Hot corrosion behaviour of nanostructured zirconia in molten NaVO3 salt
Hot corrosion behaviour of nanostructured zirconia in molten NaVO3 salt
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DOI：
10.1016/j.ceramint.2017.05.077
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发表时间：
2017-09
影响因子：
5.2
通讯作者：
Jinshuang Wang;Junbin Sun;B. Zou;Xin Zhou;S. Dong;Lifen Li;Jianing Jiang;Longhui Deng;Xueqiang Cao
中科院分区：
文献类型：
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作者：
Jinshuang Wang;Junbin Sun;B. Zou;Xin Zhou;S. Dong;Lifen Li;Jianing Jiang;Longhui Deng;Xueqiang Cao
采用等离子喷涂技术制备了不同晶粒尺寸的纳米结构氧化钇稳定氧化锆（n-YSZ）粉末，该粉末是通过在不同温度下烧结纳米ZrO 2 - 4mol%Y2O3粉末制备的。研究了n-YSZ粉末及其相应的偏钒酸钠（NaVO 3）涂层在700 °C下的热腐蚀行为。在热腐蚀过程中，NaVO 3与YSZ中的Y2 O3反应生成YVO 4，导致YSZ的四斜相到单斜相的破坏性相变。n-YSZ粉体的晶粒尺寸对n-YSZ粉体及其相应涂层的热腐蚀机理没有影响。但与n-YSZ粉末相比，涂层更容易被腐蚀，且晶粒尺寸<30 nm的粉末制备的涂层具有更好的抗热腐蚀性能。
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% Y2O3powders at different temperatures. The hot corrosion behaviour of both n-YSZ powders and their corresponding coatings with sodium metavanadate (NaVO3) were investigated at 700 °C. During hot corrosion, NaVO3reacts with Y2O3in 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.