Microstructure and thermo-physical properties of yttria stabilized zirconia coatings with CMAS deposits
作者： Jing Wu , Hong-bo Guo , Yu-zhi Gao , Sheng-kai Gong
DOI: 10.1016/J.JEURCERAMSOC.2011.04.006
关键词:
摘要: Abstract Yttria stabilized zirconia (YSZ) thermal barrier coatings (TBCs) are used to protect hot-components in aero-engines from hot gases. In this paper, the microstructure and thermo-physical mechanical properties of plasma sprayed YSZ under condition calcium–magnesium–alumina–silicate (CMAS) deposits were investigated. Si Ca CMAS rapidly penetrated coating at 1250 °C accelerated sintering coating. At interface between coating, was partially dissolved CMAS, inducing phase transformation tetragonal monoclinic phase. Also, porosity reduced ∼25% 5%. As a result, diffusivity 1200 °C increased 0.3 mm2/s 0.7 mm2/s, suggesting significant degradation effect. showed ∼40% increase microhardness. The mechanism TBC induced by discussed.
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