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Information × Registration Number 0213U008180, 0113U000758 , R & D reports Title Development of hydrogen technologies of microstructure refining of R2Fe14B-based alloys for improvement of permanent magnets properties popup.stage_title Head Bulyk Ihor, Доктор технічних наук Registration Date 26-12-2013 Organization Karpenko Physico-Mechanical Institute of the National Academy of Science of Ukraine popup.description2 The influence of milling conditions and environmental of zirconium doped neodymium- iron-boron alloys on features of hydrogenation, disproportionation, desorption and recombination (HDDR) at low hydrogen pressures and the magnetic anisotropy of the obtained powders was investigated by means of scanning electron microscopy (SEM), differential thermal (DTA), X-ray phase (XRD) and elemental analysis. Nd16Fe73.9Zr2.1B8 alloy was studied at hydrogen pressures below 0.1 MPa and temperatures below 700 °C during hydrogenation disproportionation (HD) and at temperatures up to 900 °C during desorption, recombination (DR). The alloy was milled in hydrogen and hydrogen saturated alloy also was milled in oleic acid. It was shown that powder particles are anisotropic with low dispersion (5-10 microns) at low milling frequency. The increase of milling frequency leads to the reduction of powder particles size to 100-350 nm, but they are isotropic through agglomeration in the result of mechanical fusion. The milling of hydrogen saturated alloy in oleic acid prevents agglomeration of anisotropic powder fine particles. HDDR conditions in milled alloy were established. Nd16Fe73.9Zr2.1B8 alloy powders disproportionate at hydrogen pressures below 1 atm. These powders have high reactivity. The neodymium oxidation was observed during heating in forevacuum both at disproportionation and recombination. Influence of preparation methods magnets on their anisotropy and density was estimated. Product Description popup.authors Борух Ігор Володимирович Бурховецький Валерій Вікторович Тростянчин Андрій Миколайович popup.nrat_date 2020-04-02 Close