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Aging Behavior of Water-Based YSZ Suspensions for Plasma Spraying of Thermal Barrier Coatings
Journal of Thermal Spray Technology ( IF 3.1 ) Pub Date : 2021-01-31 , DOI: 10.1007/s11666-021-01162-6
Maryam Yaghtin , Amirhossein Yaghtin , Pooria Najafisayar , Zhaolin Tang , Tom Troczynski

Suspension stability is a key parameter that should be considered in any coating process utilizing a suspension as the main feedstock. Application of water as the liquid phase for suspension preparation is promising due to its availability, low cost and no toxicity. In the present study, the effects of three surfactants, polyethyleneimine (PEI), 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) and α-Terpineol, on the functional stability of yttria-stabilized zirconia (YSZ) water-based suspensions were investigated. The changes in the suspensions’ zeta potential, pH, viscosity and Turbiscan Stability Index (TSI) were monitored over their aging time of 1 to 7 days. The results showed that α-Terpineol is the most effective surfactant to produce functionally stable suspensions with low viscosity and surface tension values. Plasma spraying of such stable suspensions results in the formation of thermal barrier coatings (TBCs) with columnar morphology having porosity in the range of 17 to 18 vol.%.



中文翻译:

热障涂层等离子喷涂用水基YSZ悬浮液的老化行为

悬浮液稳定性是在任何以悬浮液为主要原料的涂布工艺中都应考虑的关键参数。由于水的可用性,低成本和无毒性,因此将水用作制备悬浮液的液相是有希望的。在本研究中,三种表面活性剂聚乙烯亚胺(PEI),2-膦基丁烷-1,2,4-三羧酸(PBTCA)和α-松油醇对氧化钇稳定的氧化锆(YSZ)水-悬浮液进行了研究。在1至7天的老化时间内,监测悬浮液的Zeta电位,pH,粘度和Turbiscan稳定性指数(TSI)的变化。结果表明,α-松油醇是生产具有低粘度和低表面张力值的功能稳定的悬浮液的最有效的表面活性剂。对这种稳定的悬浮液进行等离子喷涂导致形成具有柱状形态的热障涂层(TBC),该柱状形态的孔隙率在17%至18%(体积)范围内。

更新日期:2021-01-31
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