A systematic study of thermomechanical properties and calcium–magnesium–aluminosilicate(CMAS)corrosion of multicomponent rare-earth phosphates  

作　　者：Keith Bryce Bishnu Pada Majee Liping Huang Jie Lian 

机构地区：[1]Department of Mechanical,Aerospace and Nuclear Engineering,Rensselaer Polytechnic Institute,NY 12180,USA [2]Department of Materials Science&Engineering,Rensselaer Polytechnic Institute,NY 12180,USA

出　　处：《Journal of Advanced Ceramics》2024年第11期1807-1822,共16页先进陶瓷（英文）

基　　金：supported as part of the DMREF:Machine Learning Accelerated Design and Discovery of Rare-earth Phosphates as Next-Generation Environmental Barrier Coatings,a standard grant funded by the Division of Materials Research,National Science Foundation under Award DMREF-2119423.

摘　　要：Multicomponent rare earth phosphates hold immense potential as next-generation environmental barrier coatings(EBCs),offering enormous possibilities and flexibility by controlling and varying their components and fractions to tailor their performance.In this work,the key material parameters(e.g.,ionic size and ionic size disorder)and the elements governing their thermal‒mechanical properties and resistance against calcium‒magnesium‒aluminosilicate(CMAS)corrosion were elucidated.The thermal conductivities of multicomponent rare-earth phosphates correlate well with cation size disorder,but no clear trend is identified for the coefficient of thermal expansion(CTE).Er-containing compositions display low CTEs and high fracture toughness.Rapid formation of a dense interfacial layer occurs for most CAMS corrosion-resistant compositions when tested at 1300°C,e.g.,(Lu_(0.2)Yb_(0.2)Er_(0.2)Y_(0.2)Gd_(0.2))PO_(4) and(Lu_(0.2)Yb_(0.2)Er_(0.2)Dy_(0.2)Gd_(0.2))PO_(4).These multicomponent phosphates also display the least recession upon molten CMAS attack at 1400°C without significant volumetric swelling,which is superior to their single-component counterparts and state-of-the-art EBCs based on rare-earth disilicates.In contrast,Sc-containing multicomponent phosphates display inferior performance against CMAS corrosion and penetration.A mechanistic understanding and understanding of the kinetics of the interfacial interaction at higher temperatures,as well as the key parameters governing their thermomechanical properties and CMAS corrosion,are valuable for designing data-driven materials of multicomponent phosphates for EBC applications.

关 键 词：environmental barrier coating(EBC) high-entropy ceramics(HECs) rare earth phosphates 

分 类 号：TG174.4[金属学及工艺—金属表面处理]