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Super-strong materials for temperatures exceeding 2000 °C

Silvestroni, Laura ; Kleebe, Hans‐Joachim ; Fahrenholtz, William G. ; Watts, Jeremy (2022):
Super-strong materials for temperatures exceeding 2000 °C. (Publisher's Version)
In: Scientific Reports, 7, Springer Nature, e-ISSN 2045-2322,
DOI: 10.26083/tuprints-00020492,
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Item Type: Article
Origin: Secondary publication service
Status: Publisher's Version
Title: Super-strong materials for temperatures exceeding 2000 °C
Language: English
Abstract:

Ceramics based on group IV-V transition metal borides and carbides possess melting points above 3000 °C, are ablation resistant and are, therefore, candidates for the design of components of next generation space vehicles, rocket nozzle inserts, and nose cones or leading edges for hypersonic aerospace vehicles. As such, they will have to bear high thermo-mechanical loads, which makes strength at high temperature of great importance. While testing of these materials above 2000 °C is necessary to prove their capabilities at anticipated operating temperatures, literature reports are quite limited. Reported strength values for zirconium diboride (ZrB₂) ceramics can exceed 1 GPa at room temperature, but these values rapidly decrease, with all previously reported strengths being less than 340 MPa at 1500 °C or above. Here, we show how the strength of ZrB₂ ceramics can be increased to more than 800 MPa at temperatures in the range of 1500–2100 °C. These exceptional strengths are due to a core-shell microstructure, which leads to in-situ toughening and sub-grain refinement at elevated temperatures. Our findings promise to open a new avenue to designing materials that are super-strong at ultra-high temperatures.

Journal or Publication Title: Scientific Reports
Volume of the journal: 7
Publisher: Springer Nature
Collation: 8 Seiten
Classification DDC: 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften
600 Technik, Medizin, angewandte Wissenschaften > 600 Technik
Divisions: 11 Department of Materials and Earth Sciences > Earth Science > Geo-Material-Science
Date Deposited: 16 Feb 2022 13:29
Last Modified: 16 Feb 2022 13:30
DOI: 10.26083/tuprints-00020492
Corresponding Links:
URN: urn:nbn:de:tuda-tuprints-204926
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/20492
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