Rare earth permanent magnets perform an important role in the electromagnetic devices industry, particularly in the production of hybrid and electric vehicle engines and generators for wind turbines. With the recent Chinese restriction on the export of rare-earth elements, the increasing prices and the need to replace the Dy in the permanent magnets, there is a worldwide interest in alternatives to these issues. The addition of alloying elements on rare-earth permanent magnets is one of the methods used to improve the magnetic properties. This present work evaluates the influence of Ti, V, Cr, Ni, Zr, Nb and Mo as alloying elements on the microstructure and magnetic properties of sintered Pr-Fe-CoB based permanent magnets. The permanent magnets were produced by the conventional powder metallurgy route using powder obtained by hydrogen-decrepitation (HD) method. In order to produce the magnet Pr 16 Fe 66,9 Co 10,7 B 5,7 Cu 0,7 without alloying elements the mixture of alloys method was employed, mixing two compositions: Pr 20 Fe 73 B 5 Cu 2 (33% w.t) and Pr 14 Fe 64 Co 16 B 6 (67% w.t). With the purpose of evaluating the influence of the alloying elements, the Pr 14 Fe 64 Co 16 B 6 M 0,1 (where M= Ti, V, Cr, Ni Zr, Nb or Mo) (67% w.t) alloy was employed. The characterization of the alloys and the magnets was carried out using scanning electron microscopy (SEM), X-ray diffraction (XRD) and the magnetic properties were measured using a permeameter. The magnet with Cr addition (i H c = 836 KA.m-1) presented intrinsic coercivity 11,8% higher in comparsion with the magnet without any addition (i H c =
Rare earth permanent magnets are essential components in many fields of technology due to their excellent magnetic properties. There are some techniques used in the manufacture of permanent rare earth magnets: the powder metallurgy to obtain anisotropic HD sintered permanent magnets and the melt spinning and HDDR processes to obtain isotropic and anisotropic bonded permanent magnets. In this work, the influence of the melt spinning parameters on the microstructural and magnetic properties of the Pr14FebalCo16B6 alloy was studied. The alloy was melted and rapidly cooled at 9.9 x 105°C/s. The parameters used in the process were: wheel speed of 15 m/s and 20 m/s and ejection pressure of 25.3 kPa and 50.7 kPa. Ribbons and/or flakes of 30 μm thickness and width until 5 mm were obtained. Results show that the melt spinning alloys are nanocrystalline and that the parameters of the process influence the microstructure and their magnetic properties. Mean crystallite size up to 38.5 nm and intrinsic coercivity (iHc) up to 254 kA/m were obtained.
The addition of alloying elements on rare-earth permanent magnets is one of the methods used to improve the magnetic properties. This present work evaluates the influence of alloying elements such as Zr, Nb and Mo on the microstructure and magnetic properties of sintered Pr-FeCo-B based permanent magnets. The permanent magnets were produced by the conventional powder metallurgy route using powder obtained by hydrogen-decrepitation (HD) method from as cast alloys. In order to produce the magnet Pr16Fe66,9Co10,7B5,7Cu0,7 without alloying elements the mixture of alloys method was employed, mixing two compositions: Pr20Fe73B5Cu2 (33% w.t) and Pr14Fe64Co16B6 (67% w.t). With the purpose of evaluating the influence of the alloying elements, the Pr14Fe64Co16B6X0,1 (where X= Zr, Nb or Mo) (67% w.t) alloy was employed. The characterization of the alloys and the magnets was carried out using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDXS) and the magnetic properties were measured using a permeameter. The magnet without any additions presented the highest intrinsic coercivity (μ0iHc = 748 KA.m-1) while the magnet with Nb addition presented higher remanence (Br = 1,04 T). The magnet with Zr addition presented the highest maximum energy product (BHmáx = 144 KJ.m-3), and the magnet with Mo addition showed the highest squareness factor (SF = 0,73).
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