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首页> 外文期刊>CERAMICS INTERNATIONAL >Properties and residual stress distribution of plasma sprayed magnesia stabilized zirconia thermal barrier coatings
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Properties and residual stress distribution of plasma sprayed magnesia stabilized zirconia thermal barrier coatings

机译：等离子喷涂氧化镁稳定的氧化锆热障涂层的性能和残余应力分布

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Thermal barrier coatings (TBCs) are employed to protect hot section components in industrial and aerospace gas turbine engines. Conventional TBCs frequently fail due to high residual stresses generated within the coating systems owing to the difference between coefficient of thermal expansion (CTE) of the substrate & deposited layers. Functionally graded-thermal barrier coatings (FG-TBCs) with gradual variation in composition and microstructure have been proposed to minimize the problem. In the present study, three different TBC systems, one duplex and two FG-TBCs, having three and five layers, respectively, were prepared by atmospheric plasma spray (APS) process on Nimonic 90 substrates using Ni-5Al as bond coat (BC) and magnesia stabilized zirconia as top coat (TC) materials. Five layers comprising the three TBC systems were also deposited separately as individual coatings to study their characteristic properties. The coatings were characterized by a scanning electron microscope. Microhardness and CTE of the individual coatings were also measured. Finite element analysis (FEA) using ANSYS 14.5 was performed to estimate the thermal residual stresses generated within the as-sprayed coating systems. The microstructure, microhardness and CTE in the five-layer FG-TBC changed gradually as compared with duplex and three-layer FG-TBC. The lowest radial, axial and shear stresses were generated in the five-layer FG-TBC compared with those of the duplex and three-layer FG-TBC. Increasing the number of layers with a gradient in composition from BC to TC having similar thickness of coatings increased the bond strength of the FG-TBCs. The bond strength of five-layer FG-TBC was found to be almost 1.5 times as high as that of the duplex TBC.
机译：隔热涂层（TBC）用于保护工业和航空燃气涡轮发动机中的高温部件。由于基材与沉积层的热膨胀系数（CTE）之间的差异，传统的TBC经常会由于涂料系统内产生的高残留应力而失效。已提出在成分和微观结构上逐渐变化的功能梯度隔热涂层（FG-TBC），以最大程度地减少该问题。在本研究中，采用Ni-5Al作为粘结层（BC），通过在Nimonic 90基底上进行大气等离子体喷涂（APS）工艺，制备了分别具有三层和五层的三种不同的TBC系统，分别具有三层和五层。镁稳定的氧化锆作为面漆（TC）材料。包括三个TBC系统的五层也分别作为单独的涂层沉积，以研究其特性。通过扫描电子显微镜表征涂层。还测量了各个涂层的显微硬度和CTE。进行了使用ANSYS 14.5进行的有限元分析（FEA），以估算喷涂后涂层系统内产生的热残余应力。与双层和三层FG-TBC相比，五层FG-TBC的组织，显微硬度和CTE逐渐变化。与双层和三层FG-TBC相比，五层FG-TBC产生的径向，轴向和剪切应力最低。具有从BC到TC的组成梯度的具有相似涂层厚度的层数增加，增加了FG-TBC的结合强度。发现五层FG-TBC的粘结强度几乎是双工TBC的1.5倍。

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