期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2015.09.081
关键词
Thermal barrier coating; Gd2Zr2O7; Doping; Phase stability; Fracture toughness
类别
资金
- National Natural Science Foundation of China, China [51501127, 51375332]
- Specialized Research Fund for the Doctoral Program of Higher Education [20120032110031]
Gd2Zr2O7 has been considered as a promising thermal barrier coating candidate for operating above 1300 C, but the relatively poor fracture toughness limits its application. In this study, effort was made to toughen Gd2Zr2O7 with the addition of metastable tetragonal (t') phase. For 3.5 mol% RE2O3 (RE=Dy, Y, Er, Yb) stabilized ZrO2 (RESZ) ceramics, the t' phase stability increased with the decrease of RE3+ ionic radius. Among these compounds, YbSZ exhibited the best phase stability and had excellent toughness, thus it was selected as the toughening agent for Gd2Zr2O7. The phase structure and mechanical properties of YbSZ doped Gd2Zr2O2 were investigated. YbSZ first dissolved in Gd2Zr2O7 lattice, then it presented as a second phase when its content reached to 15 mol%. With YbSZ content increasing, the fracture toughness of the compounds increased, and the related mechanisms were discussed. (C) 2015 Elsevier B.V. All rights reserved,
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