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Thermal Stability of Plasma-Sprayed Thick Thermal Barrier Coatings Using Triplex Pro(TM)-200 Torch
Tao, SQ; Yang, JS; Li, W; Shao, F; Zhong, XH; Zhao, HY; Zhuang, Y; Ni, JX; Tao, SY; Yang, K
2020-09-05
Source PublicationCOATINGS
Issue9
SubtypeArticle
AbstractSegmentation-crack structured yttria-stabilized zirconia (YSZ) thermal barrier coatings (TBCs) were deposited by atmospheric plasma spraying (APS) using a Triplex Pro (TM)-200 gun. In this work, free-standing coating specimens (similar to 700 mu m) were isothermally heat-treated in air from 1200 to 1600 degrees C for 24 h and at 1550 degrees C for 20 to 100 h, respectively. The thermal aging behaviors such as microstructures, phase compositions, grain growth and mechanical properties were characterized via scanning electron microscopy (SEM), X-ray diffraction (XRD), electron backscatter diffraction (EBSD) and a Vickers hardness test. The results indicated that the as-sprayed coatings mainly consisted of metastable tetragonal (t '-YSZ) phase, but the t '-YSZ gradually partitioned into equilibrium tetragonal (t-YSZ) and cubic (c-YSZ) phases due to yttrium diffusion during thermal exposure, and with an improvement in temperature, the c-YSZ may retain or transform into another yttrium-rich tetragonal (t ''-YSZ) phase. The transformation of t-YSZ to monoclinic phase (m-YSZ) has occurred after 1550 degrees C/40 h heat treatment, and the content of the m-YSZ phase increased with the prolongation of the thermal exposure time. The variations of Vickers hardness have a correlation with pores healing and grain growth, which might be attributed to the coating sintering and m-YSZ phase formation. Furthermore, the growth pattern of the grains was investigated in detail. In service, cracks and pores proceeded along the grain boundaries, especially surrounding the small grains. It is conducive to the engineering application of TBCs fabricated with the Triplex Pro (TM)-200 gun.
DOI10.3390/coatings10090894
WOS KeywordPHASE EVOLUTION ; MICROSTRUCTURE ; MECHANISM ; BEHAVIOR
Language英语
WOS Research AreaMaterials Science
PublisherMDPI
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sic.ac.cn/handle/331005/27772
Collection中国科学院上海硅酸盐研究所
Recommended Citation
GB/T 7714
Tao, SQ,Yang, JS,Li, W,et al. Thermal Stability of Plasma-Sprayed Thick Thermal Barrier Coatings Using Triplex Pro(TM)-200 Torch[J]. COATINGS,2020(9).
APA Tao, SQ.,Yang, JS.,Li, W.,Shao, F.,Zhong, XH.,...&Yang, K.(2020).Thermal Stability of Plasma-Sprayed Thick Thermal Barrier Coatings Using Triplex Pro(TM)-200 Torch.COATINGS(9).
MLA Tao, SQ,et al."Thermal Stability of Plasma-Sprayed Thick Thermal Barrier Coatings Using Triplex Pro(TM)-200 Torch".COATINGS .9(2020).
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