| With the rapid development of the new energy industry,as an important material which is widely used in energy conversion devices,magnetic powder core has become a vital research point.As a material with relatively good magnetic properties,high-abundance rare earth Y is currently accumulating in large quantities,which is extremely unfavorable to the sustainable use of the rare earth resources in our country.Therefore,the development of new applications of high-abundance rare earth Y also needs to be solved urgently.Due to the characteristics of low loss,high magnetic permeability,high saturation magnetic induction,high resistivity,excellent magnetic and thermal isotropy,wide operating frequency range and etc.,metal/alloy soft magnetic powder cores are widely used in telecommunications,radar,television,In the power supply and other technologies as the inductive filters,an FM choke coils and switching power supplies.As modern communication technology and computer industry rapidly develop,higher requirements are put forward for the performance of metal soft magnetic powder cores.At the same time people’s demand for them is also growing.Thus,improving the performance of metal magnetic powder cores and optimizing the forming process are the current research hotspot.In this paper,the preparation process,microstructure and soft magnetic properties of Fe Si Y alloy magnetic powder cores are studied.First of all,the flake Fe Si Y alloy powder was prepared,and the organization and electromagnetic parameters of the powder were analyzed.Then,the cladding,molding and annealing treatment processes of the organics/Fe Si Y alloy magnetic powder cores and Si O2/Fe93.5Si4.3Y2.2 alloy magnetic powder cores made of flake Fe Si Y alloy powders were optimized in more detail,and the soft magnetic properties of the cores were analyzed.Finally,the ferrite/Fe93.5Si4.3Y2.2 magnetic powder core was prepared by SPS sintering molding process,the SPS sintering process and annealing treatment mechanism were studied,and the ferrite/Fe93.5Si4.3Y2.2 alloy magnetic powder core with excellent comprehensive soft magnetic properties was optimized.It is shown that the powder coating process,annealing treatment temperature and forming method have a great influence on the effective permeability and frequency stability of the magnetic powder core.The organics/Fe93.5Si4.3Y2.2 alloy magnetic powder core prepared by molding has an effective magnetic permeability（μe）of 91 at1k Hz after annealing at 700℃*1h.By reducing the annealing treatment temperature and extending the holding time,the effective permeability,maximum quality factor,andΔμDC of this magnetic powder core after annealing at 500°C*2 h treatment are59.23,20.19,and 43.22%,respectively,showing great frequency stability.The molded Si O2/Fe93.5Si4.3Y2.2 alloy powder cores exhibit better frequency stability than the organics/Fe93.5Si4.3Y2.2 alloy powder cores,in which the effective permeability of the Si O2/Fe93.5Si4.3Y2.2 alloy powder cores annealed at 700°C is about 67.The maximum effective permeability andΔμDC of the ferrite/Fe93.5Si4.3Y2.2 alloy powder cores prepared by the SPS sintering process at a temperature rise rate of 100°C/min and a sintering process of 400°C*20 min were 36.6 and 57.33%,showing relatively good frequency stability and relatively high effective permeability,and showed excellent overall magnetic properties.magnetic properties. |
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