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首页> 外文期刊>High Temperature Material Processes >Thermal cycling behavior of Yttria Stabilized Zirconia and Lanthanum Zirconate as graded and bilayer EB-PVD thermal barrier coatings
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Thermal cycling behavior of Yttria Stabilized Zirconia and Lanthanum Zirconate as graded and bilayer EB-PVD thermal barrier coatings

机译：氧化钇稳定的氧化锆和锆酸镧作为渐变和双层EB-PVD热障涂层的热循环行为

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摘要

Traditionally Yttria partially stabilized Zirconia (YPSZ) coatings are used as thermal barrier coatings (TBCs) on chambers. More and more often, they are applied on turbine blades. Investigations on some various materials with perovskite, spinel and pyrochlore structures have shown a great potential of Lanthanum Zirconate (pyrochlore) as thermal barrier coatings. In this work, Lanthanum Zirconate has been developed as a TBC using Electron Beam Physical Vapour Deposition (EB-PVD). TBCs deposited by EB-PVD exhibit a columnar grain microstructure, which is able to better balance the difference in thermal expansion between the base material and TBC during thermal cycle and hence improved the TBC lifetime. Two different coating architectures were developed for the TBCs. First a bilayer TBC consisting of YSZ and Lanthanum Zirconate was deposited. In the second approach a graded TBC with a transition from YSZ to Lanthanum Zirconate was deposited. The thermal cycling behavior of these coatings on Inconel Alloy 600 was investigated by a thermal cycling test at 1050 deg C. Additionally, the coatings were characterized by scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX). The results of thermal cycling test showed an increase in the number of cycles before fatigue from 1380 cycles for YSZ to 3390 cycles for the graded YPSZ/Lanthanum Zirconate and 4140 cycles for the bilayer YSZ/Lanthanum Zirconate.
机译：传统上，氧化钇部分稳定的氧化锆（YPSZ）涂层用作腔室上的热障涂层（TBC）。它们越来越多地应用于涡轮机叶片上。对某些具有钙钛矿，尖晶石和烧绿石结构的材料的研究表明，锆酸镧（烧绿石）具有作为隔热涂层的巨大潜力。在这项工作中，使用电子束物理气相沉积（EB-PVD）将锆酸镧开发为TBC。通过EB-PVD沉积的TBC具有柱状晶粒的微观结构，能够更好地平衡热循环过程中基材和TBC之间的热膨胀差异，从而提高了TBC寿命。为TBC开发了两种不同的涂层结构。首先，沉积由YSZ和锆酸镧组成的双层TBC。在第二种方法中，沉积了从YSZ过渡到锆酸镧的渐变TBC。通过在1050摄氏度下的热循环测试研究了这些涂层在Inconel合金600上的热循环行为。此外，通过扫描电子显微镜（SEM）和能量色散X射线分析（EDX）对涂层进行了表征。热循环测试的结果表明，疲劳前的循环次数从YSZ的1380个循环增加到渐变的YPSZ / Lanthanum Zirconate的3390个循环，而双层YSZ / Lanthanum Zirconate的4140个循环增加。

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