Abstract
The current work presents the results of an investigation focused on the influence of process parameters on the melt-track stability and its consequence to the sample density printed out of NdFeB powder. Commercially available powder of Nd7.5Pr0.7Fe75.4Co2.5B8.8Zr2.6Ti2.5 alloy was investigated at the angle of application in selective laser melting of permanent magnets. Using single track printing the stability of the melt pool was investigated under changing process parameters. The influence of changing laser power, scanning speed, and powder layer thickness on density, porosity structure, microstructure, phase composition, and magnetic properties were investigated. The results showed that energy density coupled with powder layer thickness plays a crucial role in melt-track stability. It was possible to manufacture magnets of both high relative density and high magnetic properties. Magnetization tests showed a significant correlation between the shape of the demagnetization curve and the layer height. While small layer heights are beneficial for sufficient magnetic properties, the remaining main parameters tend to affect the magnetic properties less. A quasi-linear correlation between the layer height and the magnetic properties remanence (Jr), coercivity (HcJ) and maximum energy product ((BH)max) was found.
Highlights
NdFeB permanent magnets attract great interest due to their extraordinary performance in comparison to other types of hard magnets
Overview of single tracks formed by parameters sets: I, II, III, and IV at various powder thickness (Lt)
It was found that the investigated material had a very narrow processing window and 20 W change in laser power may result in destabilization of a melt track
Summary
NdFeB permanent magnets attract great interest due to their extraordinary performance in comparison to other types of hard magnets. Their energy density (e.g., magnetic polarization Jr higher than 1 Tesla, coercivity HcJ above 1000 kA m−1 , and figure of merit (BH)max greater than 500 kJ·m−3 ). Outperforms other types of permanent magnets at room temperature Due to this characteristic, NdFeB magnets are considered as key components for clean energy application [1]. NdFeB magnets are considered as key components for clean energy application [1] They are classified as potentially the best candidates for the miniaturization of electric devices or highly efficient electric motors [2,3]. Applied techniques, such as sintering, extrusion, or spark plasma sintering (SPS), deliver magnets with excellent magnetic properties and of high relative density [4,5,6,7,8,9,10,11,12,13,14].
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