Abstract
In this study the soft magnetic alloy Fe-3Si-0.75P (wt%) was obtained by mechanical alloying through powder metallurgy. The processing included the formulation of metallic powder, wet milling for 1 h, 3 h, 6h and 9 h, in an attritor mill using alcohol P.A. as a lubricant. Cold compaction was then performed in a floating die under 600 MPa pressure and, finally the ring-shaped test specimens were sintered at 1150 °C for 1h. The electrical, physical and magnetic properties were then analyzed using the following assays: Laser granulometry, density, metallography, hysteresis curve and AC permeability, resistivity and XRD. The results showed a strong influence of milling time on magnetic properties of the alloy. There was a decrease in grain size with the milling time, which is likely the cause of increased in magnetic properties.
Highlights
A soft magnetic material may be used as an efficient flow multiplier in a great variety of devices, presenting challenges for the understanding of their properties, preparation and characterization[1]
A functional powder processing technique that can produce a variety of alloys with phases in balance or non-balance is mechanosynthesis
After the increasing of the milling there is a slight increase in the apparent density of the powder. This reduction was, in a way, expected, because of the internal deformation of the particles caused by mechanosynthesis performed with high energy
Summary
A soft magnetic material may be used as an efficient flow multiplier in a great variety of devices, presenting challenges for the understanding of their properties, preparation and characterization[1]. Soft magnetic materials come in various forms, ranging from pure iron used in inductor cores, sheets of rolled silicon steel sheets, nanocrystalline or amorphous bands for transformers, and ferrites for electromagnetic interference filters (EMI)[2]. The characteristics of these materials are their high permeability, low remanence and coerciveness, high induction of saturation, low energy loss by hysteresis and low loss by Foucault currents in alternated flux applications[3]. A functional powder processing technique that can produce a variety of alloys with phases in balance or non-balance is mechanosynthesis The advantage of this technology is that the powder can be produced in large quantities and the processing parameters can be controlled. Due to a great plastic deformation, the resulting powder mixture reduces the interdiffusion distance of the constituent elements on the order of micrometers[9]
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