Publication Date:
2019
Description:
Abstract
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 Dy1−xTa1−xZr2xO4 ceramics, which derives from the ferroelastic transformation between the high‐temperature tetragonal (t) and low‐temperature monoclinic (m) phase. The lowest thermal conductivity of Dy1−xTa1−xZr2xO4 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 Dy1−xTa1−xZr2xO4 ceramics will provide guidance for its high‐temperature application, especially as thermal barrier coatings.
Print ISSN:
0002-7820
Electronic ISSN:
1551-2916
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
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