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首页> 外文期刊>International Journal of Heat and Mass Transfer >Thermal radiation and conduction in functionally graded thermal barrier coatings. Part Ⅰ: Experimental study on radiative properties
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Thermal radiation and conduction in functionally graded thermal barrier coatings. Part Ⅰ: Experimental study on radiative properties

机译：功能梯度隔热涂层中的热辐射和热传导。第一部分：辐射特性的实验研究

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Functionally graded thermal barrier coatings (FGTBCs) are functional composites with multilayered structures whose mechanical properties are better than those of conventional ceramic thermal barrier coatings (TBCs). Although many theoretical and experimental studies concerning both the mechanical properties and heat transfer including heat conduction and thermal radiation of TBCs have been conducted, little attention was paid to heat transfer process, especially the coupled conduction-radiation heat transfer, inside FGTBCs. This two-part paper systematically studied the heat transfer inside YSZ/NiCoCrAlY FGTBCs. In Part I, we investigated their radiative properties through experimental measurements. In Part II, we presented a study on the thermal conductivity of FGTBCs and established a coupled heat transfer model. In this paper, more than thirty yttria-stabilized zirconia (YSZ)/NiCoCrAlY duplex TBC and multilayered FGTBC samples with different multilayer structures, porosities and thicknesses were fabricated via air plasma spraying. The transmittance and reflectance spectra within the 0.3-15 mu m wavelength range were experimentally obtained by UV-visible spectrometry and Fourier transform infrared spectroscopy. A scanning electron microscope analysis was carried out to characterize the microstructures of FGTBCs. Additionally, we studied each layer of the FGTBCs individually; the four flux method was employed to obtain the radiative properties based on our experimental measurements. Functionally graded materials (FGM) show larger absorption coefficients and smaller scattering coefficients compared to pure YSZ. The FGTBCs show lower reflectance than YSZ TBCs. We also study the influence of the number of layers on reflectance. The results indicate that FGTBCs have worse thermal insulation ability against radiative flux tconventional ceramic TBCs of the same thickness. This paper provides practical guidance to improve the design of YSZ/NiCoCrAlY FGTBCs and other FGM coatings to reach a balance between good thermal insulation and mechanical strength. (C) 2019 Elsevier Ltd. All rights reserved.
机译：功能梯度隔热涂层（FGTBC）是具有多层结构的功能性复合材料，其机械性能优于常规陶瓷隔热涂层（TBC）。尽管已经进行了许多有关机械性能和传热的理论和实验研究，包括TBC的热传导和热辐射，但对FGTBC内部的传热过程，特别是耦合传导-辐射传热的关注很少。这篇由两部分组成的论文系统地研究了YSZ / NiCoCrAlY FGTBC内部的传热。在第一部分中，我们通过实验测量研究了它们的辐射特性。在第二部分中，我们提出了关于FGTBCs导热系数的研究，并建立了耦合传热模型。本文通过空气等离子体喷涂制备了三十多种氧化钇稳定的氧化锆（YSZ）/ NiCoCrAlY双相TBC和多层FGTBC样品，这些样品具有不同的多层结构，孔隙率和厚度。通过紫外-可见光谱法和傅里叶变换红外光谱法实验获得了在0.3-15μm波长范围内的透射光谱和反射光谱。进行了扫描电子显微镜分析以表征FGTBC的微观结构。此外，我们分别研究了FGTBC的每一层。根据我们的实验测量结果，采用四通量法获得辐射性能。与纯YSZ相比，功能梯度材料（FGM）表现出更大的吸收系数和更小的散射系数。 FGTBC的反射率低于YSZ TBC。我们还研究了层数对反射率的影响。结果表明，FGTBCs对相同厚度的辐射通量传统陶瓷TBCs的隔热性能较差。本文为改进YSZ / NiCoCrAlY FGTBCs和其他FGM涂层的设计提供了实用指导，以在良好的隔热性和机械强度之间达到平衡。 （C）2019 Elsevier Ltd.保留所有权利。

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