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Article Dans Une Revue Journal of Magnetism and Magnetic Materials Année : 2017

Magnetic ageing study of high and medium permeability nanocrystalline FeSiCuNbB alloys

Résumé

Increasing the energy efficiency is one of the most important issues in modern power electronic systems. In aircraft applications, the energy efficiency must be associated with a maximum reduction of mass and volume, so a high components compactness. A consequence from this compactness is the increase of operating temperature. Thus, the magnetic materials used in these applications, have to work at high temperature. It raises the question of the thermal ageing problem. The reliability of these components operating at this condition becomes a real problem which deserves serious interest. Our work takes part in this context by studying the magnetic material thermal ageing. The nanocrystalline materials are getting more and more used in power electronic applications. Main advantages of nanocrystalline materials compared to ferrite are: high saturation flux density of almost 1.25 T and low dynamic losses for low and medium frequencies. The nanocrystalline Fe73.5Cu1Nb3Si15.5B7 alloys have been chosen in our aging study. This study is based on monitoring the magnetic characteristics for several continuous thermal ageing (100, 150, 200 and 240 °C). An important experimental work of magnetic characterization is being done following a specific monitoring protocol. Elsewhere, X-Ray Diffraction and magnetostriction measurements were carried out to support the study of the anisotropy energies evolution with ageing. This latter is discussed in this paper to explain and give hypothesis about the ageing phenomena.
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Dates et versions

hal-01624337 , version 1 (26-10-2017)

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Atef Lekdim, Laurent Morel, Marie-Ange Raulet. Magnetic ageing study of high and medium permeability nanocrystalline FeSiCuNbB alloys. Journal of Magnetism and Magnetic Materials, 2017, 428, pp.260 - 268. ⟨10.1016/j.jmmm.2016.12.103⟩. ⟨hal-01624337⟩
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