Soft magnetic properties of MnZn ferrites prepared by powder injection moulding
In this study, properties of soft-magnetic manganese zinc ferrite manufactured by powder injection moulding - PIM technology were presented. A powder consisting of Mn1- xZnxFe2O4 with small addition of hematite □-Fe2O3 was mixed with an organic binder (wax and thermoplastic) to form ferrite feed...
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| Format: | Article |
| Language: | English |
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International Institute for the Science of Sintering, Beograd
2012-01-01
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| Series: | Science of Sintering |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/0350-820X/2012/0350-820X1203355M.pdf |
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| author | Mitrović N.S. Zlatkov B.S. Nikolić M.V. Maričić A.M. Aleksić O.S. Đukić S.R. Danninger H. |
| author_facet | Mitrović N.S. Zlatkov B.S. Nikolić M.V. Maričić A.M. Aleksić O.S. Đukić S.R. Danninger H. |
| author_sort | Mitrović N.S. |
| collection | DOAJ |
| description | In this study, properties of soft-magnetic manganese zinc ferrite manufactured by powder injection moulding - PIM technology were presented. A powder consisting of Mn1- xZnxFe2O4 with small addition of hematite □-Fe2O3 was mixed with an organic binder (wax and thermoplastic) to form ferrite feedstock. The ferrite feedstock was injected in a mould with a cavity shaped like a small cylinder with a hole on the main axis. Injection moulded samples were then solvent, thermally debinded and sintered in air atmosphere. Structure of sintered sample was characterized using X-ray diffractometry, scanning electron microscopy and thermomagnetic measurements. Magnetic properties were measured by hysteresis graph at different frequencies up to 1 kHz. Sintered sample contains a mixture of two phases Mn0.6Zn0.4Fe2O4 (68 wt. %) and α-Fe2O3 (32 wt. %). The Curie temperature is TC ≈ 220°C for the green sample but after the heating up to 470°C, TC increase up to about 300°C. The high increase of normalized magnetic permeability of about 800 % was observed due to melting and burning of binder. The hysteresis loop of sintered MnZn ferrite toroidal cores has an R-shape with saturation of 0.44 T and remanence ratio of 0.49. The low value of coercivity (only 47 A/m) was related to the presence of α-Fe2O3 crystalline phase and attained already optimum density (ρ ≈ 4.8 g/cm³) i.e. observed low level of porosity. Attained relative magnetic permeability μr ≈ 2000 as well as power losses Ps ≈ 21 W/kg for sintered sample (at 1 kHz; 0.39 T) is in agreement with the MnZn ferrite commercial samples. [Projekat Ministarstva nauke Republike Srbije, br. OI 172057] |
| first_indexed | 2024-12-10T13:57:11Z |
| format | Article |
| id | doaj.art-854f4c05fe43475ba0feee148c4d7265 |
| institution | Directory Open Access Journal |
| issn | 0350-820X |
| language | English |
| last_indexed | 2024-12-10T13:57:11Z |
| publishDate | 2012-01-01 |
| publisher | International Institute for the Science of Sintering, Beograd |
| record_format | Article |
| series | Science of Sintering |
| spelling | doaj.art-854f4c05fe43475ba0feee148c4d72652022-12-22T01:45:55ZengInternational Institute for the Science of Sintering, BeogradScience of Sintering0350-820X2012-01-0144335536410.2298/SOS1203355MSoft magnetic properties of MnZn ferrites prepared by powder injection mouldingMitrović N.S.Zlatkov B.S.Nikolić M.V.Maričić A.M.Aleksić O.S.Đukić S.R.Danninger H.In this study, properties of soft-magnetic manganese zinc ferrite manufactured by powder injection moulding - PIM technology were presented. A powder consisting of Mn1- xZnxFe2O4 with small addition of hematite □-Fe2O3 was mixed with an organic binder (wax and thermoplastic) to form ferrite feedstock. The ferrite feedstock was injected in a mould with a cavity shaped like a small cylinder with a hole on the main axis. Injection moulded samples were then solvent, thermally debinded and sintered in air atmosphere. Structure of sintered sample was characterized using X-ray diffractometry, scanning electron microscopy and thermomagnetic measurements. Magnetic properties were measured by hysteresis graph at different frequencies up to 1 kHz. Sintered sample contains a mixture of two phases Mn0.6Zn0.4Fe2O4 (68 wt. %) and α-Fe2O3 (32 wt. %). The Curie temperature is TC ≈ 220°C for the green sample but after the heating up to 470°C, TC increase up to about 300°C. The high increase of normalized magnetic permeability of about 800 % was observed due to melting and burning of binder. The hysteresis loop of sintered MnZn ferrite toroidal cores has an R-shape with saturation of 0.44 T and remanence ratio of 0.49. The low value of coercivity (only 47 A/m) was related to the presence of α-Fe2O3 crystalline phase and attained already optimum density (ρ ≈ 4.8 g/cm³) i.e. observed low level of porosity. Attained relative magnetic permeability μr ≈ 2000 as well as power losses Ps ≈ 21 W/kg for sintered sample (at 1 kHz; 0.39 T) is in agreement with the MnZn ferrite commercial samples. [Projekat Ministarstva nauke Republike Srbije, br. OI 172057]http://www.doiserbia.nb.rs/img/doi/0350-820X/2012/0350-820X1203355M.pdfMnZn ferritePIM technologysinteringX-ray diffractionscanning electron microscopymagnetic hysteresis properties |
| spellingShingle | Mitrović N.S. Zlatkov B.S. Nikolić M.V. Maričić A.M. Aleksić O.S. Đukić S.R. Danninger H. Soft magnetic properties of MnZn ferrites prepared by powder injection moulding Science of Sintering MnZn ferrite PIM technology sintering X-ray diffraction scanning electron microscopy magnetic hysteresis properties |
| title | Soft magnetic properties of MnZn ferrites prepared by powder injection moulding |
| title_full | Soft magnetic properties of MnZn ferrites prepared by powder injection moulding |
| title_fullStr | Soft magnetic properties of MnZn ferrites prepared by powder injection moulding |
| title_full_unstemmed | Soft magnetic properties of MnZn ferrites prepared by powder injection moulding |
| title_short | Soft magnetic properties of MnZn ferrites prepared by powder injection moulding |
| title_sort | soft magnetic properties of mnzn ferrites prepared by powder injection moulding |
| topic | MnZn ferrite PIM technology sintering X-ray diffraction scanning electron microscopy magnetic hysteresis properties |
| url | http://www.doiserbia.nb.rs/img/doi/0350-820X/2012/0350-820X1203355M.pdf |
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