研究目的
To demonstrate the processability of commercial Nd–Fe–B powder at a LPBF machine, which represents the industrial standard. The complex interplay between LPBF process parameter and resulting magnetic properties is analyzed and a first phenomenological model is developed to show the influence of LPBF on coercivity of Nd–Fe–B magnets.
研究成果
LPBF was successfully used to produce Nd–Fe–B permanent magnets with outstanding magnetic performance, representing a new benchmark for additive manufacturing of permanent magnets. A phenomenological model was developed to describe the influence of LPBF parameters on coercivity. The study opens new opportunities for resource-efficient production of permanent magnets with different magnetic properties in one sample directly during magnet shaping.
研究不足
The processability of Nd–Fe–B by LPBF is limited by the material's brittleness and the maximum energy input before delamination occurs. The study also notes that the particle size distribution of the initial powder was not ideal for LPBF, requiring sieving.
1：Experimental Design and Method Selection:
The study used laser powder bed fusion (LPBF) to produce Nd–Fe–B magnets, focusing on developing a suitable process window for fabricating isotropic samples with outstanding magnetic performance.
2：Sample Selection and Data Sources:
Commercial Nd–Fe–B powder (MQP-S, Magnequench) with spherical morphology was used, sieved to < 40 μm for LPBF.
3：List of Experimental Equipment and Materials:
A commercial M2 LPBF machine from ConceptLaser equipped with a 400 W diode pumped fiber laser was used. Magnetic properties were measured using a Permeagraph (Magnetphysik GmbH).
4：Experimental Procedures and Operational Workflow:
Cylindrical samples were produced with varying laser power, scan velocity, and hatch spacing. Samples were optically inspected, removed from the substrate, and their magnetic properties measured.
5：Data Analysis Methods:
The influence of LPBF parameters on magnetic properties was analyzed, and a phenomenological model was developed to describe the impact on coercivity.
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