Microstructure of alumina/3wt.% titania coatings by plasma spraying with nanostructured powders
Xinhua Lin, Yi Zeng, Xiaming Zhou, Chuanxian Ding
Materials Science and Engineering
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 200nm in diameter. Equiaxed grains took the modification ofa -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
本站文章未经允许不得转载；如欲转载请注明出处，北京桑尧科技开发有限公司网址：http://www.sunspraying.com/
|
