The effect of cobalt content on the microstructure of Pr–Fe–Co–B–Nb alloys and magnetic properties of HDDR magnets

Effect of boron content on magnetic properties and microstructure of PrFeCoBNb HDDR permanent magnets

“…Two other phases (white and grey) were also found in the alloys containing 16 at% Co (see Fig. 5 for phase identification) and were identified previously [11,12] as Pr 3 Co and Pr(Fe,Co) 2 (Laves phase).…”

“…All the alloys contain about 0.1 wt% aluminium as an impurity (as per the supplier's specification). Details about the preparation of the HDDR magnets, alloy homogenisation heat treatment and magnetic measurements have been described in previous papers [1][2][3][4][5][6][7]11,12]. Permeameter measurements were carried out after saturation in a pulsed field of 6.0 T. Remanence values were normalized assuming 100% density for the HDDR sample, and by also considering a linear relationship between density and remanence.…”

“…Recently, it was shown that the amount of cobalt (Pr 14 Fe 79.9Àx Co x B 6 Nb 0.1 ) has a significant influence on the microstructure of magnetic alloys and on the properties of HDDR magnets [11]. More recently, it was shown that the praseodymium content (Pr x Fe 77.9Àx Co 16 B 6 Nb 0.1 ) also has a great influence in Pr-based alloys and HDDR materials [12].…”

Effects of the conventional HDDR process and the additions of Co and Zr on anisotropy of HDDR Pr–Fe–B-type magnetic materials

“…It has been shown that Co and Zr addition is helpful for preparing anisotropic Pr-Fe-B magnetic materials [4][5][6][7][8], but the study on the detailed relationship between the additions and the DOA of HDDR Pr 13 Fe 80 B 7 magnetic materials is very limited. Fig.…”

“…Pr 2 Fe 14 B-type alloys are comparable in terms of their intrinsic magnetic properties and phase relations with the advantages of a much lower spin-reorientation temperature [2], so the HDDR process is tried in the preparation of anisotropic Pr 2 Fe 14 B-type magnetic powders. It has been shown that both anisotropic ternary Pr-Fe-B and Pr-Fe-B-type powders with alloying additions can be prepared by the appropriate solid-HDDR process [3][4][5][6][7][8][9]. However, the origin of anisotropy is unclear till now.…”