Hollow-grained “Voronoi foam” ceramics with high strength and thermal superinsulation up to 1400 °C
© 2021 Elsevier Ltd Nanostructures tend to be unstable at high temperatures due to large capillary energies, and therefore nanotechnology has not yet found many high-temperature applications at 1000 °C and above. By taking advantage of the high-temperature stability of refractory ceramics, here we d...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier BV
2021
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| Online Access: | https://hdl.handle.net/1721.1/135580 |
| _version_ | 1826208413667819520 |
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| author | Li, Sa Wang, Chang-An Yang, Fuqian An, Linan So, Kangpyo Li, Ju |
| author2 | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Li, Sa Wang, Chang-An Yang, Fuqian An, Linan So, Kangpyo Li, Ju |
| author_sort | Li, Sa |
| collection | MIT |
| description | © 2021 Elsevier Ltd Nanostructures tend to be unstable at high temperatures due to large capillary energies, and therefore nanotechnology has not yet found many high-temperature applications at 1000 °C and above. By taking advantage of the high-temperature stability of refractory ceramics, here we develop a new approach of making hollow nano-grained materials to achieve thermal superinsulation across a wide temperature range, where the gaseous voids are mostly isolated within individual grain, with size comparable to the mean free path of air molecules to lower the thermal conduction by Knudsen effect. We have proved this general concept with hollow-grained La2Zr2O7 ceramic, and demonstrated exceptionally low thermal conductivity (0.016 W/(m⋅K)), the lowest ever reported for hard materials at or above room temperature. The centimeter-scale samples also have ultrahigh compressive strength (251 MPa), tensile strength in bending up to 100 MPa, and excellent thermal stability up to 1400 °C in air, due to monodispersity of pores that delays coarsening. |
| first_indexed | 2024-09-23T14:05:21Z |
| format | Article |
| id | mit-1721.1/135580 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T14:05:21Z |
| publishDate | 2021 |
| publisher | Elsevier BV |
| record_format | dspace |
| spelling | mit-1721.1/1355802023-06-02T05:01:21Z Hollow-grained “Voronoi foam” ceramics with high strength and thermal superinsulation up to 1400 °C Li, Sa Wang, Chang-An Yang, Fuqian An, Linan So, Kangpyo Li, Ju Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Massachusetts Institute of Technology. Department of Materials Science and Engineering © 2021 Elsevier Ltd Nanostructures tend to be unstable at high temperatures due to large capillary energies, and therefore nanotechnology has not yet found many high-temperature applications at 1000 °C and above. By taking advantage of the high-temperature stability of refractory ceramics, here we develop a new approach of making hollow nano-grained materials to achieve thermal superinsulation across a wide temperature range, where the gaseous voids are mostly isolated within individual grain, with size comparable to the mean free path of air molecules to lower the thermal conduction by Knudsen effect. We have proved this general concept with hollow-grained La2Zr2O7 ceramic, and demonstrated exceptionally low thermal conductivity (0.016 W/(m⋅K)), the lowest ever reported for hard materials at or above room temperature. The centimeter-scale samples also have ultrahigh compressive strength (251 MPa), tensile strength in bending up to 100 MPa, and excellent thermal stability up to 1400 °C in air, due to monodispersity of pores that delays coarsening. 2021-10-27T20:24:07Z 2021-10-27T20:24:07Z 2021 2021-08-12T17:38:29Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/135580 en 10.1016/j.mattod.2021.02.003 Materials Today Creative Commons Attribution-NonCommercial-NoDerivs License http://creativecommons.org/licenses/by-nc-nd/4.0/ application/pdf Elsevier BV Other repository |
| spellingShingle | Li, Sa Wang, Chang-An Yang, Fuqian An, Linan So, Kangpyo Li, Ju Hollow-grained “Voronoi foam” ceramics with high strength and thermal superinsulation up to 1400 °C |
| title | Hollow-grained “Voronoi foam” ceramics with high strength and thermal superinsulation up to 1400 °C |
| title_full | Hollow-grained “Voronoi foam” ceramics with high strength and thermal superinsulation up to 1400 °C |
| title_fullStr | Hollow-grained “Voronoi foam” ceramics with high strength and thermal superinsulation up to 1400 °C |
| title_full_unstemmed | Hollow-grained “Voronoi foam” ceramics with high strength and thermal superinsulation up to 1400 °C |
| title_short | Hollow-grained “Voronoi foam” ceramics with high strength and thermal superinsulation up to 1400 °C |
| title_sort | hollow grained voronoi foam ceramics with high strength and thermal superinsulation up to 1400 °c |
| url | https://hdl.handle.net/1721.1/135580 |
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