Hot corrosion behaviour of nanostructured zirconia in molten NaVO3 salt. Issue 13 (September 2017)

• Record Type: Journal Article
• Authors: Wang, Jinshuang; Sun, Junbin; Zou, Binglin; Zhou, Xin; Dong, Shujuan; Li, Lifen; Jiang, Jianing; Deng, Longhui; Cao, Xueqiang
• Is Part Of: Ceramics international. Volume 43:Issue 13(2017)
• Page Start: 10415
• Page End: 10427
• Publication Date: 2017-09
• Subjects: n-YSZ -- Grain size -- Hot corrosion -- Phase transformation; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2017.05.077
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: 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% Y2 O3 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 °C. During hot corrosion, NaVO3 reacts with Y2 O3 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.