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1
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Magnetic Properties of Nd_{12}Fe_{82}B_6 and Nd_{14}Fe_{80}B_6 Powders Obtained by High Temperature Milling

100%
Kaszuwara W., Michalski B.
Acta Physica Polonica A
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2012
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vol. 121
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issue 1
89-93
EN
The present paper describes a comparison of magnetic properties of Nd_{12}Fe_{82}B_6 and Nd_{14}Fe_{80}B_6 powders obtained by a new method of processing of Nd-Fe-B powders - high temperature milling. In this method the milling operation is carried out, entirely or only in the final stage, at high temperatures, so that the destruction of the Nd_2Fe_{14}B phase and its recombination occur simultaneously. In this way a powder with good magnetic properties immediately after milling was obtained. In the present experiments, the powder was subjected to high-energy milling for 17 h (until the material becomes amorphous) and then, the milling was continued for 0.5 h with the powder container being heated to an appropriate temperature or milled at high temperature during whole time of the process. Diffraction examinations have shown that the powder processed in this way contains the Nd_2Fe_{14}B phase. Its magnetic properties appear to depend on the applied temperature or milling time (at optimum temperature). The used method of processing leads to obtaining high-coercivity Nd-Fe-B powders. The magnetic properties of the material thus produced, in particular its coercivity, strongly depend on the milling temperature and milling time.
2
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Dependence Of The Structure And Magnetic Properties Of Cast Plate-Shaped Nd60Fe30Al10 Samples On Their Thickness

81%
Kaszuwara W., Michalski B., Latuch J., Pawlik P.
Archives of Metallurgy and Materials
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2015
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issue 3
3
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Magnetization Reversal Processes in Pr-Fe-B-type Nanocrystalline Magnets

81%
Pawlik K., Pawlik P., Kaszuwara W., Wysłocki J.
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vol. 126
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issue 1
186-187
EN
The magnetization reversal processes in magnets derived from rapidly solidified Pr_{9}Fe_{52}Co_{13}Zr_{1}Nb_{4}B_{21} alloy samples were studied by analysis of minor hysteresis loops and recoil curves. The studies were carried out on suction-cast 1 mm diameter rod, 1 mm thick plate, 3 mm outer diameter (o.d.) tube and melt-spun ribbon samples subjected to annealing at 983 K for 5 min. The X-ray diffraction analysis has shown multiphase constitution of the samples. Structural and magnetic studies indicated that the initial state of microstructure and phase composition affects the magnetization reversal processes in annealed samples due to a variation of microstructure in samples of various shapes. Magnetic studies allowed estimation of the mean values of nucleation and pinning fields that control the magnetization reversal processes.
4
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Glass Forming Abilities and Crystallization Process in Amorphous Pr-Fe-Co-Zr-Nb-B Alloys of Various B Content

81%
Pawlik K., Pawlik P., Kaszuwara W., Wysłocki J.
Acta Physica Polonica A
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2017
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vol. 131
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issue 4
979-981
EN
The influence of boron contents on the glass forming abilities and magnetic properties of melt-spun ribbon samples produced from Pr₉Fe_{50+x}Co₁₃Zr₁Nb₄B_{23-x} (x=0, 2, 5, 8) alloys, were investigated. For all compositions, the rapidly solidified samples were fully amorphous, which was confirmed by X-ray diffractometry and the Mössbauer spectroscopy. Differential scanning calorimetry and differential thermal analysis studies revealed good glass forming abilities for all investigated specimens and allowed to determine thermal stability parameters of the amorphous phase. For all alloy ribbons, very large supercooled liquid region before crystallization ΔT_x reaching 100 K was measured. The Kissinger plots were constructed to determine the activation energies for crystallization. Annealing of specimens at temperatures ranging from 923 K to 1033 K for 5 min resulted in significant change of the phase constitution. The X-ray diffractometry studies have shown presence of hard magnetic Pr₂(Fe,Co)₁₄B and paramagnetic Pr_{1+x}Fe₄B₄ phases. Furthermore, with the increase of B contents in the alloy composition crystallization of α-Fe phase occurs at wider range of the annealing temperature. Anomaly of both thermal and magnetic properties was observed for the Pr₉Fe₅₂Co₁₃Zr₁Nb₄B₂₁ alloy ribbons.
5
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Magnetization Reversal Processes in the Nanocrystalline Fe-Co-Zr-Ti-Pr-B Magnets

81%
Pawlik K., Pawlik P., Wysłocki J., Kaszuwara W.
Acta Physica Polonica A
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2008
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vol. 113
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issue 1
39-42
EN
Magnetization reversal processes in the magnets derived from the Fe_{60}Co_{13}Zr_1Ti_3Pr_9B_{14} alloy were investigated. It was shown that the processing technique affects the magnetization reversal processes. For the nanocrystalline ribbon samples pinning of the domain walls arises at low external magnetic fields while nucleation of reversed domains occurs at higher fields. However, the nucleation fields are lower than the pinning fields for the nanocrystalline rod and tube samples produced by suction-casting technique.
6
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Consolidation of Nanocrystalline Nd-Fe-B Powder by Hydrostatic Extrusion at High Temperature

81%
Gizynski T., Kaszuwara W., Kulczyk M., Leonowicz M.
Acta Physica Polonica A
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2017
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vol. 131
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issue 5
1260-1263
EN
Hydrostatic extrusion is a modern method of shaping material microstructure and properties. Hydrostatic extrusion can also be successfully used for consolidation of hard magnetic powders. The effect of extrusion temperature, within the range of 700-800°C, on the magnetic properties of the bulk, final product was studied. A commercial MQU-F42 powder, dedicated to hot pressing, was placed in copper capsules and initially cold compacted up to 60% of the theoretical density. Subsequently, the billet was heated in an oven to temperatures 700 and 800°C, respectively and subjected to hydrostatic extrusion. The extruded product had a form of a copper rod, with the Nd-Fe-B core, having 96% of theoretical density (true strain 1.85 after extrusion at 800°C). The extrusion process led to deterioration of the coercivity, for which coarsening of the Nd₂Fe₁₄B grains was blamed. In order to prove this hypothesis, the starting powder was annealed in a temperature range of 550-900°C for various times. The crystallite size, measured after annealing by the X-ray diffraction method, showed that with extension of time and elevation of the temperature the crystallite size increases, however the dominating parameter is the temperature. Correlation of the crystallite size with temperature indicates that when the crystallites are larger than 80 nm the magnetic properties dramatically decrease. Additionally, after HE at 800°C micrometric size Nd-rich phase appear in the microstructure. The Nd is squeezed from the grain boundary of the Nd₂Fe₁₄B phase leading to non-isolated grains, which also contributes to the deterioration of the coercivity.
7
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Characterization of Selected Parameters of Organic-Inorganic Hybrid Membranes Based on Various Polymers and Nd-Fe-B Fillers

81%
Rybak A., Kaszuwara W., Rybak A.
Archives of Metallurgy and Materials
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2016
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issue 4
8
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High-coercivity Nd-Fe-B Powders Obtained by High-Temperature Milling

81%
Kaszuwara W., Michalski B., Orlowski P.
Archives of Metallurgy and Materials
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2014
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issue 1
9
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Effect of the Powder Consolidation Method Type on the Microstructure and Selected Properties of Al2O3-Cu-Ni Composites

72%
Zygmuntowicz J., Wachowski M., Piotrkiewicz P., Kaszuwara W., Zygmuntowicz J., Wachowski M., Piotrkiewicz P., Kaszuwara W.
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10
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The possibility of producing graded Al2O3-Mo, Al2O3-Cu, Al2O3-W composites using CSC method

71%
Wachowski M., Kaszuwara W., Miazga A., Konopka K., Zygmuntowicz J.
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2019
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issue 2
11
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Microstructure and Properties of Magnets Obtained by Hydrostatic Extrusion of Nd-Fe-B Powder

62%
Gizynski T., Kaszuwara W., Pawlik P., Kulczyk M., Leonowicz M., Michalski B.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
626-628
EN
Nd-Fe-B MQ powder was initially densified in a copper capsule to reach about 60% of the theoretical density. Subsequently, three various processes of hydrostatic extrusion were conducted at room temperature. The values of true strain, obtained during the all three stages, were 1.38, 0.89, 0.94, respectively. The investigation performed showed that the coercivity of the material decreases as the strain increases. Decrease of the remanence was observed only for the highest strains. Size of the particles was strongly reduced during the extrusion processes. X-ray diffraction did not show changes in the phase structure of the material. The Mössbauer study, of the sample extruded within all the three stages, showed existence of the Nd₂Fe₁₄B phase and 16% of other phase. Analysis of magnetization versus temperature confirmed that the additional phase was ferromagnetic.
12
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The Effect of Annealing Temperature on the Phase Constitution and Magnetic Properties of the Pr₈Dy₁Fe₆₀Co₇Mn₆B₁₄Zr₁Ti₃ Alloy Ribbons

62%
Przybył A., Pawlik K., Pawlik P., Gębara P., Kaszuwara W., Wysłocki J., Filipecka K.
Acta Physica Polonica A
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2015
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vol. 128
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issue 1
94-97
EN
Melt-spun ribbons were produced from the Pr₈Dy₁Fe₆₀Co₇Mn₆B₁₄Zr₁Ti₃ base alloy at the surface velocity of the cooper wheel of 30 m/s. The studies showed amorphous structure of ribbons and their soft magnetic properties. X-ray diffraction was used to determine phase constitution of all obtained samples. Annealing of ribbons caused formation of nanocomposite structure, which was a result of coexistence of hard magnetic RE₂(Fe,Co)₁₄B and soft magnetic α-Fe phases. Basic magnetic properties such as: coercivity _{J}H_{c}, remanence J_{r} and maximum energy product (BH)_{max} were determined from the measured hysteresis loops. The microstructure of selected specimens was observed by transmission electron microscopy technique.
13
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Manufacturing of ZrO2-Ni graded composites via centrifugal casting in the magnetic field

58%
Wachowski M., Kosturek R., Winkler H., Miazga A., Lada P., Kaszuwara W., Konopka K., Zygmuntowicz J., Wachowski M., Kosturek R., Winkler H., Miazga A., Lada P., Kaszuwara W., Konopka K., Zygmuntowicz J.
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2020
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issue 3
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