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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

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ISSN Imprimer: 1093-3611

ISSN En ligne: 1940-4360

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ZrO2/ZrN MULTILAYERS ON BARE SINTERED NdFeB MAGNETS BY ION-PLASMA DEPOSITION WITH PULSED BIASING

Volume 24, Numéro 1, 2020, pp. 9-20
DOI: 10.1615/HighTempMatProc.2020033231
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RÉSUMÉ

Surface modification with nanocrystalline ZrO2/ZrN multilayers was performed on bare sintered NdFeB permanent magnets to improve their corrosion properties. The multilayers were deposited by ion-plasma vacuum-arc evaporation technique with curvilinear magnetic filter reducing amount of macro-particles emitted from cathode spots and using pulsed biasing mode for elimination of micro-arcs formation. The structure, chemical and phase compositions have been investigated by means of X-ray diffraction (XRD), scanning electron microscope (SEM) with energy-dispersive X-ray analysis (EDX) and X-ray fluorescence (XRF) methods. Mechanical and tribological properties were evaluated using a ball-on-disc method, Vickers microhardness and nanoindentation tests, respectively. The influence of the obtained coatings in terms of their barrier properties for corrosion in a quasi-physiological 0.9% NaCl solution has been studied. The coating had a thickness of 10 μm and achieved hardness of up to 26-30 GPa. The proposed technology, in particular, would be prospective for application of buffer multilayered coatings on NdFeB magnets used as repelling devices in orthodontics.

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