Journal
CERAMICS INTERNATIONAL
Volume 43, Issue 13, Pages 10415-10427Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2017.05.077
Keywords
n-YSZ; Grain size; Hot corrosion; Phase transformation
Categories
Funding
- National Natural Science Foundation of China [NSFC 51472235]
- 15551 Program of Wuhan University of Technology [15551-01]
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Plasma sprayed coatings were fabricated from nanostructured yttria-stabilized zirconia powders (n-YSZ) with different crystalline grain sizes, prepared via sintering of nano ZrO2-4 mol% Y2O3 powders at different temperatures. The hot corrosion behaviour of both n-YSZ powders and their corresponding coatings with sodium metavanadate (NaVO3) were investigated at 700 degrees C. During hot corrosion, NaVO3 reacts with Y2O3 in YSZ to form YVO4, leading to a tetragonal to monoclinic destructive phase transformation of YSZ. The crystalline grain size of n-YSZ powders did not affect the hot corrosion mechanisms of both the n-YSZ powders and their corresponding coatings. However, compared with n-YSZ powders, the coatings were more easily corroded, and the coatings formed from starting powders with crystalline grain sizes < 30 nm featured better degradation resistance to hot corrosion.
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