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首页> 外文期刊>Journal of Advanced Ceramics >Mechanical properties of stabilized zirconia nanocrystalline EB-PVD coating evaluated by micro and nano indentation
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Mechanical properties of stabilized zirconia nanocrystalline EB-PVD coating evaluated by micro and nano indentation

机译：通过微米和纳米压痕评估稳定的氧化锆纳米晶EB-PVD涂层的机械性能

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摘要

Yttria-stabilized zirconia (YSZ) thin nanocrystalline coatings at different substrate preheating temperatures were deposited via electron beam-physical vapour deposition (EB-PVD). Nanocrystalline ZrO2-Y2O3 was deposited on the bond coat in order to compensate for the coefficient of thermal expansion (CTE), which can be functionalized as a thermal barrier coating (TBC). The aim of this study was to evaluate mechanical properties with respect to adhesion of zirconia nanocrystalline's top ceramic layer to the interfacial bond coat by utilizing micro and nano indentation tests. In the present paper, the structural studies were carried out using X-ray diffraction (XRD) analysis of coating content (8 mol% of Y2O3). The tetragonal phase of stabilized zirconia was observed. Field emission scanning electron microscopy (FESEM) and atomic force microscopy (AFM) were employed to characterize the coatings' morphology and microstructure. The mechanical behavior of ZrO2-Y2O3 thin films under point loading conditions was studied by nanoindentation using a Berkovich indenter with 130 nm tip radius. Therefore, adhesion of top coat to the interfacial underlying metallic bond coat known as MCrAlY (M = Ni, Co) was estimated according to the highest peak load tests; for a 120 mN peak load, the film manifested tolerable adhesion properties. Moreover, nanoindentation of ZrO2-Y2O3 nanostructure deposited at 1050 °C substrate preheating temperature produced the highest hardness value of about 21.7 GPa. Vickers micro hardness was utilized with the aid of the Tabor equation in order to achieve deeper insight into the correlation between adhesion and deposition process parameters.
机译：经由电子束物理气相沉积（EB-PVD）沉积了在不同基材预热温度下的氧化钇稳定的氧化锆（YSZ）薄纳米晶体涂层。将纳米晶ZrO2-Y2O3沉积在粘结涂层上，以补偿热膨胀系数（CTE），该热膨胀系数可以用作热障涂层（TBC）。这项研究的目的是通过利用微米和纳米压痕测试来评估氧化锆纳米晶体的顶层陶瓷层与界面粘结层之间的粘附力的机械性能。在本文中，使用X射线衍射（XRD）分析涂层含量（Y2O3的8摩尔％）进行了结构研究。观察到稳定的氧化锆的四方相。场发射扫描电子显微镜（FESEM）和原子力显微镜（AFM）被用来表征涂层的形貌和微观结构。 ZrO2-Y2O3薄膜在点负载条件下的力学行为是通过使用130纳米尖端半径的Berkovich压头通过纳米压痕研究的。因此，根据最高峰值载荷试验估算了面漆与被称为MCrAlY（M = Ni，Co）的界面下层金属粘结层之间的附着力。对于120 mN的峰值载荷，该膜表现出可忍受的粘附性能。此外，在1050°C的基板预热温度下沉积的ZrO2-Y2O3纳米结构的纳米压痕产生的最高硬度值约为21.7 GPa。借助Tabor方程，利用了维氏显微硬度，以便更深入地了解粘附力与沉积工艺参数之间的相关性。

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