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Low radiative heat transfer realized by 8YSZ/LaAl.sub.11O.sub.18 composites for high-temperature applications

Journal of materials science, 2022-10, Vol.57 (40), p.18754 [Peer Reviewed Journal]

COPYRIGHT 2022 Springer ;ISSN: 0022-2461 ;EISSN: 1573-4803 ;DOI: 10.1007/s10853-022-07840-2

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  • Title:
    Low radiative heat transfer realized by 8YSZ/LaAl.sub.11O.sub.18 composites for high-temperature applications
  • Author: Aziz, Hafiz Sartaj ; Wan, Chunlei ; Xing, Yan ; Sajid, Muhammad ; Shahid, Muhammad ; Pan, Wei
  • Subjects: Mechanical properties ; Sintering
  • Is Part Of: Journal of materials science, 2022-10, Vol.57 (40), p.18754
  • Description: Lower thermal conductivity and improved mechanical properties at high temperatures have always been the principal focus of designing thermal barrier coating materials (TBCs). In the present study, layer-structured LaAl.sub.11O.sub.18 was introduced into 8 wt% yttria-stabilized zirconia (8YSZ) to further improve the thermal and mechanical properties of 8YSZ. Thus, a series of 8YSZ/LaAl.sub.11O.sub.18 composites were prepared by solid sintering at 1600 °C. The composition and microstructure analyses indicate excellent chemical compatibility between 8YSZ and LaAl.sub.11O.sub.18 at high temperatures. The composites demonstrate by ~ 61% reduction of total thermal conductivity at 1200 °C as compared to a single 8YSZ. The radiative heat transfer of composites decreases around ~ 96.3% due to substantial photon scattering, resulting from lower photon mean free paths. Meanwhile, relatively good fracture toughness and lower elastic modulus (about ~ 13.3%) are promising design features of the composites for engineering applications, such as TBCs.
  • Publisher: Springer
  • Language: English
  • Identifier: ISSN: 0022-2461
    EISSN: 1573-4803
    DOI: 10.1007/s10853-022-07840-2
  • Source: ProQuest Central

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