Microstructure and Wear Resistance of Fe-Based Amorphous Metallic Coatings Prepared by HVOF Thermal Spraying |
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Authors: | Z Zhou L Wang D Y He F C Wang and Y B Liu |
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Affiliation: | (1) College of Materials Science and Engineering, Beijing University of Technology, Beijing, 100124, China;(2) School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China |
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Abstract: | Amorphous metallic coatings with a composition of Fe48Cr15Mo14C15B6Y2 were fabricated by means of high velocity oxygen fuel (HVOF) thermal spraying process. The microstructure and wear performance
of the coatings were characterized simultaneously in this article. It is found that the coatings present a dense layered structure
with the porosity below 1.5%. The coatings primarily consist of amorphous matrix and some precipitated nanocrystals, though
a fraction of Fe-rich phases and oxide stringers also formed during deposited process. High thermal stability enables the
amorphous coatings to work below 920 K temperature without crystallization. Depending on the structural advantage, the amorphous
coatings exhibit high average microhardness of 997.3 HV0.2, and excellent wear resistance during dry frictional wear process. The dominant wear mechanism of amorphous coating under
this condition is fatigue wear, leading to partial or entire flaking off of the lamellae. In addition, the appearance of oxidative
wear accelerates the failure of fatigue wear. |
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