZn power ferrite. Chin J Mater Res, 2004, 18(2): 176-180.
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Abstract The high frequency MnZn power ferrite was prepared by the conventional
oxide ceramic process. The more quantity of CaO is needed to increase
the grain boundary resistivity and suppress the eddy current loss of the
high frequency MnZn power ferrite applied at frequencies higher than
500 kHz. An optimum concentration of V$_{2}$O$_{5}$ acting indirectly via
liquid phase formation and influencing the microstructural development
during sintering makes the crystalline grain be refined, the amount of
grain boundary and grain boundary resistivity increase, the porosity
decrease, and the power losses be suppressed. Adopting the complex
additives containing 0.3, 0.15 and 0.1\% by weight of CaO, TiO$_{2}$ and
V$_{2}$O$_{5}$, respectively, the MnZn power ferrite cores with initial
permeability of about 1500, low power loss of about 130 mW$\cdot$cm$^{-3}$
(500 kHz, 50 mT, 25℃), grain diameter of 3$\sim$5 $\mu$m and low
porosity can be prepared.
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Received: 21 May 2004
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