Preparation of low-power loss MgCuZn ferrites using the microwave sintering method

A reduction in size and weight of power supplies can be achieved by using switched mode or resonant concepts. For the voltage conversion several circuit designs are in use with ferrites as transformer core materials. Transformer ferrites must show low energy losses at high induction levels at higher...

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Published inJournal of materials science Vol. 39; no. 11; pp. 3787 - 3791
Main Authors BHASKAR, A, RAJINI KANTH, B, MURTHY, S. R
Format Journal Article
LanguageEnglish
Published Heidelberg Springer 01.06.2004
Springer Nature B.V
Subjects
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Electrotechnical and electronic ceramics
Exact sciences and technology
Materials science
Microwave sintering
Power loss
Technical ceramics
Scanning electron microscopy
Temperature effect
Microwave
Zinc Oxides
Experimental study
X ray diffraction
Oxide ceramics
Copper Oxides
Ferrites
Iron Oxides
Copper Iron Magnesium Zinc Oxides Mixed
Magnetic permeability
Sintering
Manufacturing
Microstructure
Magnesium Oxides
Electroceramics
Magnetic properties
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Summary:A reduction in size and weight of power supplies can be achieved by using switched mode or resonant concepts. For the voltage conversion several circuit designs are in use with ferrites as transformer core materials. Transformer ferrites must show low energy losses at high induction levels at higher and higher frequencies. This requires development of new ferrite materials with constantly improving loss characteristics. To reduce the power loss, both hysteresis loss and eddy current loss should be suppressed by the available preparation technique. In this connection, it was found that the microwave sintering technique markedly enhanced the densification rate at lower sintering temperature of the material. In this method of preparation, the material can absorb the microwaves and self-generate heat. Recently, we have developed low temperature sintered MgCuZn ferrites used for multilayer chip inductors. These ferrites were conventionally sintered at 910DGC/12 hr. In continuation of this work, microwave sintered MgCuZn ferrites were selected for this investigation. The total power loss was measured.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0022-2461
1573-4803
DOI:10.1023/B:JMSC.0000030739.41496.fc