Advanced Materials and Processes Research Institute
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characterization of corrosion resistance properties of sel-gel aluminium coating in mine water environment
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Concentration Profile of Glass Fibre Bundles in Epoxy-Based Gradient Composites During Centrifugation
No full textThe short fiber bundles separated from the machining waste of a printed circuit board (PCB) manufacturing plant were used in preparing functionally graded composites using polysulfide-modified epoxy resin. The graded material was developed using centrifugation technique. The centrifugation time was varied to obtain different gradient profiles. The concentration profile was then compared with the theoretical HD model (Hashmi-Dwivedi model), which was modified to accommodate the changes in the shape of suspending particles. A shape factor was introduced in terminal velocity estimation. The simulated results are in agreement with the experimental trends. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 200
Effect of strain rate and relative density on compressive deformation behaviour of closed cell aluminum–fly ash composite foam
No full textCompressive deformation behaviour of closed cell aluminum–fly ash composite foam of varying relative densities (0.08–0.13) was studied at varying strain rate (10�2–101 s�1). The plateau stress follows power law relationship with relative density, whereas densification strain is found to be almost invariant to the relative density and strain rate. The strain rate sensitivity calculated in this material, in the used domain of strain rate, was noted to be very low. An empirical relation has been established to correlate plateau stress with relative density and strain rat
Chemically formulated ceramic gamma ray irradiation shielding materials utilising red mud
No full textNovel shielding materials for electromagnetic radiations have been formulated using two different approaches using red mud and processed red mud based systems. The crystallographic aspect of multicomponent and multishielding phases, in the formulated shielding materials, on the shielding efficiency has been studied. The formulated shielding materials have been evaluated for radiation attenuation using Co-60 gamma ray irradiation source and were found to reduce the shielding thickness, i.e. half value thickness, to about 40–60% of concrete. The X-ray diffraction studies confirmed the presence of bafertisite, sanbornite, celsian and troilite as the major shielding phases and phosphates of aluminium and iron as the binder phases. The SEM revealed the highly compacted and continued integrated morphological features of various shielding phases. The unique combination of these different phases is responsible for providing bonding to the ceramic matrix leading to the effective shielding and mechanical properties
Development, Mechanical, Thermal and Electrical Properties of Linseed Husk Powder Filled PVC Composites.
No full textUnmodified and modified linseed husk powder filled PVC composites having different amounts of linseed powder have been developed. Mechanical, thermal and electrical properties values have been evaluated. Tensile strength of linseed husk powder PVC composites reinforced with 0, 10, 20, 30, and 40 weight percent of linseed husk powder was found to be 33.9, 33.5, 24.5, 19.7 and 11.5 MPa, respectively. Addition of chemically modified linseed husk powder improved the tensile strength of all the composites. Flexural strength and flexural modulus decreased on adding of linseed husk powder. Treatment of linseed husk improved the flexural strength and modulus. Similarly the treatment of linseed husk powder improved the impact strength of composites, due to the improved bonding between linseed husk powder and PVC matrix. Volume resistivity and surface resistivity decreased with increasing linseed husk powder concentration due to the presence of impurities and water molecules. Vicat softening temperature increased with linseed husk powder loading. Thermal characteristics of treated and untreated linseed husk PVC composites are determined and compared with pure PVC
Concentration profile of glass fiber bundles in epoxy-based gradient composites during centrifugation.
No full textThe short fiber bundles separated from the machining waste of a printed circuit board (PCB) manufacturing plant were used in preparing functionally graded composites using polysulfide-modified epoxy resin. The graded material was developed using centrifugation technique. The centrifugation time was varied to obtain different gradient profiles. The concentration profile was then compared with the theoretical HD model (Hashmi-Dwivedi model), which was modified to accommodate the changes in the shape of suspending particles. A shape factor was introduced in terminal velocity estimation. The simulated results are in agreement with the experimental trends. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci
Effect of Sintering Atmosphere on the Corrosion and Wear Behaviour of Sol-Gel Alumina Coated Mild Steel in Chloride Environment
No full textSilica based ceramic oxides and hybrid coatings were developed using 3-(trimethoxysilyl) propylmethacrylate \ud
(TMSPM), methylmethacrylate (MMA) as the organic phase with different fractions of tetraethoxysilane (TEOS) and \ud
aluminium isopropoxide as the inorganic phase using sol-gel process which were deposited onto 316 stainless steel \ud
substrate by dip-coating technique, followed by a sintering step. Characterization of the obtained coatings was carried out \ud
by scanning electron microscopy to determine the topographical features of the coatings. Furthermore, the coatings were \ud
analyzed in this manner after the corrosion tests. Analyses of corrosion resistance for coated and uncoated samples were \ud
performed in SO4\ud
2� and Cl� solutions. The influence of the sol characteristic and composition, as well as the behaviour \ud
of the coatings during the corrosion tests were reported. The results show that coatings prevent corrosion in an acid \ud
environment, and the ceramic coating developed best resistance corrosion under those media. \u
Sliding wear and friction characteristics of sisal \ud fiber reinforced polymer composites: effect of silane coupling agent and applied load.
No full textChopped sisal fibre-reinforced polyester composites with and without silane modification were prepared. Wear and friction measurements on the chopped sisal fibre reinforced polyester composites have been performed at different loads for different weight percentages of sisal fibre by using a pin-on-disc wear and friction tester. It has been found that increase of chopped sisal fibre content increased the Pressure-Velocity (PV) limit of composites. Silane modification improved the wear resistance of untreated sisal fibre reinforced polyester composite. Coefficient of friction increased with increase of fibre content and decreased with increase of load. Wear mechanism has been discussed with the help of SEM observations. POLYM. COMPOS.