Abstract No.:
5249

 Scheduled at:
Friday, June 09, 2017, Hall 26 3:00 PM
Amorphous Coatings


 Title:
A review on the improvement of wear, impact and corrosion resistance of the Iron based amorphous coatings by the addition of alumina particles

 Authors:
Muhammad Yasir* / Institute of Space & Technology, Pakistan
Liu Lin / HUST Wuhan, China
Zhang Cheng/ HUST, China

 Abstract:
In this paper, the influence of the addition of Al2O3 particles on the microstructure, wear, tribocorrosion and impact properties of Fe-based amorphous coatings prepared by high velocity oxygen fuel (HVOF) has been studied. The wear and tribocorrosion behaviors of the composite coatings were evaluated against Si3N4 in a pin-on-disk mode in air and in 3.5 wt% NaCl solution. It was found that the Al2O3 particles were homogenously distributed in the amorphous matrix and the composite coatings exhibited improved wear resistance and reduced coefficient of friction (COF) in both air and wet conditions as compared to the monolithic amorphous coating. The results showed that the composite coating with 20 wt.% Al2O3 particles exhibited the highest tribocorrosion resistance among the three materials tested, as evidenced by the lowest coefficient of friction (~0.3) and tribicorrosion wear rate (~1.2×10-5 mm3/N*m). Furthermore, the impact resistance was also improved three times by the addition of alumina particles. The hard second phase particles present in the amorphous coating matrix disperses the residual stresses generated during the impact loading. The brittle alumina particles absorb the impact energy by breaking itself which stop the initiation of cracks and also play a vital role in the crack arresting and blocking of the crack propagation.


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