Room-temperature polymer-assisted additive manufacturing of microchanneled magnetocaloric structures

Sharma, Vaibhav; Balderson, Lilly; Heo, Rachel; Bishop, Omar; Hunt, Caitlin S.M.; Carpenter, Everett E.; Hadimani, Ravi L.; Zhao, Hong; Barua, Radhika

doi:10.1016/j.jallcom.2022.165891

Cited by 11 publications

(12 citation statements)

References 43 publications

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“…PEO was dissolved in DCM with a 66.7 mg mL −1 concentration and retained for 24 h to ensure a uniform solution. The dynamic viscosity of the three ink formulations was characterized on a high precision rheometer (Anton Paar MCR301), and consistent with results presented in [11], the inks prepared in this study demonstrated optimal shear thinning and ink stability characteristics. The printing conditions kept in the range: printing speed = (1.6-2 mm s −1 ), pressure = (0.…”

Section: D Printing Process and Post-processing Heat Treatmentsupporting

confidence: 85%

“…In this section, the structural and magnetic attributes of feedstock La 0.67 Ca 0.33 MnO 3 magnetocaloric powders prepared via the modified Pechini sol-gel method [14] is presented first; the microstructural features and magnetocaloric properties of test coupons La 0.67 Ca 0.33 MnO 3 3D-printed via a direct ink writing scheme developed in [11] is discussed thereafter.…”

Section: Resultsmentioning

confidence: 99%

“…Following guidelines obtained from [11], La 0.67 Ca 0.33 MnO 3 -based inks consisting of ∼80 wt% magnetocaloric powder and 20 wt% PEO were prepared. For every 1g of magnetic powder, 0.091 g EGBE, 0.006 g DBP, and 0.107 g DCM was added and mixed by a planetary centrifugal mixer (Thinky USA) for 1 min at 2000 RPM to form a particle slurry.…”

Section: D Printing Process and Post-processing Heat Treatmentmentioning

confidence: 99%

“…In addition to excellent magnetocaloric characteristics, the geometry of the AMR must be optimal such that it satisfies the following criteria: (i) low porosity to maximize the amount of working MCM material and reduce demagnetization effects during magnetic field cycling , (ii) a large surface-to-volume ratio to maximize the heat transfer area between the MCM and the heat exchange fluid, (iii) low surface roughness and uniform channel cross-section to minimize flow resistance that leads to pressure drop along the length of the AMR [10]. While most of the magnetic refrigerator prototypes to date still utilize MRs with very simple geometries, such as packed particle bed and epoxy-bonded parallel-plate structures [8], in recent years, several studies have been devoted to the fabrication of channeled magnetocaloric structures using AM processing schemes (see detailed list in table 1 of [11]). Among these AM methods, direct ink writing DIW (extrusion-based 3D printing) stands out due to its unique ability to extrude material at room temperature and applicability to various materials, including ceramics, polymers, metals, and composites [8].…”

Section: Introductionmentioning

confidence: 99%

“…Among these AM methods, direct ink writing DIW (extrusion-based 3D printing) stands out due to its unique ability to extrude material at room temperature and applicability to various materials, including ceramics, polymers, metals, and composites [8]. In previous work, we have demonstrated the proof-of-concept feasibility of 3D printing spatially designed microchannelled magnetocaloric heat exchanger structures with minimum dimensions of ∼150 μm using a nozzle of diameter ∼200 μm [11].…”

Section: Introductionmentioning

confidence: 99%

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Influence of powder feedstock characteristics on extrusion-based 3D printing of magnetocaloric structures

Sharma,

Goldsworthy,

Hadimani

et al. 2024

Mater. Res. Express

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A significant barrier to the commercialization of magnetic heat pumping is the lack of scalable, low-cost manufacturing techniques that enable shaping brittle magnetocaloric materials into heat exchange structures with porous geometries, controlled chemical gradients, and advantageous anisotropic microstructures. Though direct ink writing additive manufacturing has the potential to expand into a viable net-shaping technology for functional magnetic alloys, it is typically challenging to fabricate dense parts – an observation ascribed to the constraint on powder particle size that inevitably impacts both green density of 3D printed parts and shrinkage during sintering. To this end, we report a comprehensive study on the influence of precursor powder characteristics on the magnetic and structural properties of 3D printed test coupons produced using La0.67Ca0.33MnO3 magnetocaloric particles. Ink formulations comprising powders with nano-scaled, micron-scaled, and bimodal size distributions were printed and sintered. The impact of particle size on part quality and magnetofunctional response was examined, and it was found that test coupon fabricated using nano-scaled powders (~100-200 nm) demonstrated the lowest part porosity (~ 17%) and the highest magnetocaloric response (8 J/kg·K at μ0H=5T). The results presented in this work address critical technical questions about the process feasibility of making magnetic heat pumps with additive manufacturing schemes.

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Section: D Printing Process and Post-processing Heat Treatmentsupporting

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Section: D Printing Process and Post-processing Heat Treatmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Influence of powder feedstock characteristics on extrusion-based 3D printing of magnetocaloric structures

Sharma,

Goldsworthy,

Hadimani

et al. 2024

Mater. Res. Express

Self Cite

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Advanced Magnetocaloric Materials for Energy Conversion: Recent Progress, Opportunities, and Perspective

Zhang,

Miao,

van Dijk

et al. 2024

Advanced Energy Materials

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Solid‐state caloric effects as intrinsic thermal responses to different physical external stimuli (magnetic‐, uniaxial stress‐, pressure‐, and electric‐fields) can achieve a higher energy efficiency compared with traditional gas compression techniques. Among these effects, magnetocaloric energy conversion is regarded as the best available alternative and has been exploited extensively for promising application scenarios in the last decades. This review systematically introduces the magnetocaloric effect and its applications, and summarizes the corresponding representative magnetocaloric materials, as well as important progress in recent years. Specifically, the review focuses on some key understandings of the magnetocaloric effect by utilizing state‐of‐the‐art technical tools such as synchrotron X‐ray, neutron scattering, muon spin spectroscopy, positron annihilation spectroscopy, high magnetic fields, etc., and highlights their importance toward advanced materials design and development. An overview of the basic principles and applications of these advanced techniques on magnetocaloric materials is provided. Finally, the challenges and perspectives on further developments in this field are discussed. Further in‐depth understanding and manufacturing technology advancement combined with fast‐developed artificial intelligence and machine learning are expected to advance the magnetocaloric energy conversion technology closer to real applications.

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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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Room-temperature polymer-assisted additive manufacturing of microchanneled magnetocaloric structures

Cited by 11 publications

References 43 publications

Influence of powder feedstock characteristics on extrusion-based 3D printing of magnetocaloric structures

Influence of powder feedstock characteristics on extrusion-based 3D printing of magnetocaloric structures

Advanced Magnetocaloric Materials for Energy Conversion: Recent Progress, Opportunities, and Perspective

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

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