Abstract
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 ?-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 ?-Fe2O3 crystalline phase and attained already optimum density (? ? 4.8 g/cm?) i.e. observed low level of porosity. Attained relative magnetic permeability ?r ? 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.
Highlights
Soft magnetic ferrites are used as cores in modern electronic components such as recording heads, filters, switching power supply transformers, amplifiers, etc
The primary motivation behind the research on soft magnetic properties of MnZn ferrites prepared by Powder Injection Moulding (PIM) route is to improve their magnetic permeability, as it is well known that high permeability is accompanied by low power losses in magnetic cores
Zlatkov et al showed that lower density and, higher porosity were obtained for MnZn samples sintered in argon and nitrogen, indicating the effect of sintering atmosphere on the resulting sample density and porosity [12]
Summary
Soft magnetic ferrites are used as cores in modern electronic components such as recording heads, filters, switching power supply transformers, amplifiers, etc. This paper deals with MnZn ferrites produced by Powder Injection Moulding (PIM) technology. This technology can produce a number of ferrites in very shorter time compared to the classic method, i.e. it offers large scale manufacturing of small and geometrically complex parts. Soft magnetic properties of the MnZn ferrite sample prepared by PIM method and afterwards sintered in air were presented. The primary motivation behind the research on soft magnetic properties of MnZn ferrites prepared by PIM route is to improve their magnetic permeability, as it is well known that high permeability is accompanied by low power losses in magnetic cores
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
