Novel long laminar plasma sprayed hybrid structure thermal barrier coatings for high-temperature anti-sintering and volcanic ash corrosion resistance
Novel long laminar plasma sprayed hybrid structure thermal barrier coatings for high-temperature anti-sintering and volcanic ash corrosion resistance
复制标题
DOI：
10.1016/j.jmst.2020.12.002
复制
发表时间：
2021-07
影响因子：
10.9
通讯作者：
Liu Senhui-;G. Ji;C. Li;Cheng-Xin Li;H. Guo
中科院分区：
文献类型：
--
作者：
Liu Senhui-;G. Ji;C. Li;Cheng-Xin Li;H. Guo
人工设计的热障涂层陶瓷层分段裂纹是利用大气等离子喷涂（APS）方法低成本地应用于航空发动机或燃气轮机发动机的绝佳选择。具有一定垂直裂纹间隙的涂层在热循环试验中残余热应力能通过裂纹释放。研究发现，具有垂直裂纹的涂层优于其他具有传统层状结构的涂层[1]。该工艺通常使用大气等离子喷涂方法沉积一层致密的YSZ层（通常厚度为0.5-1.5 mm），并事先使用辅助装置将基材加热到773 K以上，即使对于复杂的叶片曲面也是如此。此外，使用悬浮等离子喷涂（SPS）方法也可以沉积具有致密垂直裂纹的YSZ涂层[2]。该工艺是将纳米级饲料粉末（如0.1~1μm）溶解在水、乙醇或乙酸乙酯中，并在整个过程中使用基材的辅助加热装置来制备[13, 14]。涂层垂直裂纹间隙处的细小孔隙网络增强了声子散射，导致其导热率低于其他涂层[3, 4]。然而，使用SPS方法的沉积速率不超过APS方法沉积速率的三分之一[5, 6]。
The artificial-designed segmentation cracks in the ceramic layer of the thermal barrier coatings is an excellent choice by using the atmospheric plasma spray (APS) method under a low cost on the applications of aircraft engines or gas turbine engines. The residual thermal stress energy of the coatings with a certain inter-space of vertical cracks during the thermal cycling test is released through the cracks. The coating with vertical cracks was found out to be superior to other coatings with conventional lamellar structure [1]. This process by using the atmospheric plasma spray method usually deposited a dense layer of YSZ (usual thickness of 0.5–1.5 mm) and heating the substrate over 773 K with an auxiliary device previously, even for a complex curved surface of the vanes.Furthermore, YSZ coatings with dense vertical cracks can also be deposited by using the suspension plasma spray (SPS) method [2]. This process was prepared by using the nano-sized feed powders (eg 0.1− 1 μm) that were dissolved in water, ethanol or ethyl acetate and also with an auxiliary heating device of the substrate during the whole process [13, 14]. Fine void networks at the inter-space of the vertical cracks of coatings were enhanced the phonon scattering and leaded a low thermal conductivity than other coatings [3, 4]. However, the deposition rate by using the SPS method do not exceed than one third of the deposition rate of APS method [5, 6].