Boris Saje

Boris Saje
Jožef Stefan Institute | IJS · Department of Nanostructured Materials

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12
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Publications

Publications (12)
Article
Full-text available
Magnetic micro-actuators and systems (MAGMAS) require tiny permanent magnets with dimensions of hundreds of micrometers. Such magnets need to have the highest possible energy density, which means Nd–Fe–B magnets are the most appropriate type. Most bottom-up fabrication techniques are either too slow or too expensive; top-down techniques involving m...
Article
Magnetic micro-actuators and systems require tiny permanent magnets with dimensions of hundreds of micrometres. Such magnets need to have the highest possible energy density, which means Nd–Fe–B is the most appropriate material. Most bottom-up fabrication techniques are either too slow or too expensive; top-down techniques involving machining tend...
Article
Magnetic micro-actuators and systems (MAGMAS) require tiny permanent magnets with dimensions of hundreds of micrometers. Such magnets need to have the highest possible energy density, which means Nd-Fe-B magnets are the most appropriate type. Most bottom-up fabrication techniques are either too slow or too expensive; top-down techniques involving m...
Article
The nitrogenation behaviour of a SmFeTa based alloy which can be used for the preparation of SmFeN based permanent magnets has been described. Diffusion experiments on thin polished plates provided the nitrogenation processing parameters. Thermomagnetic analysis of partially and fully nitrided powders showed that the required nitrogenation time...
Article
The magnetic properties and microstructure of cast and annealed Sm2Fe17−xTax (0 ≤ x ≤ 2) alloys were investigated by means of microstructural, X-ray diffraction and thermomagnetic analysis. A process for obtaining the Sm2Fe17 phase nearly free of iron in the as-cast state is described. The method consists of adding 5 at% of Ta to the melt. By this...
Article
Niobium-modified Sm2Fe17 powders were nitrided in pure nitrogen for a range of times and investigated using thermomagnetic analysis, scanning electron microscopy, optical microscopy and electron probe microanalysis (EPMA). Thermomagnetic analysis showed that, on nitriding the Curie point of the core increases continually until the whole particle ha...
Article
The microstructure and magnetic properties of Sm<sub>2</sub>Fe<sub>17-x</sub>Ta<sub>x</sub>(0&les;x&les;2) cast alloys were investigated by means of microstructural and thermomagnetic analysis. A process for obtaining the Sm<sub>2</sub>Fe<sub>17</sub> phase nearly free of iron in the as-cast state is described. The method consists of adding 4 to 5...
Article
The positive influence of ZrO<sub>2</sub> addition on the magnetic properties, temperature coefficients and corrosion resistance of Nd-Dy-Fe-B magnets were established. The improvements in these parameters were attributed to microstructural changes. The phase composition was analyzed using HREM, and besides the known phases, an additional Zr boride...
Article
The influence of the alloy granulation grade, temperature and surface oxidation on the kinetics and the course of the fracture processes during the hydrogenation of Nd16-xDyxFe76B8 (x=0–3) alloy was studied. The average particle sizes of the alloy were 1 mm, 5 mm and 3 cm and the temperature range between 20 and 200 °C. Pre-oxidation times of the a...
Article
The microstructure of Nd-Dy-Fe-B magnets can be refined and, consequently, the coercivity of sintered magnets can be improved with the addition of small amounts of ZrO2. By such an addition the temperature coefficients of the magnetic properties were found to be smaller. The microstructure has been examined by means of optical microscopy and high-r...
Article
The course of the fracture processes during the hydrogenation of the Nd16-xDyxFe76B8 alloy (x = 0 to 3) was studied. Positive volume changes of hydrogenated Nd-rich phase cause intergranular cracks between the grains of the Nd2Fe14B matrix phase. Hydrigen easily penetrates through those cracks into the alloy itself and the hydrogenation of the matr...

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