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URN etd-0629106-115342 Statistics This thesis had been viewed 3149 times. Download 3296 times. Author Hsin-Chaio Fang Author's Email Address email@example.com Department Materials Engineering Year 2005 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 102 Title Study on the optimization of additives on the low loss of Mn-Zn Ferrite Keyword magnetocrystalline anisotropy initial permeability hysteresis loss eddy current loss eddy current loss hysteresis loss initial permeability magnetocrystalline anisotropy Abstract In order to achieve high grain boundaries resistivity which results in a reduction in eddy current loss of Mn-Zn ferrites，various additives had been cooperated with a Mn0.77Zn0.152Fe2.078O4 ferrite which were prepared by traditional ceramic fabrication processes。Those additives included SiO2 、TiO2、ZrO2 and Al2O3 which were prepared by sol-gel method。The powder was dry pressed at a pressure to form the ring cores and sintered at 1325℃ in N2 atmosphere 3h。The results showed that SiO2 induces the abnormal grain growth and increases the eddy current loss，also increases power loss。TiO2 can reduce the power loss because it can lower eddy current loss effectively，the lowest power loss was observed at TiO2/100ppm。When ZrO2 content was 100ppm it can suppress grain growth and lower power loss。For Al2O3，it can lower Hysteresis loss effectively and the lowest power loss was observed at 400ppm Al2O3。 Advisor Committee Yi Hu - advisor
Chih-Wen Hsieh - co-chair
Hur-Lon Lin - co-chair
Files Date of Defense 2006-06-19 Date of Submission 2006-06-29