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首页> 外文OA文献 >Microstructure and phase stability of suspension high velocity oxy-fuel sprayed yttria stabilised zirconia coatings from aqueous and ethanol based suspensions
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Microstructure and phase stability of suspension high velocity oxy-fuel sprayed yttria stabilised zirconia coatings from aqueous and ethanol based suspensions

机译：悬浮液和乙醇基悬浮液的高速氧燃料喷涂氧化钇稳定氧化锆涂层的微观结构和相稳定性

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摘要

Two commercial 7-8 wt.% Yttria Stabilised Zirconia (YSZ) suspensions were sprayed by Suspension High Velocity Oxy Fuel (SHVOF) thermal spraying for advanced high temperature coatings. Heat treatments of the free-standing coatings were conducted at 800 °C and 1000 °C for 72 h. The SHVOF coatings using two liquid carriers: water and ethanol, behaved differently in terms of micro-structure and phase stability. The ethanol coatings retained a fully tetragonal composition after heat treatments; while the aqueous coatings, however, underwent the undesirable tetragonal to monoclinic phase transformation at 1000 °C, which is lower than previously reported temperatures (>1200 °C) in thermal sprayed YSZ coatings. The heat treatments not only resulted in densification of both coatings, but also caused excessive crystallite growth in aqueous coatings promoting the undesirable phase transformation. On the contrary, the ethanol suspension improved the phase stability by favouring the homogenization of yttrium during spraying.
机译：将两种市售的7-8 wt。％氧化钇稳定的氧化锆（YSZ）悬浮液通过悬架高速氧燃料（SHVOF）热喷涂进行喷涂，以用于高级高温涂料。独立涂层的热处理在800°C和1000°C下进行了72小时。 SHVOF涂料使用两种液体载体：水和乙醇，在微观结构和相稳定性方面表现不同。热处理后，乙醇涂层保留了完全四方的成分。然而，水性涂料在1000°C时发生了不希望的四方相向单斜相转变，这比以前报道的热喷涂YSZ涂层中的温度（> 1200°C）低。热处理不仅导致两个涂层的致密化，而且还导致水性涂层中晶粒的过度生长，从而导致不良的相变。相反，乙醇悬浮液通过促进喷涂过程中钇的均质化而改善了相稳定性。

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