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首页> 外文期刊>Journal of Thermal Spray Technology >Air Plasma-Sprayed Yttria and Yttria-Stabilized Zirconia Thermal Barrier Coatings Subjected to Calcium-Magnesium-Alumino-Silicate (CMAS)
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Air Plasma-Sprayed Yttria and Yttria-Stabilized Zirconia Thermal Barrier Coatings Subjected to Calcium-Magnesium-Alumino-Silicate (CMAS)

机译：经受钙镁铝硅酸盐（CMAS）的空气等离子体喷涂氧化钇和稳定化氧化锆的热障涂层

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摘要

Yttria (Y2O3) and zirconia (ZrO2) stabilized by 8 and 20 wt.%Y2O3 thermal barrier coatings (TBCs) subjected to calcium-magnesium-alumino-silicate (CMAS) have been investigated. Free-standing Y2O3, 8 and 20 wt.%YSZ coatings covered with synthetic CMAS slurry were heated at 1300 A degrees C in air for 24 h in order to assess the effect of Y2O3 on the corrosion resistance of the coatings subjected to CMAS. The microstructures and phase compositions of the coatings were characterized by SEM, EDS, XRD, RS, and TEM. TBCs with higher Y2O3 content exhibited better CMAS corrosion resistance. Phase transformation of ZrO2 from tetragonal (t) to monoclinic (m) occurred during the interaction of 8YSZ TBCs and CMAS, due to the depletion of Y2O3 in the coating. Some amounts of original c-ZrO2 still survived in 20YSZ TBCs along with a small amount of m-ZrO2 that appeared after reaction with CMAS. Furthermore, Y2O3 coating was found to be particularly highly effective in resisting the penetration of molten CMAS glass at high temperature (1300 A degrees C). This may be ascribed to the formation of sealing layers composed of Y-apatite phase [based on Ca4Y6 (SiO4)(6)O and Y-4.67(SiO4)(3)O] by the high-temperature chemical interactions of Y2O3 coating and CMAS glass.
机译：研究了通过8和20 wt。％的Y2O3热障涂层（TBC）稳定的氧化钇（Y2O3）和氧化锆（ZrO2），该涂层经过钙镁铝硅酸盐（CMAS）处理。将覆盖有合成CMAS浆料的8重量％和20重量％的Y2O3自立式涂料在空气中于1300 A的温度下加热24小时，以评估Y2O3对经受CMAS的涂料的耐腐蚀性的影响。通过SEM，EDS，XRD，RS和TEM表征了涂层的微观结构和相组成。 Y2O3含量较高的TBC表现出更好的CMAS耐腐蚀性。由于涂层中Y2O3的耗尽，在8YSZ TBC和CMAS相互作用期间，ZrO2从四方（t）转变为单斜晶（m）。某些原始c-ZrO2仍能幸存下来，而少量的m-ZrO2则在与CMAS反应后出现在20YSZ TBC中。此外，发现Y 2 O 3涂层在抵抗高温（1300 A℃）下的熔融CMAS玻璃的渗透方面特别有效。这可能归因于Y-磷灰石相[基于Ca4Y6（SiO4）（6）O和Y-4.67（SiO4）（3）O]组成的密封层的形成，这是由于Y2O3涂层和CMAS玻璃。

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