文献类型：会议论文

英文题名：Preparation and Calcium-Magnesium-Alumina-Silicate Corrosion Resistance of (RE0.5Yb0.5)2Si2O7 (RE = Sc, Er, or Yb) Ceramics at 1500 °C

作者：Li, Kaibin[1];Wang, Weize[1];Yang, Shilong[1];Liu, Yangguang[1];Li, Hongchen[1];Zhang, Wenkang[1];Wang, Changliang[2];Du, Xiuxin[2]

机构：[1]East China Univ Sci & Technol, Minist Educ, Key Lab Pressure Syst & Safety, Shanghai, Peoples R China;[2]AECC Beijing Inst Aeronaut Mat, Aviat Key Lab Sci & Technol Adv Corros & Protect, Beijing, Peoples R China

会议论文集：22nd International Corrosion Congress-ICC

会议日期：OCT 22-26, 2024

会议地点：Xi'an, PEOPLES R CHINA

语种：英文

外文关键词：Rare-earth disilicates; Corrosion; Calcium-magnesium-alumina-silicate; Environmental barrier coating materials

摘要：The demand for high operating temperatures in gas turbine engines requires an urgent need for environmental barrier coatings (EBCs) materials that exhibit excellent resistance to molten calcium-magnesium-aluminum-silicate (CMAS) glasses. In this study, three types of (RE0.5Yb0.5)(2)Si2O7 (RE = Sc, Er, or Yb) bulk ceramics were prepared using an in-situ solid-phase reaction method, and their CMAS corrosion behaviors were investigated at 1500 degrees C. The results indicated that all the prepared bulk ceramics exhibited high densification and ss-disilicate phase purity, and they showed both dissolution and penetration phenomena under CMAS corrosion at high temperatures. For Yb2Si2O7 and (Sc0.5Yb0.5)(2)Si2O7 ceramics, no significant apatite phase was detected. However, a large amount of apatite phases was observed in the CMAS residual zone of (Er0.5Yb0.5)(2)Si2O7 ceramics. Furthermore, it is probable that (Sc0.5Yb0.5)(2)Si2O7 has the smallest average RE-O bond length, leading to the highest resistance to CMAS dissolution, which is approximately 4.6 times higher than that of Yb2Si2O7, and 5.5 times higher than that of (Er0.5Yb0.5)(2)Si2O7. These findings may provide insights into the modification of CMAS corrosion resistance after doping of Sc or Er elements into the Yb2Si2O7 matrix lattice, and lay the foundation for designing high-entropy EBCs with superior CMAS resistance.