Toughening Fe-based Amorphous Coatings by Reinforcement of Amorphous Carbon.

Abstract:

:Toughening of Fe-based amorphous coatings meanwhile maintaining a good corrosion resistance remains challenging. This work reports a novel approach to improve the toughness of a FeCrMoCBY amorphous coating through in-situ formation of amorphous carbon reinforcement without reducing the corrosion resistance. The Fe-based composite coating was prepared by high velocity oxy-fuel (HVOF) thermal spraying using a pre-mixed Fe-based amorphous/nylon-11 polymer feedstock powders. The nylon-11 powders were in-situ carbonized to amorphous carbon phase during thermal spraying process, which homogeneously distributed in the amorphous matrix leading to significant enhancement of toughness of the coating. The mechanical properties, including hardness, impact resistance, bending and fatigue strength, were extensively studied by using a series of mechanical testing techniques. The results revealed that the composite coating reinforced by amorphous carbon phase exhibited enhanced impact resistance and nearly twice-higher fatigue strength than that of the monolithic amorphous coating. The enhancement of impact toughness and fatigue properties is owed to the dumping effect of the soft amorphous carbon phase, which alleviated stress concentration and decreased crack propagation driving force.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Wang W,Zhang C,Zhang ZW,Li YC,Yasir M,Wang HT,Liu L

doi

10.1038/s41598-017-04504-z

subject

Has Abstract

pub_date

2017-06-22 00:00:00

pages

4084

issue

1

issn

2045-2322

pii

10.1038/s41598-017-04504-z

journal_volume

7

pub_type

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