The development of Additive Manufacturing (AM) of polymer bonded Nd-Fe-B magnets has focused on increasing remanence (B_R) and maximum energy-product ((BH)_max) values. One possible approach is to increase the volumetric fraction of magnetic particles on the as-printed components. The present contribution strives to shed light on how the combination of feedstock characteristics and process parameters can be critical factors to achieve such a goal in the case of the so-called Powder Bed Fusion (PBF) technique. In the present investigation, two feedstocks composed of polyamide-12 and spherical Nd-Fe-B isotropic powder (MQP-S-9-8), with different volumetric fractions of polyamide-12 (36 and 45 vol.%), were processed into magnet samples under three different laser speed values (LS = 600, 1000 and 1400 mm/s). The maximum geometrical density obtained of ρ = 4.33 g/cm³ was achieved for feedstock with 45 vol.% of polyamide-12 processed with LS = 600 mm/s, which represents 96% of the theoretical density for this composition. This combination resulted in remanence and maximum energy-product values of B_R = 0.385 T and (BH)_max = 24.1 kJ/m³, respectively. From SEM analysis, this combination promoted the formation of a continuous polymeric matrix, absent in the other explored condition, indicating that 36 vol.% of polyamide-12 or less is insufficient to encourage an adequate consolidation.

聚合物粘结Nd-Fe-B磁体的增材制造（AM）的发展侧重于增加剩磁（B _R）和最大能量积（（BH）_max）值。一种可能的方法是增加印刷组件上磁性颗粒的体积分数。本发明致力于阐明在所谓的粉末床熔合（PBF）技术的情况下，原料特性和工艺参数的组合如何成为实现该目标的关键因素。在本研究中，加工了两种聚酰胺12和球形Nd-Fe-B各向同性粉末（MQP-S-9-8）组成的原料，其中聚酰胺12的体积分数不同（36和45％（体积））。在三种不同的激光速度值（LS = 600、1000和1400 mm / s）下进入磁体样品。获得的最大几何密度为ρ = 4.33 g / cm ³对于以LS ＝ 600mm / s处理的具有45vol。％的聚酰胺-12的原料而言，获得了最大粘度，其代表该组合物的理论密度的96％。这种结合导致剩磁和最大能量乘积值分别为B _R  = 0.385 T和（BH）_max = 24.1 kJ / m ³。从SEM分析，该组合促进了在其他探索条件下不存在的连续聚合物基质的形成，表明36vol。％或更少的聚酰胺-12不足以促进充分的固结。