文献类型：期刊文献

英文题名：Design of high-entropy rare-earth disilicate materials for thermal environmental barrier coatings through thermal-mechanical experiments and finite element simulation studies

作者：Li, Kaibin[1];Wang, Weize[1,2];Tur, Shan-Tu[1];Yang, Shilong[1];Lu, Xiao[1];Liu, Yangguang[1];Li, Hongchen[1];Zhang, Wenkang[1];Wang, Changliang[3];Du, Xiuxin[3]

机构：[1]East China Univ Sci & Technol, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China;[2]Shanghai Inst Aircraft Mech & Control, Shanghai 200092, Peoples R China;[3]AECC Beijing Inst Aeronaut Mat, Aviat Key Lab Sci & Technol Adv Corros & Protect A, Beijing 100095, Peoples R China

年份：2025

卷号：51

期号：8

起止页码：10551

外文期刊名：CERAMICS INTERNATIONAL

收录：;EI(收录号：20250117641290);WOS:【SCI-EXPANDED(收录号:WOS:001445270600001)】；

基金：This research was funded by the National High Technology Research and Development Program, China (2023YFB3711200); National Natural Science Foundation, China (52175136, 52130511); Science Center for Gas Turbine Project, China (P2021-A-IV-002); Shanghai Joint Innovation Program in the Field of Commercial Aviation Engines, China; Shanghai Gaofeng Project for University Academic Program Development, China; and Key Research and Development Projects in Anhui Province, China (No. 2022a05020004). The authors thank the contribution of Research Center of Analysis and Test of East China University of Science and Technology for the help on the characterization.

语种：英文

外文关键词：Thermal environmental barrier coatings; (TEBCs); High-entropy rare-earth disilicates; Thermal-mechanical properties; Periodic table; Thermal stress

摘要：Multifunctional thermal environmental barrier coatings (TEBCs) with suitable thermal-mechanical properties and low thermal stresses are urgently needed to address the composite demands of thermal barrier coatings (TBCs) and environmental barrier coatings (EBCs) for silicon carbide ceramic matrix composites (SiC CMCs) structural components in aero-engines, while the development of high-entropy rare-earth disilicates provides a new opportunity. In this study, based on the doping weight values of different rare-earth elements and the periodic orthogonal incremental doping rules, 16 types of rare-earth disilicate ceramics were prepared by the solidphase reaction method. The microstructures, thermal-mechanical properties, thermal mismatch stresses, and simulated thermal cycling stresses were investigated. A 4 x 4 thermal-mechanical periodic table for the prepared disilicates was creatively plotted and analyzed. When different rare-earth elements are doped in the Yb2Si2O7 crystal structure, they lead to different changes in phase stability, thermal conductivity, thermal expansion coefficient, microhardness, Young's modulus, fracture toughness, and thermal stresses. However, among all the prepared disilicates, the high-entropy material (Sc0.2Y0.2Er0.2Yb0.2Lu0.2)2Si2O7 not only demonstrates lower thermal conductivity and a suitable thermal expansion coefficient, but also exhibits higher microhardness and Young's modulus, as well as reduced thermal cycling stress when applied as coatings, making it the most desirable candidate for TEBCs.