Advanced Materials and Processes Research Institute
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Sliding wear behaviour of woven glass fibre reinforced polyester composites
No full textThe dry sliding wear behaviour of woven glass fibre reinforced polyester composites has been studied by using pin-ondisc machine. The friction and wear experiments have been conducted on three different orientation of glass fibre with respect to sliding direction. The coefficient of friction and wear of the composites at various applied load and sliding speeds have been determined. The lowest coefficient of friction and wear values observed for the fibres oriented in 0°-90° direction and highest are for normal-longitudinal (N-L) orientation. The applied load further increase the friction and wear of the composites for all orientations. The friction and wear behaviour have been dominated by a number of mechanisms. The wear of the fibres has been dominated by the fibre fracture. The fibres have been fractured because of bending of fibre due to dragging by the steel disc in the sliding direction. The microscopic observations of the worn surfaces revealed and supported the involved mechanism
Performance and modeling studies of an MGS for graphite rejection in a lead concentrate.
No full textThe investigation is aimed at evaluating the performance of a Multi-Gravity Separator (MGS) in terms of rejecting graphite from a lead rougher flotation concentrate. The effect of change in different process variables on concentrate lead and graphite grades, lead recovery and graphite rejection values is studied. The results indicate that among the variables considered in this study such as drum rotation, inclination, wash water, amplitude and shake frequency, feed percent solids and feed flow rate, the change in drum revolutions influences the metallurgical results most. A suitable mathematical model for predicting the metallurgical performance under different design and operating conditions has been developed. The model included a set of equations relating the variables and the lead grade in the concentrate, lead grade and lead recovery, lead recovery and graphite rejection, and finally, the lead recovery and the graphite grade in the concentrate
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Influence of some test parameters on dry sliding wear characteristics of a zinc-11.5% aluminum alloy
No full textThis study analyzes observations made pertaining to the sliding wear response of a Zn-11.5% Al alloy in different test conditions. The wear rate and frictional heating increased with sliding speed and pressure. Seizure pressure of the samples reduced with the test speed. Frictional heating, the severity of surface and subsurface damage, and debris size increased with speed and pressure. Sticking of debris particles on the specimen surface was noted at low sliding speed. Specimen seizure was caused by the application of high pressure in view of excessive adherence of the specimen material on to the disk surface. Considerable wear-induced subsurface deformation took place in general; the degree of deformation decreased as the depth below the wear surface increased. Wear behavior of the samples is discussed in terms of the lubricating nature and thermal stability of its various microconstituents and specific characteristics of wear surfaces, subsurface regions, and debris particles
Influence of Dissolved Oxygen on Aqueous Cr(VI) Removal by Ferrous Ion
No full textHexavalent chromium [Cr(VI)] is a highly toxic and carcnogenic pollutant, introduced to the environment due to several industrial activities. Ferrous iron (Fe(II)], an important natural reductant of the Cr(VI), and its release from iron-bearing materials is now becoming a viable alternative for transforming Cr(VI) to the relatively non toxic trivalent form of chromium [Cr(III)]. Cr(VI) removal by ferrous ion at different pH is widely discussed in the literature but the influence of dissolved oxygen on the Cr(VI) removal with respect to pH, is still a contradictory subject. In the present study a systematic approach has been made to estimate the Cr(VI) removal by ferrous ion in oxygen-free and oxygen-containing aqueous solutions of pH 3 to 7. Quantitative analysis results suggest that the influence of dissolved oxygen on the Cr(VI) reduction starts at pH 4. Though, its effect appears to be in significant up to pH 6, becomes quite pronounced at pH 7 because nearly 10 to 12% less removal of the Cr(VI) was observed in the presence of the stoichiometric requirement of three equivalents of Fe(II) in oxygenated solution of pH 7. This was evidenced by carrying detailed spectrophotometric absorption measurements of the Cr(VI) in the presence of Fe(II) in its different equivalent ratios in oxygenated and deoxygenated solutions
High Stress Abrasive Wear Behaviour of Some Hardfaced Surfaces Produced by Thermal Spraying
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Morphology of PS/PMMA blends and their solution rheology
No full textPolystyrene (PS)/Polymethylmethacrylate (PMMA) blends were prepared by using solution casting method. These polymers show a tendency of mixing each other in compositions where PS is 60 wt. % or above. PS and PMMA mixed partially and formed PS-rich-phase and PMMA-rich-phase in the blend. Morphology of PSIPMMA blend prepared by solution method is discussed with the help of fractured micrographs obtained by Scanning Electron Microscope. Flow curves of solutions of PS and PMMA and their blends in toluene were studied at room temperature. The effects of blend concentration and composition on shear stress and shear viscosity were studied. The viscosity data was obtained for various weight percent of PMMA and PS separately. 15 and 20 wt% solutions of PS/PMMA blends were also studied. Power law model was fitted for shear dependency of viscosity of solutions. Shear stress increases with the addition of PS in PS/PMMA blend solution. Increase in concentration of PMMA decreased the viscosity of the PS/PMMA solution. All these systems behave as pseudoplastic systems
Organic/Inorganic hybrid fibre reinforced thermoplastic composites and their rheological properties
No full textKevlar and glass fibres have been used to reinforce linear low density polyethylene (LLDPE) and the composite sheets of 0.8 mm thickness have been obtained by using a compression molding technique. Dynamic viscoelastic properties of non hybrid and hybrid composites of various compositions are evaluated at 200°C. Dynamic viscosity (η`), storage modulus (G`) and loss modulus (G") have been determined at different angular frequencies (ω). Dynamic viscosity η' increases with reinforcement s. G' and G`` increase with angular frequency (ω) and reinforcement. Replacement of glass fibre by Kevlar at constant loading of fibres in LLDPE, increases the value of G', G`` and η'