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4822 |
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Thursday, May 12, 2016, Room 3C + 3D 2:40 PM Amorphous Coatings |
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Wear and corrosion resistant Al-based metallic glass coatings by cold gas spray |
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Sergi Dosta / Thermal Spray Centre (CPT) - Universitat de Barcelona, SPAIN J. Henao / Thermal Spray Centre (CPT) - Universitat de Barcelona, Spain A. Concustell/ Thermal Spray Centre (CPT) - Universitat de Barcelona, Spain I. Garcia Cano*/ Thermal Spray Centre (CPT) - Universitat de Barcelona, Spain N. Cinca/ Thermal Spray Centre (CPT) - Universitat de Barcelona, Spain JM. Guilemany/ Thermal Spray Centre (CPT) - Universitat de Barcelona, Spain T. Suhonen/ VTT Technical Research Centre of Finland, Finland |
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The interest for metallic glasses (MGs) has been triggered in part by their unique mechanical properties, in many cases superior to their crystalline counterparts. Al-based metallic glasses have attracted attention due to their relatively low-cost, high corrosion resistance compared to conventional Aluminium alloys and high hardness. In the present work, Cold Gas Spray technology (CGS) has been used to obtain high wear and corrosion resistant Al-base metallic glass coatings. The present study showed an optimization of spraying parameters to obtain coatings with crystalline volume fractions below 25%, the first time as found in the literature. This microstructure makes the present Al-base MG coatings excellent candidates to protect Al-alloys in corrosive and wear environments. XRD and DSC characterization techniques were used to study the amorphous nature of feedstock powders and coatings, while OM, SEM and Vickers microhardness were employed to determine thickness, porosity and hardness. Sliding wear behavior and corrosion studies in NaCl solution at room temperature on the Al-base metallic glass coatings showed an improved wear resistance in the order of 200% higher and higher corrosion resistance than Al-7075 T6 substrate. |