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Development of high temperature and high Bs low-power Mn-Zn ferrite

Author: ZhaoHui
Tutor: LanZhongWen
School: University of Electronic Science and Technology
Course: Materials Science and Engineering
Keywords: MnZn ferrite Microstructures Saturation magnetic induction Power loss DC superposition
CLC: TM277
Type: Master's thesis
Year: 2011
Downloads: 61
Quote: 0
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Abstract


With the rapid development of power electronics technology, ferrite soft magnetic materials used in which the ever-increasing demands. Requires not only the material at high temperatures with lower power consumption, and requires a high temperature with high saturation magnetic flux density Bs. Ferrite developed to simultaneously achieve low-power and high-temperature and high Bs difficulty urgent need of such stable market and can effectively improve the material devices convert power. In recent years, the high temperature and high Bs low power MnZn ferrite has become a hot research at home and abroad. In this paper, prepared oxide ceramic high-temperature and high Bs low power MnZn ferrite materials, targets both under high temperature high saturation magnetic flux density and low power consumption, the main research the the master recipe Fe 2 3 O and ZnO ratio between the calcining temperature, additives, and molding pressure on the the MnZn ferrite microstructure and magnetic energy. The experimental results show that: in the 53.5 5 within the range of from 5.0 mol%, O With the of Fe 2 3 increasing proportion of the initial permeability first increased after decline, the saturation magnetic flux density and the Curie temperature monotonically increasing; 5.75 6 .50 mol% range, with increasing ZnO proportion of the initial permeability first increased and then decreased, the saturation magnetic flux density is increased at first and then decreased. The appropriate master recipe: Fe 2 3 O : MnO: ZnO = 54.5mol%: 39.25mol%: 6.25mol%. Are 800 9 20 ° C temperature range, with the calcining temperature rise, Powder activity gradually reduce the saturation magnetic flux density and sintered density first increased and then decreased. Suitable calcining temperature of 890 ℃. Add a small amount of CaC3 O help ferrite reduced power consumption, the sintered density first increased and then decreased, the saturation magnetic flux density first increased and then decreased. Appropriate dosage 500ppm. The addition of NiO can contribute to the improvement of the sintered density, ferrite saturation flux density first increased and then decreased, the high temperature of 100 ° C under ΔB (ΔB = Bs-Br) first increased and then decreased. Appropriate dosage 400ppm. When adding V 2 O 5 when sintered density of the material and the saturation magnetic flux density showed a trend of increased and then decreased after the first decline in material loss rise, ferrite changes in the DC superposition characteristics of ΔB. When V 2 O 5 additive is 500ppm, the initial permeability of the material, high temperature BS has a maximum value, respectively, for 2035,446 mT. Minimum high temperature power consumption for 385mW/cm 3 . With the improvement of the molding pressure, green density continuously improve the sintered density and not continue to increase, a trend first and then decreased. Obtain maximum when molding pressure 80MPa, the saturation magnetic flux density of the ferrite.

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CLC: > Industrial Technology > Electrotechnical > Electrical materials > Magnetic materials,ferrite > Ferrite,oxide magnetic materials
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