Ink casting and 3D-extrusion printing of the thermoelectric half-Heusler alloy Nb1-xCoSb
Additive manufacturing of lattices with ∼600 μm diameter struts is achieved via extrusion printing of an ink containing prealloyed powder of the half-Heusler alloy Nb1-xCoSb, followed by debinding and vacuum sintering to a relative density of ∼70–80%. The ink can also be poured and cast into square...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2023-02-01
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| Series: | Additive Manufacturing Letters |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2772369022000809 |
| _version_ | 1797959620753358848 |
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| author | Muath M. Al Malki G. Jeffrey Snyder David C. Dunand |
| author_facet | Muath M. Al Malki G. Jeffrey Snyder David C. Dunand |
| author_sort | Muath M. Al Malki |
| collection | DOAJ |
| description | Additive manufacturing of lattices with ∼600 μm diameter struts is achieved via extrusion printing of an ink containing prealloyed powder of the half-Heusler alloy Nb1-xCoSb, followed by debinding and vacuum sintering to a relative density of ∼70–80%. The ink can also be poured and cast into square blocks, which, after debinding and sintering, achieve a similar relative density. Sintering in a Sb-rich atmosphere reduces Sb sublimation and decomposition of the half-Heusler phase. This is reflected in electrical conductivity values, for ink-cast specimens, similar to those of a sample created by vacuum hot-pressing of dry powders (1080 S/cm at 298 K). However, a lower Seebeck coefficient for the ink-cast specimens (92 vs. 150 µV/K for a hot-pressed sample) leads to a reduced figure of merit (zTmax = 0.10±0.015 vs. 0.26±0.04 at 873 K for a hot-pressed sample), where secondary phases, NbSb2 and CoSb3 were observed; these might be minimized, or even eliminated, via further optimization of the sintering conditions. |
| first_indexed | 2024-04-11T00:34:15Z |
| format | Article |
| id | doaj.art-db0a7c8c17f54f5486fa7766ef63fed4 |
| institution | Directory Open Access Journal |
| issn | 2772-3690 |
| language | English |
| last_indexed | 2024-04-11T00:34:15Z |
| publishDate | 2023-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Additive Manufacturing Letters |
| spelling | doaj.art-db0a7c8c17f54f5486fa7766ef63fed42023-01-07T04:17:40ZengElsevierAdditive Manufacturing Letters2772-36902023-02-014100113Ink casting and 3D-extrusion printing of the thermoelectric half-Heusler alloy Nb1-xCoSbMuath M. Al Malki0G. Jeffrey Snyder1David C. Dunand2Department of Materials Science & Engineering, Northwestern University, Evanston, IL 60208, United States; Mechanical Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia; Corresponding author at: Department of Materials Science & Engineering, Northwestern University, Evanston, IL 60208, United States.Department of Materials Science & Engineering, Northwestern University, Evanston, IL 60208, United StatesDepartment of Materials Science & Engineering, Northwestern University, Evanston, IL 60208, United StatesAdditive manufacturing of lattices with ∼600 μm diameter struts is achieved via extrusion printing of an ink containing prealloyed powder of the half-Heusler alloy Nb1-xCoSb, followed by debinding and vacuum sintering to a relative density of ∼70–80%. The ink can also be poured and cast into square blocks, which, after debinding and sintering, achieve a similar relative density. Sintering in a Sb-rich atmosphere reduces Sb sublimation and decomposition of the half-Heusler phase. This is reflected in electrical conductivity values, for ink-cast specimens, similar to those of a sample created by vacuum hot-pressing of dry powders (1080 S/cm at 298 K). However, a lower Seebeck coefficient for the ink-cast specimens (92 vs. 150 µV/K for a hot-pressed sample) leads to a reduced figure of merit (zTmax = 0.10±0.015 vs. 0.26±0.04 at 873 K for a hot-pressed sample), where secondary phases, NbSb2 and CoSb3 were observed; these might be minimized, or even eliminated, via further optimization of the sintering conditions.http://www.sciencedirect.com/science/article/pii/S2772369022000809Thermoelectrichalf-Heusler3D printingNbCoSb |
| spellingShingle | Muath M. Al Malki G. Jeffrey Snyder David C. Dunand Ink casting and 3D-extrusion printing of the thermoelectric half-Heusler alloy Nb1-xCoSb Additive Manufacturing Letters Thermoelectric half-Heusler 3D printing NbCoSb |
| title | Ink casting and 3D-extrusion printing of the thermoelectric half-Heusler alloy Nb1-xCoSb |
| title_full | Ink casting and 3D-extrusion printing of the thermoelectric half-Heusler alloy Nb1-xCoSb |
| title_fullStr | Ink casting and 3D-extrusion printing of the thermoelectric half-Heusler alloy Nb1-xCoSb |
| title_full_unstemmed | Ink casting and 3D-extrusion printing of the thermoelectric half-Heusler alloy Nb1-xCoSb |
| title_short | Ink casting and 3D-extrusion printing of the thermoelectric half-Heusler alloy Nb1-xCoSb |
| title_sort | ink casting and 3d extrusion printing of the thermoelectric half heusler alloy nb1 xcosb |
| topic | Thermoelectric half-Heusler 3D printing NbCoSb |
| url | http://www.sciencedirect.com/science/article/pii/S2772369022000809 |
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