TRIBOLOGICAL EVALUATION OF AL/TiB2/NANO-GR HYBRID COMPOSITES EXPOSED TO ELEVATED TEMPERATURE

Suswagata Poria, Goutam Sutradhar and Prasanta Sahoo
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Suswagata Poria: Department of Mechanical Engineering, Jadavpur University, Kolkata 700032, India
Goutam Sutradhar: Department of Mechanical Engineering, Jadavpur University, Kolkata 700032, India
Prasanta Sahoo: Department of Mechanical Engineering, Jadavpur University, Kolkata 700032, India

Surface Review and Letters (SRL), 2020, vol. 27, issue 04, 1-15

Abstract: High-temperature tribological behavior of hybrid Al/TiB2/nano-Gr composites is reported in this study. Fabrication of composites is done using ultrasonic cavitation assisted stir casting method. Cast composites are characterized through micro-hardness values, optical images and SEM images. Higher amount of nano-Gr incorporation reduces the hardness of hybrid composites. Effect of operating temperature on wear and friction behavior is studied for different hybrid ratios using a high-temperature tribo-tester over a temperature range of 50–250∘C and under normal load in the range of 25–75 N. Worn surfaces are characterized using FESEM images. EDX mapping of surfaces is done to observe the elements present on the surface after tribo-tests. Increase in the amount of reinforcement improves the wear resistance and friction behavior of composites at all temperatures. At lower operating load, wear rate of composites are found to be steady with increase in operating temperature. A protective layer enriched with nano-Gr particle is formed on the tribo-surface at higher temperature. Adhesion mechanism plays the dominant role in wear of hybrid composites at elevated temperatures.

Keywords: Al/TiB2/nano-Gr composite; wear; friction; high temperature (search for similar items in EconPapers)
Date: 2020
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DOI: 10.1142/S0218625X19501324

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