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Additive Manufacturing of Magnetocaloric Materials: Assessing and Adapting DLD and BJ3DP Fabrication Methods

Stevens, Erica (2021) Additive Manufacturing of Magnetocaloric Materials: Assessing and Adapting DLD and BJ3DP Fabrication Methods. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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Abstract

Solid-state cooling by means of magnetocaloric heat pumps is a promising alternative to current cooling technologies which are inefficient and environmentally-harmful. One major barrier to realizing the full potential of magnetocaloric heat exchangers is effective fabrication methods that enable geometric freedom while maintaining beneficial microstructures and combating the challenges these typically-brittle materials pose during machining. An ideal fabrication method would result in a heat exchanger with optimized heat transfer properties, low pressure drop in the heat transfer fluid, gradient transformation temperature, and reasonable manufacturing cost. Additive manufacturing has the capacity to realize all of these aims. This investigation explores the direct laser deposition and binder jet 3D printing additive manufacturing methods to produce functional parts using materials with magnetocaloric properties. Both direct laser deposition and binder jet 3D printing, after a necessary post-processing step, were found capable of producing parts with favorable magnetocaloric properties. A powder bed binder jet 3D printer was designed and fabricated to produce multi-material layered parts, with a goal of gradient transformation temperatures within a single part. Layering materials with various transformation temperatures extends the working temperature range and increases magnetocaloric heat exchanger performance. The results presented in this dissertation answer key technical questions about manufacturing process feasibility for fabricating magnetocaloric heat pumps with additive methods. Finally, an outlook is presented, collecting and examining the knowledge gained to predict the direction and prospects for additive manufacturing of magnetocaloric heat pumps.


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Details

Item Type: University of Pittsburgh ETD
Status: Unpublished
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Stevens, Ericaericastevens@pitt.eduels1190000-0003-0031-2314
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairChmielus, Markuschmielus@pitt.edu0000-0002-8688-6054
Committee MemberWiezorek, Jörgwiezorek@pitt.edu0000-0002-1358-0556
Committee MemberNettleship, Iannettles@pitt.edu
Committee MemberDeGraef, Marcdegraef@cmu.edu0000-0002-4721-6226
Date: 26 January 2021
Date Type: Publication
Defense Date: 6 October 2020
Approval Date: 26 January 2021
Submission Date: 8 September 2020
Access Restriction: 1 year -- Restrict access to University of Pittsburgh for a period of 1 year.
Number of Pages: 171
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Materials Science and Engineering
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: Magnetocaloric, Additive Manufacturing, Direct laser deposition, Binder jet, 3D printing
Date Deposited: 26 Jan 2021 15:48
Last Modified: 26 Jan 2021 15:48
URI: http://d-scholarship.pitt.edu/id/eprint/39784

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