Showing 3 results for Jadhav
Surekha S. Jadhav, Amit A. Bagade, Tukaram J. Shinde, Kesu Y. Rajpure,
Volume 19, Issue 1 (March 2022)
Abstract
In present work Ni0.7Cd0.3NdxFe2-xO4 ferrite samples (0≤x≤0.03) were prepared by using oxalate co-precipitation technique. The different characterization techniques were achieved using X-ray diffraction (XRD), FT-infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), DC electrical resistivity and dielectric measurements. The crystallographic parameters such as crystal structure, crystallite size, lattice constant, unit cell volume and theoretical density have been systematically analysed. The XRD and FT-IR measurements confirmed the formation of single phase spinel ferrite structure. The cation distribution among the octahedral and tetrahedral sites has been proposed on the basis of analysis of XRD patterns by employing Rietveld refinement analysis. The samples exist as a mixed type spinel with cubic structure. The DC electrical resistivity confirms the semiconducting behaviour and the Curie temperature decreases with increase in Nd3+ content. The dielectric constant and loss tangent decreases with frequency and higher frequencies remain constant, which shows the usual dielectric dispersion due to space charge polarization. The AC conductivity reveals that the small type polarons responsible for conduction process.
Pravin Jadhav, R.s.n Sahai, Deepankar Biswas, Asit Samui,
Volume 20, Issue 4 (December 2023)
Abstract
The present work deals with the effect of Multi-walled Carbon Nanotube (MWCNT) and functionalized (carboxyl and amine) MWCNT on the mechanical properties of the PAEK (Poly Aryl Ether Ketone) polymer composite. The MWCNT and functionalized (carboxyl and amine) MWCNT concentration varied as 0.25, 0.5 and 0.75 weight percentages. Compositeswere prepared by using a melt compounding method using a twin-screw extruder and all testing samples were prepared using an injection molding machine as per American Society for Testing and Materials (ASTM) standards. Samples were tested for tensile strength, impact strength, flexural strength, heat deflection temperature, hardness, and density. There is an increase in the tensile strength, impact strength, flexural strength, and heat deflection temperature, with percentage increase in filler loading up to 0.5 %, followed by decrease in it with higher filler loading. The increase is maximum for amine functionalized MWCNT.
Pravin Jadhav, R.s.n Sahai,
Volume 21, Issue 0 (IN PRESS 2024)
Abstract
The development of polymer composite materials for gear applications has gained significant attention due to the growing need for lightweight, corrosion-resistant, and high-performance alternatives to traditional metallic gears. This literature review consolidates key findings and insights from numerous studies, highlighting the advancements, challenges, and potential of polymer composites in gear applications. High-performance polymers such as poly ether ether ketone (PEEK), poly ether ketone(PEK), poly ether ketone ketone (PEKK) and poly aryl ether ketone (PAEK) especially when reinforced with multi-walled carbon nanotubes (MWCNTs) and functionalized MWCNTs, exhibit superior mechanical, thermal, and tribological properties. These enhancements include improved strength-to-weight ratios, wear resistance and load transfer capabilities. The review also examines the influence of various parameters on gear performance. The necessity for standardized testing methods and benchmarks to evaluate wear, surface temperature, roughness and environmental exposure is emphasized to ensure reliability and consistency. This study focuses on study of development of high performance polymer composite materials for gear applications and performance analysis of these gears.
