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4652 |
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Thursday, May 12, 2016, Room 3C + 3D 3:00 PM Amorphous Coatings |
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Enhancement of wear, impact and corrosion resistance of Fe based amorphous coatings by the addition of alumina particles |
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Muhammad Yasir* / Institute of Space & Technology, Pakistan Lin Liu / HUST, China Zhang Cheng/ HUST, China Wei Wang/ HUST, China Peng Xu/ HUST, China |
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The influence of the addition of Al2O3 particles on the wear and impact properties of Fe-based amorphous coatings has been studied. The wear behaviors were evaluated in air and in 3.5 wt. % NaCl solution. The homogeneously distributed hard Al2O3 particles resulted in improved wear resistance and reduced coefficient of friction (COF) in both conditions. The composite coating reinforced with 20 wt.% Al2O3 particles exhibit the best wear performance, having extremely low COF (<0.2) and high wear resistance (2-3 times higher than monolithic amorphous coating). Detailed SEM analysis indicated that the wear is dominated by oxidative delamination in air and by corrosion wear in 3.5% NaCl solution. Furthermore, the impact resistance/damage tolerance of amorphous coatings was also improved three times by the addition of alumina particles. The deformation and fracture behavior under impact loading were investigated via scanning electron microscopy observations as well as finite element simulation. 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. |