Effect of sintering enclosures and sintering parameters on the magnetic properties of a high permeability manganese-zinc ferrite

Manganese-zinc ferrite (Mn/sub 0.52/Zn/sub 0.41/Fe/sub 2.07/O/sub 4/) has been prepared by the mixed-oxide route. Specimens were in the form of toroids, pressed in the green state to 11.9 mm outside diameter and 5.9 mm inside diameter. To assess the effect of zinc loss, a variety of circular local s...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2000-01, Vol.36 (1), p.375-380
Main Authors: Kilbride, I.P., Freer, R.
Format: Article
Language:English
Subjects:
Atmosphere
Atmospheres
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cooling
Density
Enclosures
Exact sciences and technology
Fe and its alloys
Ferrite
Ferrites
Firing
Grain size
Iron
Magnetic properties
Magnetic properties and materials
Magnetism
Permeability
Physics
Sintering
Studies of specific magnetic materials
Temperature distribution
Zinc
Zinc ferrites
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Summary:Manganese-zinc ferrite (Mn/sub 0.52/Zn/sub 0.41/Fe/sub 2.07/O/sub 4/) has been prepared by the mixed-oxide route. Specimens were in the form of toroids, pressed in the green state to 11.9 mm outside diameter and 5.9 mm inside diameter. To assess the effect of zinc loss, a variety of circular local sintering enclosures were employed. All specimens were initially sintered in air at 1390/spl deg/C for times of 7.5-16 h. After cooling to 1200/spl deg/C they were held for 4 h in atmospheres containing 0.0125-0.05% oxygen. Sintered products were single-phase, with density greater than to 95% theoretical and a grain size of about 20 /spl mu/m. Use of a partial sintering enclosure led to a 45% increase in initial permeability /spl mu//sub i/, but use of a full enclosure led to a reduction in /spl mu//sub i/. Firing the samples at 1200/spl deg/C in an atmosphere containing initial permeability was maximized (about 10200) over a wide range of temperatures 25-90/spl deg/C. The eddy current losses in such samples were twice as high as for samples sintered in an oxygen atmosphere containing 0.05% oxygen.
ISSN:0018-9464
1941-0069
DOI:10.1109/20.822550