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Super-strong materials for temperatures exceeding 2000 °C

Scientific reports, 2017-01, Vol.7 (1), p.40730-40730, Article 40730 [Peer Reviewed Journal]

Copyright Nature Publishing Group Jan 2017 ;Copyright © 2017, The Author(s) 2017 The Author(s) ;ISSN: 2045-2322 ;EISSN: 2045-2322 ;DOI: 10.1038/srep40730 ;PMID: 28102327

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  • Title:
    Super-strong materials for temperatures exceeding 2000 °C
  • Author: Silvestroni, Laura ; Kleebe, Hans-Joachim ; Fahrenholtz, William G ; Watts, Jeremy
  • Subjects: Ceramics ; Grain size ; High temperature ; Hot pressing ; Melting ; Nanoparticles ; Nose ; Oxidation ; Solid solutions ; Temperature effects
  • Is Part Of: Scientific reports, 2017-01, Vol.7 (1), p.40730-40730, Article 40730
  • Description: 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 (ZrB ) 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 ZrB 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.
  • Publisher: England: Nature Publishing Group
  • Language: English
  • Identifier: ISSN: 2045-2322
    EISSN: 2045-2322
    DOI: 10.1038/srep40730
    PMID: 28102327
  • Source: PubMed Central
    ProQuest Central
    DOAJ Directory of Open Access Journals
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