Abstract
The Fe-based amorphous composite coatings with various content of Al2O3–13%TiO2 (AT13) additions (0–20 wt%) were prepared on 45 steel substrate by plasma spraying. The microstructure, porosity, toughness and wear resistance of the Fe-based amorphous coating and composite coatings were studied, respectively. The results show that the addition of AT13 doesn't affect the glassy formation ability of amorphous phase. The porosity of the composite coatings decreases significantly with the increase of the second phase weight fraction, and the porosity of coating with 15 wt% AT13 is only 1.12%. Tribological results indicate that the composite coatings have superior wear resistance than that of the single amorphous coating, such as the lower friction coefficient and wear rate. It was found that the 15 wt% AT13/Fe-based composite coating exhibited the most excellent wear resistance, resulting from the wear rate of which is about a quarter of that of the monolithic amorphous coating under the 300 r/min test conditions. At high sliding speed, the wear mechanism of the composite coating is a combination of fatigue wear, oxidative wear and adhesive wear.
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