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The effect of ZrO 2 alloying on the microstructures and thermal properties of DyTaO 4 for high‐temperature application
Author(s) -
Wu Peng,
Hu Mingyu,
Chen Lin,
Wu Fushuo,
Chong Xiaoyu,
Feng Jing
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16118
Subject(s) - materials science , monoclinic crystal system , yttria stabilized zirconia , microstructure , tetragonal crystal system , cubic zirconia , ceramic , phase (matter) , thermal expansion , fracture toughness , thermal barrier coating , thermal conductivity , crystallography , mineralogy , composite material , crystal structure , chemistry , organic chemistry
High fracture toughness of 8 YSZ (8 wt% yttria‐stabilized zirconia) is linked to its ferroelastic toughening mechanism. In this work, the similar ferroelastic domain is detected in monoclinic Dy 1− x Ta 1− x Zr 2 x O 4 ceramics, which derives from the ferroelastic transformation between the high‐temperature tetragonal (t) and low‐temperature monoclinic (m) phase. The lowest thermal conductivity of Dy 1− x Ta 1− x Zr 2 x O 4 ceramics is reduced by 30% compared with 8 YSZ, and the largest thermal expansion coefficients (TECs) is up to 11 × 10 −6 K −1 at 1200°C, which is comparable to that of 8 YSZ. Notably, the systematic investigations containing phase, microstructure, thermophysical properties of Dy 1− x Ta 1− x Zr 2 x O 4 ceramics will provide guidance for its high‐temperature application, especially as thermal barrier coatings.