Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7888910 | Ceramics International | 2018 | 8 Pages |
Abstract
3.5 mol% Yb2O3 stabilized zirconia (YbSZ) doped with 10 mol% TiO2 (Ti-YbSZ) was produced, and its hot corrosion behavior exposed to Na2SO4 + V2O5 molten salt was investigated. The as-fabricated ceramic mainly consists of metastable tetragonal (tâ²) phase. When exposed to the molten salt at 700 °C, 800 °C, 900 °C and 1000 °C for 2 h and 10 h, YbVO4 and m-ZrO2 formed as corrosion products due to chemical reactions between the ceramics and the salt. Ti4+ in Ti-YbSZ solid solution keeps stable during the hot corrosion tests, which acts as a stabilizer for ZrO2, preventing total decomposition of the tâ² phase. After the hot corrosion tests, Ti-YbSZ has an apparently lower m phase content than Y2O3 doped Zirconia and YbSZ, indicative of better corrosion resistance. The hot corrosion mechanism of Ti-YbSZ is proposed based on Lewis acid-base rule, phase diagrams and thermodynamics.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Lei Guo, Zheng Yan, Jianxing Yu, Chenglong Zhang, Mingzhu Li, Fuxing Ye, Vincent Ji,