腐蚀
材料科学
陶瓷
熔点
Atom(片上系统)
渗透(HVAC)
硅酸盐
冶金
复合材料
化学工程
工程类
计算机科学
嵌入式系统
作者
Chunyu Cheng,Long Chen,Junhui Luo,Yu Sun,Guifang Li,Li Yang,Yichun Zhou
标识
DOI:10.1016/j.corsci.2023.111626
摘要
The initial calcium–magnesium–alumino–silicate (CMAS) corrosion mechanism of Hf6Ta2O17 ceramic at 1250 °C for TBC was investigated by experiment and first–principle simulation. The results showed that the Hf atom, originating from Hf6Ta2O17, substituted the Si atom of the CMAS structure, increasing the melting point of the CMAS by changing its elastic constant, which tended to prevent further penetrating of the CMAS. Meanwhile, the Ca atom, stemming from CMAS, diffused into the Hf6Ta2O17 structure and occupied the interstitial site, increasing the optical basicity value of the Hf6Ta2O17, which was advantageous to develop a dense corrosion product layer to block the CMAS corrosion attack.
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