Microstructure of alumina/3wt.% titania coatings by plasma spraying with nanostructured powders
Xinhua Lin, Yi Zeng, Xiaming Zhou, Chuanxian Ding
Journal of Materials Sciences & Technology (J. Mater. Sci. Technol.)
abstract
The microstructure of plasma-sprayed alumina /3wt.% titania coatings with the nanostructured powders was in vestigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results showed that the nanostructured coating exhibited a bimodal microstructure: splat lamellae similar to the con ventional coating and equiaxed grains originating from the starting feedstock. The splat lamellae consisted ofg-Al2O3grains and most of them were less than 200 nm in diameter. Equiaxed grains took the modification of a -Al2O3and ranged from 150 to 800 nm in size. In addition, the modifications of TiO2disappeared and Ti element was dissolved in g-Al2O3grains. The bimodal microstructure contributed to the improvement in mechanical properties of the nanostructured coating.
keywords:Plasma spray; Nanostructured; Al2O-TiO2coatings; Bimodal microstructure
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