期刊
CERAMICS INTERNATIONAL
卷 43, 期 12, 页码 9041-9046出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2017.04.048
关键词
Thermal barrier coating; (Gd0.9Sc0.1)(2)Zr2O7; V2O5; Hot corrosion
资金
- National Natural Science Foundation of China [51501127, 51375332]
- Natural Science Foundation of Tianjin [16JCQNJC02900, 16JCYBJC18700]
Hot corrosion behavior of (Gd0.9Sc0.1)(2)Zr2O7 ceramic exposed to V2O5 molten salt at 700-1000 degrees C was investigated, providing better understanding of its corrosion resistance as a promising thermal barrier coating. Obvious corrosion reaction occurred between (Gd0.9Sc0.1)(2)Zr2O7 and V2O5 molten salt after 4 h heat treatment, corrosion products being temperature dependent. At 700 degrees C, large amount of Sc2O3 doped ZrV2O7 and GdVO4, together with a minor amount of Sc2O3-stabilized tetragonal ZrO2 (t-ZrO2), formed on the sample surfaces. With the increase of the test temperature, Sc2O3 doped ZrV2O7 turned to decompose, leading to the formation of more t-ZrO2. At 900 degrees C and 1000 degrees C, the corrosion products were composed of GdVO4 and t-ZrO2. The mechanism by which the corrosion reaction occurs is proposed based on phase diagrams and Lewis acid-base rule.
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