Towards multifunctional thermal environmental barrier coatings (TEBCs) based on rare-earth pyrosilicate solid-solution ceramics. (September 2018)

• Record Type: Journal Article
• Authors: Turcer, Laura R.; Padture, Nitin P.
• Is Part Of: Scripta materialia. Number 154(2018)
• Page Start: 111
• Page End: 117
• Publication Date: 2018-09
• Subjects: Thermal barrier coatings -- Environmental barrier coatings -- Gas turbine engines -- Rare-earth pyrosilicates -- Ceramic solid-solutions; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2018.05.032
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: The concept of thermal environmental barrier coatings (TEBCs) for SiC-based ceramic matrix composite (CMCs) hot-section components in gas-turbine engines is elucidated. Here, a single dense TEBC layer made of low thermal-conductivity rare-earth (RE) pyrosilicate solid-solutions is expected to perform multiple functions. Several binary solid-solutions are investigated, with some satisfying the following critical requirements for dense TEBCs: (i) good thermal-expansion match with CMCs, (ii) high-temperature phase stability up to 1700 °C, (iii) low thermal conductivity, and (iv) resistance to high-temperature attack by calcia-magnesia-aluminosilicate (CMAS) melts. Other considerations and future outlook pertaining to the TEBCs concept are discussed. Graphical abstract: Unlabelled Image