By Helen Zhang, David Jin, X. J. Zhao
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Extra resources for Advanced Research on Mechanical and Electronic Information Engineering II
Conventional and nanosturctured Al2O3–13 wt% TiO2 ceramic coatings were deposited by plasma spraying on TiAl alloy surface. Laser remelting experiment on as-sprayed coatings was carried out and the influences of laser remelting on microstructure and thermal barrier effect of the coating were researched. The results show that the as-sprayed conventional coating has a typical plasma-sprayed lamellar-like structure, while the nanostructured coating consisted of both fully melted regions and partially melted regions.
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The coating material studied in this research was Al2O3–13 wt% TiO2 agglomerated ceramic powders (Inframat Corporation, USA), which were 10 μm to 50 μm in diameter. The ceramic powders were preset on the substrate by the squash presetting method. 35 mm. , USA). 5 mm laser beam diameter, and 500 °C Advanced Materials Research Vol. 978 37 preheating temperature of substrate. Furthermore, 5 L/min of argon flow was blown to the clad region to prevent heavy oxidation. The shape, microstructure and element distribution of clad coatings were characterized via an S-3400N scanning electron microscopy (Hitachi, Japan) and a INCAx-sight energy dispersive spectroscopy (Oxford, UK).