Tunable corrosion resistance of rare-earth monosilicate to molten calcia-magnesia-aluminosilicate glass by RE-doping strategy

• Published in: Corrosion science Vol. 202; p. 110319
• Main Authors: Cao, Gui, Wang, Yu-Hao, Ding, Zhao-Ying, Yang, Hua-Long, Liu, Zhan-Guo, Ouyang, Jia-Hu, Wang, Ya-Ming, Wang, Yu-Jin
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Ltd 01.07.2022; Elsevier BV
• Subjects: (Y1-xYbx)2SiO5; Aluminosilicates; Aluminum silicates; Apatite; Calcia-magnesia-aluminosilicate (CMAS) corrosion; Corrosion products; Corrosion resistance; Environmental barrier coating materials; Optical basicity; Rare earth elements; Rare-earth monosilicates; Thickness measurement; Environmental barrier coating materials; (Y1-xYbx)2SiO5; Rare-earth monosilicates; Calcia-magnesia-aluminosilicate (CMAS) corrosion
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2022.110319

In this work, CMAS corrosion behavior of hot-pressed (Y1-xYbx)2SiO5 ceramics at 1573 K within 32 h has been investigated. The corrosion products contain non-stoichiometric apatite and garnet, which form according to the dissolution-reprecipitation mechanism. With abundant calcia-magnesia-aluminosilicate, the growth rate of apatite layer increases rapidly with prolonging corrosion time, which results in the rapid corrosion especially after 4 h. Furthermore, the measured thickness of apatite layer in (Y1-xYbx)2SiO5 is much lower than the predicted value based on the optical basicity (OB) theory. This work provides a new insight of solid-solutionizing strategy in the resistance of rare-earth monosilicate to CMAS corrosion. •The producing conditions of two different CMAS corrosion products are revealed.•The variation on the growth rate of apatite layer over corrosion time is discussed.•The apatite layer thickness is smaller than the predicted value based on OB theory.