Gui Cong, Peng Zi-Jian, Yao Jun-Teng, Wang Shu-Qi, Liu Zhan-Guo, Wang Ya-Ming, Ouyang Jia-Hu
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.
Materials (Basel). 2024 Dec 21;17(24):6254. doi: 10.3390/ma17246254.
The erosion caused by high-temperature calcium-magnesium-alumina-silicate (CMAS) has emerged as a critical impediment to the advancement of thermal barrier coating (TBC). In this study, a series of high-entropy rare earth zirconates, (LaSmDyErGd)(ZrCe)O ( = 0, 0.2, 0.4, 0.5) were synthesized through a solid-phase reaction, and their corrosion behavior against CMAS was investigated. Our findings demonstrate that numerous rare earth elements impede element diffusion, facilitate the formation of a compact oxide layer, and effectively hinder CMAS infiltration. Furthermore, rare earth elements with larger ionic radii exhibit enhanced solubility in apatite, whereas those with smaller ionic radii are more readily soluble in ZrO. In general, the utilization of the high-entropy strategy is an effective approach to significantly improving corrosion resistance against CMAS.
高温钙镁铝硅酸盐（CMAS）造成的侵蚀已成为热障涂层（TBC）发展的关键阻碍。在本研究中，通过固相反应合成了一系列高熵稀土锆酸盐（LaSmDyErGd）（ZrCe）O（ = 0, 0.2, 0.4, 0.5），并研究了它们对CMAS的腐蚀行为。我们的研究结果表明，大量稀土元素会阻碍元素扩散，促进致密氧化层的形成，并有效阻碍CMAS的渗透。此外，离子半径较大的稀土元素在磷灰石中的溶解度增强，而离子半径较小的稀土元素更容易溶解在ZrO中。总体而言，采用高熵策略是显著提高抗CMAS腐蚀性的有效方法。
