HDDR treatment of Ce-substituted Nd2Fe14B-based permanent magnet alloys - phase structure evolution, intergranular processes and magnetic property development

Nd2Fe14B permanent magnets substituted with non-critical light rare earth elements (Ce, La): A review

“…For partially substituted alloys (Nd1-x Cex)-Fe-B, Poenaru et al [68] characterized the microstructure of strip-cast ribbons for 0 < x < 0.6. They found that the CeFe2 compound appears for x = 0.3 and is located between the T1 lamellas.…”

Effects of Misalignment of c-axis on the Properties of Hydrogenation–Disproportionation–Desorption–Recombination Particles

“…Devices made of permanent magnet materials are being developed with enhanced magnetic properties, reduced weight, smaller size, and higher temperature tolerance, serving as the cornerstone for progress in clean energy technology [ 4 , 5 ]. Nd 2 Fe 14 B magnetic powder, known for its excellent room temperature magnetic properties, is widely used in environmentally friendly household appliances [ 6 , 7 ]. However, as devices continue to integrate and miniaturize, the inconsistent magnetic characteristics of Nd 2 Fe 14 B powder are becoming evident as devices shrink, impeding their application in compact, micro, and irregular structures [ 2 , 8 ].…”

Upscaling the 2‐Powder Method for the Manufacturing of Heavy Rare‐Earth‐Lean Sintered didymium‐Based Magnets

“…The physical metallurgy and phase diagram characteristics of the La and Ce substituted compounds are well comparable. [13][14][15][16][17][18] Putting aside the need for primary RE supply diversification in the context here, the reduction of resource criticality can be also addressed by developing magnet recycling strategies, on the one hand [19][20][21][22][23][24] and efficient HRE reduction by grain boundary engineering of Nd/Pr─Fe─B magnets, on the other hand. [25][26][27][28] Usually, the grain boundary diffusion process (GBDP) is used, which is a method originally introduced by Park et al [29] In this approach, the HREs are deposited on the surface of sintered magnets by either coating with metal foils, [30] HRE-oxides or -fluorides, [25,31] or low melting eutectic alloys such as DyNiAl [32] followed by a heat treatment at about 800-900 C [25,32,33] for several hours to infiltrate the magnet with the HREs through the grain boundaries (GB).…”

“…The physical metallurgy and phase diagram characteristics of the La and Ce substituted compounds are well comparable. [ 13–18 ]…”