Article ID Journal Published Year Pages File Type
8025273 Surface and Coatings Technology 2016 20 Pages PDF
Abstract
Lanthanum zirconate (La2Zr2O7) has been developed as futuristic thermal barrier coatings (TBCs) for Si-based ceramic matrix composite combustor and vane applications. The large mismatch of thermal expansion coefficient between La2Zr2O7 coating and composite substrate is a key limitation to this use of TBCs. To solve this problem, SiC/La2Zr2O7 multi-component coating has been prepared on the C/SiC composites surface by combining sol-gel process and slurry. Well-dispersed, single pyrochlore structured nanoscale La2Zr2O7 powders for coating was synthesized by sol-gel method. The as-prepared SiC/La2Zr2O7 multi-component coating was well bonded to the substrate, which might be associated with the newly formed La4.67(SiO4)3O phase, with a uniform thickness of 85.8 μm. The thermal conductivity of the C/SiC composites decreased by 12% to 28% after deposition of SiC/La2Zr2O7 multi-component coating.
Related Topics
Physical Sciences and Engineering Materials Science Nanotechnology
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