Recession of an EB-PVDYSZ Coated Turbine Blade by CaSO4 and Fe, Ti-Rich CMAS-Type Deposits
作者： Wolfgang Braue , Peter Mechnich
DOI: 10.1111/J.1551-2916.2011.04747.X
关键词: Layer (electronics) 、 Thermal barrier coating 、 Particle 、 Turbine blade 、 Yttria-stabilized zirconia 、 Corrosion 、 Materials science 、 Metallurgy 、 Phase (matter) 、 Physical vapor deposition 、 Materials Chemistry 、 Ceramics and Composites
摘要: An in-service high-pressure turbine blade with a columnar, Y2O3-stabilized ZrO2 (YSZ) thermal barrier coating (TBC) fabricated by electron-beam physical vapor deposition was investigated to access the TBC hot corrosion mechanisms during operation. The exhibits through-thickness pore filling anhydrite-type CaSO4. Chemical analysis of CMAS-type particle deposits reveals relatively low SiO2 but high CaO contents and substantial amounts Fe2O3 TiO2. scenario observed at YSZ column tips involves newly formed CaZrO3 garnet-type phase Ca3(Zr,Mg,Ti)2(Fe,Al,Si)3O12, also known as mineral kimzeyite. relationships were confirmed in laboratory experiments. CaSO4 well prove be effective solvents for introducing distinct solid-state reactions. results support idea dual process. A first stage controlled SiO2-free Ca-source, most likely primary produces thin layer. second, providing concentrations Fe2O3, TiO2, favors formation melting temperature kimzeyite presumably defines operation limit YSZ-based TBCs.
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