离子半径
腐蚀
材料科学
兴奋剂
溶解
陶瓷
锆酸盐
分析化学(期刊)
无机化学
冶金
离子
物理化学
钛酸酯
化学
有机化学
光电子学
色谱法
作者
Yifei Dai,Yuxuan Liao,Aoping He,Huan He,Tianquan Liang
摘要
Abstract The hot corrosion behaviors of the Sc 2 O 3 –Gd 2 O 3 –Y 2 O 3 co‐doped ZrO 2 (SGYSZ) ceramics in Na 2 SO 4 + V 2 O 5 molten salts at high temperature were investigated in this work. The results show that the SGYSZ exhibits good hot corrosion resistance to the 50 wt% Na 2 SO 4 + 50 wt% V 2 O 5 molten salts at 1000°C. It is attributed to the doping of small Sc 3+ , which can decrease the M–O bonding length and increase the binding energy, and then reduce the dissolution and loss of the stabilizer as rare‐earth cations Gd 3+ and Y 3+ from the SGYSZ. The significant synergistic effects of Sc 3+ , Gd 3+ , and Y 3+ are beneficial to enhance the phase stability and corrosion resistance of the zirconate ceramic due to the different ionic radius and basicity of rare‐earth oxides (RE 2 O 3 ). More Gd 3+ in SGYSZ can promote the forming and coarsening of the GdVO 4 during mineralization, which can also decrease the loss of Y 3+ from the SGYSZ. The corrosion mechanism is discussed in detail.
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