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- 저자 : Lalit Kumar Thakur (검색결과 2 건)
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Dinesh Kumar,Lalit Thakur 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.9
The current investigation is focused on the fabrication and characterization of Al2O3reinforced AZ91 Magnesium (Mg)matrix composites. These lightweight and wear-resistant composites were developed by incorporating the varying Al2O3reinforcement in weight percentages (wt% ages) into AZ91 Mg matrix alloy using stir casting technique in conjunction withultrasonic agitations with optimal conditions. The effects of varying wt% of reinforcements on the composite’s particledistribution, matrix-particle interfacial reaction, microstructure, mechanical and tribological attributes were investigated. The tribological performance of base matrix alloy and the developed composites was examined using a friction and wearapparatus. The analysis using SEM, OM, and XRD were accomplished to investigate the surface morphology, microstructure,and phase changes of base matrix alloy and the developed composites. The mechanical characterization shows that theinsertion of Al2O3particulates prompted the simultaneous enhancement in microhardness, impact strength, and indentationfracture toughness. The homogeneous dispersion of fine particles caused by the ultrasonic agitations was credited withimproving wear resistance. The wear tracks were formed on the worn specimen by adhesion, oxidation, erosion of soft AZ91magnesium matrix, and the delamination when assessing sliding wear, as revealed by the micro-structural investigation. The eruption of base matrix and the pull-out of the particles have both contributed to the material removal. The addition ofreinforcement above a certain limit led to the agglomeration, clustering, and uneven distribution of particles, which resultedin the deterioration in impact toughness and the wear-resistance of the composite.
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Prabir Ghosh,Lalit Kumar Thakur,Amar Nath Samanta,Subhabrata Ray 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.9
This work investigates oxidative decolorization of two different dyes, Methylene blue and Titan yellow in aqueous solution using an environmentally friendly advanced electro-chemical oxidation (electro-Fenton) process. The effect of operating conditions like H2O2 concentration, current density, initial dye concentration was studied in a batch stirred cell. Individual decolorization decay kinetics for both dyes was investigated. The second-order absolute rate constants (L mol−1 s−1) between hydroxyl radical and dye have been calculated from experimental data by fitting it to the decolorization model. The apparent kinetic constants, kapp (s−1) for Methylene blue and Titan yellow dye decolorization were also determined. The experimental data showed a good fit to the theoretical model, which can predict data in a wide range of % dye decolorization. This process also reduces COD of the dye solution, and the unit energy demand (UED) in kWh/kg COD removed for different electrical current has been reported.
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