Improved Toughness and Thermal Expansion of Non-stoichiometry Gd2 - xZr2 + xO7 + x/2 Ceramics for Thermal Barrier Coating Application

doi:10.1016/j.jmst.2015.11.022

Abstract

Abstract: Gd₂Zr₂O₇ has been considered as a promising thermal barrier coating candidate, but its toughness and thermal expansion coefficient (TEC) need to be improved. In this study, Gd_{2 -}_xZr_{2 +}_xO_{7 +}_x_/2 (x = 0, 0.1, 0.3, 0.5, 0.7) compounds were produced to improve the toughness and enlarge the TEC. Gd₂Zr₂O₇ and Gd_1.9Zr_2.1O_7.05 exhibited pyrochlore structure, while Gd_{2 -}_xZr_{2 +}_xO_{7 +}_x_/2 (x = 0.3, 0.5, 0.7) consisted of pyrochlore and t'-ZrO₂phases. With increasing ZrO₂ content, the pyrochlore in the compounds had decreased lattice parameter, and its ordering degree decreased when x ≤ 0.3, then it almost kept unchanged with higher ZrO₂ content. Among the Gd_{2 - x}Zr_{2 + x}O_{7 + x/2} ceramics investigated, the toughness of the compounds increased with increasing ZrO₂ content, while Gd_1.7Zr_2.3O_7.15 exhibited the largest TEC. The related mechanisms were discussed in detail.

Key words: Thermal barrier coating, Ceramic, Phase structure, Toughness, Thermal expansion coefficient

Lei Guo, Mingzhu Li, Yu Zhang, Fuxing Ye. Improved Toughness and Thermal Expansion of Non-stoichiometry Gd_{2 -}_xZr_{2 +}_xO_{7 +}_x_/2 Ceramics for Thermal Barrier Coating Application[J]. J. Mater. Sci. Technol., 2016, 32(1): 28-33.

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Improved Toughness and Thermal Expansion of Non-stoichiometry Gd_{2 -}_xZr_{2 +}_xO_{7 +}_x_/2 Ceramics for Thermal Barrier Coating Application

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