Microstructural Features of EB-PVD Thermal Barrier Coatings Irradiated by High-Intensity Pulsed Ion Beam

Abstract:

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Thermal barrier coatings (TBCs) fabricated by electron-beam physical-vapor deposition (EB-PVD) were irradiated by high-intensity pulsed ion beam (HIPIB) at an ion current density of 100 A/cm2 with a shot number of 1-10. Microstructural features of the irradiated EB-PVD TBCs were characterized by using X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM), respectively. All the HIPIB-irradiated EB-PVD TBC surfaces present smooth and densified features. The originated intercolumnar channels growing out to the top-coat surface and nanometer-scale gaps inside each single column were sealed after the remelting of TBC surface induced by HIPIB, resulting in formation of a continuous remelted layer about 1-2 μm in thickness. The dense remelted layer can work as a barrier against the heat-flow and corrosive gases, and gives the possibility of improving thermal conductivity and oxidation resistance of the HIPIB irradiated EB-PVD TBC.

Info:

Periodical:

Key Engineering Materials (Volumes 373-374)

Main Theme:

Edited by:

M.K. Lei, X.P. Zhu, K.W. Xu and B.S. Xu

Pages:

300-303

DOI:

10.4028/www.scientific.net/KEM.373-374.300

Citation:

C. Liu, X.G. Han, X.P. Zhu, M.K. Lei, "Microstructural Features of EB-PVD Thermal Barrier Coatings Irradiated by High-Intensity Pulsed Ion Beam", Key Engineering Materials, Vols. 373-374, pp. 300-303, 2008

Online since:

March 2008

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$35.00

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