Article ID Journal Published Year Pages File Type
8023412 Surface and Coatings Technology 2018 9 Pages PDF
Abstract
Spray-dried nanostructured TiO2/Bi2O3 feedstock powders were successfully incorporated into plasma sprayed NiAl composite coatings. The tribological properties of the composite coatings from RT to 800 °C were investigated. The results show that the nanostructured TiO2/Bi2O3 phases performed the typical bimodal microstructure resulting in a significant enhancement of mechanical and tribological properties of the composite coatings. The lowered friction and wear at 800 °C is attributed to the synergistic lubricating effect of Bi4Ti3O12 and NiTiO3 formed on worn surfaces by tribo-chemical reactions together with TiO2 and NiO. A continuous lubricating layer including NiTiO3 and Al2TiO5 was formed on counterfaces, which further improved the tribological behavior of composite coating at high temperatures.
Related Topics
Physical Sciences and Engineering Materials Science Nanotechnology
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