Interaction between Y-Al-Si-O glass-ceramics for environmental barrier coating materials and Ca-Mg-Al-Si-O melts
Interaction between Y-Al-Si-O glass-ceramics for environmental barrier coating materials and Ca-Mg-Al-Si-O melts
复制标题
环保涂层材料用Y-Al-Si-O微晶玻璃与Ca-Mg-Al-Si-O熔体的相互作用
DOI：
10.1016/j.ceramint.2020.05.037
复制
发表时间：
2020-08-01
影响因子：
5.2
通讯作者：
Cheng, Laifei
中科院分区：
文献类型：
--
作者：
Deng, Juanli;Lu, Baofu;Cheng, Laifei
Y2 O3-Al 2 O3-SiO2（Y-Al-Si-O，YAS）玻璃是一种非常有前途的抗钙镁铝硅酸盐（Ca-Mg-Al-Si-O，CMAS）腐蚀材料，是环境屏障涂层（EBC）的绝佳候选材料。研究了组成对YAS玻璃性能和1300 ℃下耐CMAS腐蚀性能的影响，结果表明，大多数YAS玻璃具有比二硅酸钇更优越的上级CMAS腐蚀性能。Y_2O_3含量的增加和Al/Si比的降低均导致加热过程中的形核速率增加。此外，当YAS经受熔融CMAS腐蚀时，观察到两种类型的腐蚀抑制行为。一种是在高光学碱度的YAS上生成钙长石层，且其衰退深度小于二硅酸钇。钙长石颗粒的堆积阻碍了Y向腐蚀前沿的扩散，从而抑制了腐蚀。另一种机制涉及首先在具有低光学碱度的YAS上在类似于1270摄氏度下生成钙钇环硅酸盐层。接着，随着温度的升高，反应发生变化以生成非晶相。此外，该层充当屏障以抑制腐蚀。根据光学碱度（OB）理论计算，解释了两种腐蚀行为之间的差异，并预测了具有优异耐CMAS腐蚀性能的YAS成分区域。OB比CMAS高的区域显示出上级CMAS抗性，特别是对于两种物质之间的OB值的差较低的部分。
Y2O3-Al2O3-SiO2 (Y-Al-Si-O, YAS) glass is a highly promising material offering resistance against calcium magnesium aluminosilicate (Ca-Mg-Al-Si-O, CMAS) corrosion, and it is an excellent candidate for environmental barrier coating (EBC). In this study, influence of composition on YAS glass properties and CMAS corrosion resistance at 1300 degrees C was investigated, and the result indicated that most sets of YAS glass possessed the superior CMAS resistance than yttrium disilicate. The increase of Y2O3 content and decrease of Al/Si ratio both resulted in a higher nucleation rate during heating. Moreover, when YAS was subjected to the molten CMAS corrosion, two types of corrosion restraining behaviors were observed. One is the generation of anorthite layer on YAS with high-optical basicity, and the recession depth becomes less than that of yttrium disilicate. Stacking of anorthite grains obstructs the diffusion of Y to the corrosion front, which inhibits the corrosion. The other mechanism involves the generation of calcium yttrium cyclosilicate layer at similar to 1270 degrees C first on YAS with low-optical basicity. Next, with the increase in the temperature, the reaction changes to generate an amorphous phase. Moreover, the layer acts as a barrier to restrain the corrosion. Furthermore, the difference between the two corrosion behaviors was explained based on the optical basicity (OB) theory calculation, and a YAS composition region with excellent resistance toward CMAS corrosion was predicted. The region with an OB higher than that of CMAS shows superior CMAS resistance, in particular, for the portion with a lower difference in values of OB between the two substances.