[P1] Processing, Characterization & Thin Films

[P1-61] Phase composition and magnetic properties of Nd(Pr)₂Fe₁₄B and (Sm,Zr)Fe₁₁Ti magnets produced by selective laser melting

Sergey Andreev¹, *Viktoria Maltseva¹, Dmitriy Neznakhin¹, Arkadiy Shalaginov¹, Andrey Urzhumtsev¹, Alexey Volegov¹ (1. Ural Federal University (Russia))

Keywords:

Additive manufacturing,Selective laser melting,Permanent magnets,Phase composition,Microstructure

Hard magnetic materials are classified among functional materials, which, in many respects, are the basis of modern technological processes, day-to-day operation devices, electrical transport, etc. The rate of improvement of the magnetic hysteretic properties of permanent magnets has steadily decreased because in the industrial production, the potential of the Nd₂Fe₁₄Bcompound has been realized almost completely. To further improve the functional properties of articles with permanent magnets, new approaches to designing such articles should be used. The additive manufacturing of functional magnetic materials and articles based on them is among these approaches. Additive technologies have several significant advantages over subtractive (edge cutting machining) and forming (strain without moving off a material) technologies. One of the advantages consists in the possibility of preparing samples and articles of any form, which is limited by the mechanical properties of a material. The other advantage is the local tuning of the material properties at the preparation stage at the expense of varying both the chemical composition and micro-structural state.In the present study, the effect of synthesis parameters on the phase composition and magnetic hysteretic properties of single-layer Nd₂Fe₁₄B-based permanent magnets synthesized by selective laser sintering is investigated. The causes for the effect of synthesis parameters on the magnetic hysteretic properties are considered. The possibility of reaching a coercivity of single-layer magnets of 19.5 kOe, which are free of heavy rare-earth metals, will be demonstrated.Also, this work presents a proof-of-concept of additive manufacturing of (Sm,Zr)Fe₁₁Ti permanent magnet. A way to produce permanent magnets from (Sm,Zr)Fe₁₁Ti powder and its mixture with low-melting additive Sm₇₅(Cu, Co)₂₅ by the selective laser melting will be demonstrated. The phase transformations which accompany the liquid phase sintering of hard magnetic particles in low-melting Sm₇₅(Cu,Co)₂₅ additive will be discussed. The printing parameters which allow sintering of the hard magnetic alloy particles were found. When the main phase is (Sm,Zr) Fe₁₁Ti, the coercivity of H_c = 5 kOe is achieved.
This work was financially supported by FEUZ-2024-0066.