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Chennai, India

Babu V.R.,Salem College | Koushik C.V.,Salem College | Lakshmikantha C.B.,Madha Engineering College | Subramaniam V.,Jaya Engineering College
Indian Journal of Fibre and Textile Research | Year: 2011

A technique based on electrical open and closed circuit principle has been used to measure the vertical capillary height of the liquid in the fabric as the function of time. Vertical wicking height for different types of fabrics with different yarn counts and fabric densities is observed. It is found that the yarn count and fabric density influence the wicking behavior of the fabrics.

Tamilarasan K.,Madha Engineering College | Dharmendira Kumar M.,Anna University
Biocatalysis and Agricultural Biotechnology | Year: 2012

Solvent tolerant extracellular lipase from Bacillus sphaericus MTCC 7542 was purified by DEAE-Sepharose anion exchange chromatography. This purification resulted in 377U/mg specific activity and 17.33-fold with 5.7% recovery obtained. The molecular weight of the purified lipase was determined to be 69kDa using SDS polyacrylamide gel electrophoresis and conformed by zymogram. The purified lipase showed optimal activity and stability at pH 8.0 and 40°C. The purified lipase was stable in the presence of hydrophobic solvents like n-butanol, benzene, hexane and toluene. Lipase activity was promoted in the presence of Mg 2+, Ca 2+, Cu 2+, K + and Tween 80. © 2012 Elsevier Ltd.

Baradeswaran A.,Anna University | Baradeswaran A.,Madha Engineering College | Elaya Perumal A.,Anna University
Composites Part B: Engineering | Year: 2014

This work investigated the influence of graphite on the wear behavior of Al 7075/Al2O3/5 wt.% graphite hybrid composite. The investigation reveals the effectiveness of incorporation of graphite in the composite for gaining wear reduction. The Al 7075 (aluminium alloy 7075) reinforced with Al2O3-graphite were investigated. The composites were fabricated using liquid metallurgy route. Ceramic particles along with solid lubricating materials were incorporated into aluminium alloy matrix to accomplish reduction in both wear resistance and coefficient of friction. The Al 7075/Al2O3/graphite hybrid composite was prepared with 5 wt.% graphite particles addition and 2, 4, 6 and 8 wt.% of Al2O3. The hardness, tensile strength, flexural strength and compression strength of the Al 7075-Al2O3-graphite hybrid composites are found to be increased by increased weight percentage of ceramic phase. The wear properties of the hybrid composites containing graphite exhibited the superior wear-resistance properties. © 2013 Elsevier Ltd. All rights reserved.

Baradeswaran A.,Madha Engineering College | Elaya Perumal A.,Anna University
Tribology Transactions | Year: 2015

The influence of graphite particulates on the dry sliding wear behavior of aluminum alloy 7075 (AA7075)–graphite composites has been evaluated using a pin-on-disc apparatus. The materials were fabricated by a liquid casting technique. Composites with 5–20 wt% graphite particles were processed. The casted composites were subjected to T6 heat treatment. The effect of sliding speed and sliding distance has been studied under dry sliding conditions. The hardness of the composites is measured using a Brinell hardness tester and their tensile strength is measured using a universal testing machine. The wear rate of the composites reduced with the addition of graphite content and reached a minimum with 5 wt% graphite content. The coefficient of friction is decreased with the addition of graphite content and reached a minimum at 5 wt% graphite. The effect of graphite on hardness and tensile strength is also studied. The worn surfaces of the pin specimen are analyzed with scanning electron microscopy. The 7075 aluminum alloy exhibited its potential to act effectively as a self-lubricating material under dry sliding conditions in the lower range of graphite content, and 5 wt% graphite appeared to be optimum. © 2015, Copyright © Society of Tribologists and Lubrication Engineers.

Saravanan I.,Anna University | Elaya Perumal A.,Anna University | Selvakumar N.,Mepco Schlenk Engineering College, Sivakasi | Baradeswaran A.,Madha Engineering College
Materials and Design | Year: 2015

Titanium nitride (TiN) is a hard ceramic biocompatible material, which is deposited over stainless steel (SS) 316L to improve the mechanical and wear properties when sliding against Ti-6Al-4V alloy for artificial hip joints. Arc deposited TiN coating thickness was measured, using an optical microscope. The surface hardness of the TiN coated surface has been improved 9 times more than that of the uncoated steel surface. The crystallography of the coated surface was examined by the X-ray diffraction analysis, and the topography of the coated surface was inspected, using the Atomic Force Microscope. The wear test was conducted, using the ball-on-disc, with the varying parameters of the applied load (2-6. N), sliding velocity (0.25-0.75. m/s) and sliding distance (500-1500. m). The Worn surface of the coated and uncoated sample was studied, using the Field Emission Scanning Electron Microscope. It was concluded that the presence of TiN coating on the SS 316L surface exhibits superior wear resistance and coefficient of friction. The optimum parameters of wear and friction were identified, using Response Surface Methodology, and some useful conclusions were made. © 2014 Elsevier Ltd.

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