Advanced Magnetic Materials for Energy and Power Conversion Applications: Poster Session
Sponsored by: TMS Functional Materials Division, TMS: Magnetic Materials Committee
Program Organizers: Daniel Salazar, BCMaterials; Alex Leary, NASA Glenn Research Center; Markus Chmielus, University of Pittsburgh; Ryan Ott, Ames Laboratory; Arcady Zhukov, University of the Basque Country

Monday 5:30 PM
February 24, 2020
Room: Sails Pavilion
Location: San Diego Convention Ctr

Session Chair: Arkady Zhukov, UPV/EHU and Ikerbasque


E-1 (Invited): Core Losses in Co-rich Inductors with Tunable Permeability: Alex Leary1; Vladimir Keylin1; Ron Noebe1; Randy Bowman1; Grant Feichter1; Kevin Byerly2; Paul Ohodnicki2; Michael McHenry3; 1Nasa Glenn Research Center; 2NETL; 3Carnegie Mellon University
    Efficient inductor cores with tunable permeability enable a wide variety of power electronics applications. Scalable processing methods have been demonstrated in Co-rich metal amorphous nanocomposite materials to produce cores with relative permeability values between 20-2000. The impact of different processing methods on core losses will be discussed in terms of structure/property relationships. Measurement techniques for low permeability cores at relevant power levels will be presented and comparisons provided to other low permeability soft magnetic materials.

E-3: Magnetic Flux Density Dispersion on the Gaps of the FeSiNbCuB Nanocrystalline Block Core: Aleksandra Kolano-Burian1; Roman Kolano1; Przemyslaw Zackiewicz1; Marek Hreczka1; 1Lukasiewicz Research Network – Institute of Non-Ferrous Metals
     Reduction of losses during energy transformation is one of the main goals in the areas related to power electronics. Currently application of nanocrystalline soft magnetic materials like FINEMET allows the great reduction in core losses especially in the chokes coils, used mainly in the circuits, with the wide spectrum of high frequency harmonics. Present state-of-the-art shows, that there is no comprehensive knowledge about the value of the magnetic flux density dispersion Bd on the gaps of nanocrystalline core and the possibilities of its minimization. The magnetic flux density dispersion Bd is the source of local eddy currents, which are the cause of increase of power loss. A developed method for measuring the magnetic flux density dispersion Bd in the Fe73.5Si13.5B9Nb3Cu1 nanocrystalline cores with four gaps is presented together with the study of the effect of gap width and the method of its filling on the power losses in the core.

E-4: Processing and Properties of Low Porosity Cast SMC Cores: Piotr BŁyskun1; Grzegorz Łukaszewicz1; Grzegorz Cieślak2; Aleksandra Kolano-Burian3; Maciej Kowalczyk1; 1Faculty of Materials Science and Engineering, Warsaw University of Technology; 2Warsaw University of Technology; 3Institute of Non-ferrous Metals
    Cast resin-based cores have a few advantages over the sintered oxide-insulated SMCs despite having lower saturation and lower permeability. They can be freely designed and manufactured with almost no shape limitations. No compaction is necessary, thus stress-sensitive high-induction iron-based powders can be used as a magnetic material to increase the soft magnetic properties. The real challenge is to reduce the porosity of the cast or moulded cores, as pores are known to have a strong influence on the resulting SMC magnetic properties and its macroscopic cohesion as well. In this work we present our current results on optimization trials of such cores processing. By various technological treatments we were able to significantly reduce the porosity of cast SMC cores in shape of toroids from about 30 to only a few percent. This resulted in visible soft magnetic properties increase as well as power loss decrease.

E-5: Structure and Properties Evolution in Rapidly Annealed Fe67Co20B13 Amorphous Material: Maciej Kowalczyk1; Jarosław Ferenc1; Anna Wójcik2; Aleksandra Kolano-Burian3; Tadeusz Kulik1; Piotr Błyskun1; 1Warsaw University of Technology; 2Polish Academy of Sciences; 3Łukasiewicz Research Network
    The Fe67Co20B13 (at. %) metallic glass ribbons were isothermally annealed for 1 to 600 seconds in the several temperature (380, 400, 420, 440, 450, 460oC). Heat treatment was done between two hot metal blocks. So called rapid annealing allowed to heat up the ribbon to the final temperature within fraction of the second. The structure was investigated with DSC, XRD and TEM. In addition, DC hysteresis loops were recorded (Hmax = 660A/m and 27KA/m). All data’s were correlated, and compared to commercially available soft magnetic nanocrystalline magnetic materials. The properties of the obtained partially crystalline ribbons were attractive, although the alloy did not contain grain –refining elements. The material after annealing, in the optimal state, exhibited coercive field of about 20 A/m, and saturation induction on the level of 1,68 T, which make this alloy attractive for applications where soft magnetism and high induction are desired.

E-6: Transition Metal Based Nanostructured Hard Magnet: Kinjal Gandha1; Ikenna C. Nlebedim1; 1Ames Laboratory
    We will present our recent work in developing transition metal based hard permanent magnet using nanostructured materials. The ongoing investigations will focus on promising candidate materials of the type {Fe-Co}-X-Y (X = other 3d or 4d metals and Y= B, C, P or N) to develop high saturation magnetization materials that can be stabilized in tetragonal or hexagonal structures. For example, introduction of tetragonal distortion into the nanostructure of FeCo alloys yields materials possessing high values of magnetocrystalline anisotropy, coercivity and saturation magnetization. The first step towards this work, we experimentally synthesized anisotropic Co nanostructures by chemical synthesis approach (polyol process). Magnetic properties of the high-aspect-ratio nanostructures is enhanced by effectively utilizing the magnetocrystalline and shape anisotropy of these high magnetic moment materials. In next step critical Co will be substituted by Fe during the process. The effect of experimental synthesis parameters on morphology and magnetic properties will be discussed.

E-7: Tuning of Second Order Phase Transition of NiMnGa Heusler-type Glass-coated Microwires: Carlos Garcia1; Valentina Zhukova2; Sergei Shevyrtalov3; Mihail Ipatov2; Paula Corte-Leon4; Arcady Zhukov5; 1Universidad Técnica Federico Santa María, Valparaiso, Chile; 2University Basque Country, UPV/EHU; 3Immanuel Kant Baltic Federal University; 4University Basque Country, UPV/EHU; 5UPV/EHU, and Ikerbasque, Basque Foundation for Science
     The conventional preparation method of Heusler alloys is arc-melting followed by long high temperature annealing. Recently rapidly quenching technique has been successfully employed for the Heusler-type ribbons and wires preparation. The magnetic hysteresis that appears for first-order phase transitions may reduce the actual efficiency of the cooling process. Therefore, studies of the materials exhibiting the second-order phase transitions with a broader peak in the magnetic entropy change have attracted attention. We present our results on the tuning of the second-order phase transitions in Heusler-type NiMnGa glass—coated microwires prepared using Taylor-Ulitovsky method by annealing at temperatures ranging from 550 up to 750 oC.. The temperature dependence of magnetization, M(T), as well as the corresponding Curie temperatureare considerably affected by the annealing conditions (annealing temperature and duration).Mixing of glass-coated microwires annealed at different conditions within the same bunch allows tuning of M(T) dependence and hence obtain broader second-order phase transition.