Advanced Magnetocaloric Materials

Moreno-Ramírez, Luis M.; Law, Jia Yan; Díaz-García, Álvaro; Franco, V.

doi:10.1016/b978-0-12-819728-8.00068-1

Cited by 2 publications

(2 citation statements)

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“…Despite high hopes for this field, further research is essential, as there are still no materials that realistically balance performance and cost. 4,5 Currently, materials undergoing first-order phase transitions (FOPT) attract the most attention as these can exhibit a giant MCE performance without depending on critical elements. The family of NiMn-based Heusler alloys is one of the most relevant representatives of this group due to the occurrence of a magnetostructural transformation (typically referred to as martensitic transformation) which consists of a solid-to-solid transition from a martensitic-type structure to an austenitic one upon heating, which has a significant MCE associated to it as well as magnetic shape memory effect.…”

Section: Introductionmentioning

confidence: 99%

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Polymer‐based filaments with embedded magnetocaloric Ni‐Mn‐Ga Heusler alloy particles for additive manufacturing

Díaz‐García,

Law,

Żrodowski

et al. 2024

Polymer Composites

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One important issue associated to magnetocaloric materials that hinders its technological application is the poor processability and structural integrity of those with the highest performance, usually intermetallics undergoing first‐order magnetic phase transitions. Additionally, the performance of these magnetocaloric materials highly depends on the structural stability of the magnetocaloric phase, which is, in many cases, very sensitive to temperature and mechanical processes. Additive manufacturing via the extrusion of polymer‐based composites is regarded as a promising way to overcome these issues. A recently presented manufacturing method of encapsulating functional fillers into polymer capsules has been used to produce a composite filament with a large load of magnetocaloric off‐stoichiometric Ni2MnGa Heusler alloy fillers with a uniform distribution throughout the polymer matrix as demonstrated by x‐ray tomography characterization. The incorporation of these metallic particles causes changes in the thermal behavior of the polymer as well as an increase in the flowability of the composite with respect to the polymer at the same temperature. The increased flowability of the composites found during manufacturing can be compensated by lowering the extrusion temperatures, making this technique even more convenient for preserving the filler properties, which is an important concern when additive manufacturing magnetocaloric materials. This is confirmed by the magnetic and magnetocaloric behavior of the composites, with responses proportional to the fraction of fillers.Highlights Ultrasonic‐atomization produces highly spherical Ni‐Mn‐Ga Heusler alloy particles. Ni‐Mn‐Ga filled polymer capsules allow a direct extrusion of composites for AM. X‐ray tomography shows uniform volumetric filler distribution within the filaments. Decreased viscosity of the matrix favors the lowering of the processing temperature. The low processing temperatures avoid altering the MCE of the alloy fillers.

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Section: Introductionmentioning

confidence: 99%

“…Despite high hopes for this field, further research is essential, as there are still no materials that realistically balance performance and cost 4,5 . Currently, materials undergoing first‐order phase transitions (FOPT) attract the most attention as these can exhibit a giant MCE performance without depending on critical elements.…”

Section: Introductionmentioning

confidence: 99%