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Papers by Shuvendu Tripathy

International Journal of Material and Mechanical Engineering, 2014

The present investigation has been focused on the utilization of abundantly available industrial ... more The present investigation has been focused on the utilization of abundantly available industrial waste, fly ash in useful manner by dispersing it into aluminium/aluminiummagnesium/aluminium-silicon matrices to produce composites by liquid metallurgy route. The wide size range (0.1-100µm) of fly ash particles was used The dry sliding wear behavior of the composites in the cast conditions was studied at different loads and different sliding velocities using Pin-On-Disc configuration wear testing machine. The worn surfaces and wear debris were analyzed using optical microscope and scanning electron microscope.

CRC Press eBooks, May 3, 2022

Scientific Reports

In this study, the Ho-substituted BaZrO 3 electrolyte ceramics (BaZr 1-x Ho x o 3-δ , 0.05 ≤ x ≤ ... more In this study, the Ho-substituted BaZrO 3 electrolyte ceramics (BaZr 1-x Ho x o 3-δ , 0.05 ≤ x ≤ 0.20) were synthesized through a low-cost flash pyrolysis process followed by conventional sintering. The effects of Ho-substitution in BaZrO 3 studied in terms of the structural phase relationship, microstructure and electrical conductivity to substantiate augmented total electrical conductivity for intermediate temperature solid oxide fuel cells (IT-SOFCs). The Rietveld refined X-ray diffraction (XRD) patterns revealed that pure phase with Pm m 3 space group symmetry of cubic crystal system as originated in all samples sintered at 1600 °C for 8 h. The Raman spectroscopic investigations also approved that Ho incorporation in BaZro 3 ceramics. Field Emission Scanning Microscopic (FESEM) study informed a mixture of fine and coarse grains in the fracture surface of Ho-substituted BaZrO 3 sintered samples. The relative density and average grain size of samples were observed to decrease as per the addition of Hosubstitution in BaZro 3 ceramics. The electrical conductivity study was accomplished by Electrical Impedance Spectroscopy (EIS) under 3% humidified O 2 atmosphere from 300 to 800 °C. Furthermore, the total electrical conductivity of BaZr 0.8 Ho 0.2 o 3-δ ceramic was found to be 5.8 × 10 −3 S-cm −1 at 600 °C under 3% humidified atmosphere, which may be a promising electrolyte for IT-SOFCs. Recently, the proton conductive oxide ceramics have fascinated worldwide attention due to widespread applications in intermediate temperature solid oxide fuel cells (IT-SOFCs), hydrogen separation and electrolysis of steam, etc. In this context, the rare-earth cerates and zirconates with the perovskite-type A(II)B(IV)O 3 crystallographic structure are the two foremost families of proton-conducting oxides for electrochemical applications 1-4. Generally, in these categories of oxide materials, oxygen vacancies are increased by replacement of tetravalent cation B(IV) by trivalent cation M(III) as given in the Eq. (1) using Kröger-Vink notation.

ACS Applied Energy Materials

Journal of Asian Ceramic Societies, 2016

RSC Adv., 2016

An eco-friendly fabrication of porous MgAl2O4 ceramic foam for efficient dye adsorption.

Journal of Asian Ceramic Societies, 2013

In this work, we demonstrate an effective, fast and low-cost route for the synthesis of mesoporou... more In this work, we demonstrate an effective, fast and low-cost route for the synthesis of mesoporous MgAl 2 O 4 powder. This synthesis procedure successfully reduces the overall synthesis time for nanosized MgAl 2 O 4 powder from days to a few hours. The as-synthesized powder was found to be amorphous in nature. Upon calcination at 700 • C (2 h) and 900 • C (4 h) in presence of air, the as-synthesized MgAl 2 O 4 amorphous powder was transformed into a disorder and order nanocrystalline phase respectively. The structural information of evolvement phase was analyzed through Rietveld refinement technique and Fourier transform infrared spectroscopy. The specific surface area of MgAl 2 O 4 powder calcined at 700 • C and 900 • C was found to be 118.14 m 2 /g and 74.67 m 2 /g, respectively.

Journal of Reinforced Plastics and Composites, 2010

The present investigation is focused on the utilization of abundantly available industrial waste,... more The present investigation is focused on the utilization of abundantly available industrial waste, i.e., fly-ash in a useful manner by dispersing it into aluminum/aluminum—magnesium matrix to produce composites by a liquid metallurgy route. Composites are produced with different percentage of reinforcing phase. Further, these composites are characterized using XRD, wet chemical analysis, and image analysis. Mechanical and wear properties of the composites are evaluated.