34 research outputs found

    Effects of Sintering Temperature on the Density And Porosity of Sodium Chloride Preforms for Open Celled Aluminium Foam Manufacturing

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    Effects of sintering temperature on the density and porosity of sodium chloride preforms for alu- minium foam manufacturing have been investigated. Cold pressed salt preforms were sintered at 30, 760 and 790 and di erent times ranging between 6- 18 hours in a carbolite furnace at a heating rate of 5/minute. The Results of density and porosity measurements show that the density and porosity of the preform can be varied by changing the sintering temperatures of the preforms. It was observed that the density of the preforms increases with sintering temperature at constant time and pre-sintering pressure while porosity has an inverse relationship with tem- perature. Results of scanning electron microscopic analyses, show sintering connection (bonding) between the salt beads at all the temperatures in which sintering was performed. Sintering of the sodium chloride perform was attributed to grain boundary di usion and evaporation condensation mechanisms.Keywords: sintering, preform, density, porosity, aluminium foa

    Swelling Characteristics and Tensile Properties of Natural Fiber Reinforced Plastic in Selected Solvents

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    The swelling behavior and tensile strength of natural fiber-reinforced plastic in premium motor spirit (PMS), dual purpose kerosene (DPK) and sea water have been studied. Composite formed by reinforcing polyester resin with Okam fibers was immersed in the selected solvents for 16 weeks (4 months). Swelling characteristics of samples of this composite material were determined by monitoring- forth nightly, changes in weight of the samples within the test period and tensile test was conducted on the samples after 16 weeks using Hounsfeild (Monsanto) tensometer. The results show that the solvents reduced the strengths of the composite with PMS giving the highest reduction in strength followed by DPK and then sea water. Reduction in strength was attributed to the weakening of the interfacial bonding between the polyester matrix and reinforcing okam fibers

    Effects of Variation of Particle Size and Weight Fraction on the Tensile Strength and Modulus of Periwinkle Shell Reinforced Polyester Composite

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    The effects of variation of particle size and weight fraction on the tensile strength and Young’s modulus of periwinkle shell reinforced polyester composite have been investigated.  Particulate reinforced polyester composites incorporating varying amounts of periwinkle shell particles (10, 20, 30, 35, 40 and 45wt %) of different particle sizes were characterized for their tensile strength and modulus of elasticity.  The tensile strength and elastic modulus improved with decreasing particle size while they increased with increasing particle loading in the range of particle sizes tested. Increase in strength with small particle sizes and increased particle loading was attributed to increase in surface area which enhanced load transfer between the polyester matrix and periwinkle shell particles

    Hybrid Effect on the Mechanical Properties of Sisal Fiber and E-Glass Fiber Reinforced Polyester Composites

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    The hybrid effect of incorporating periwinkle shell particles into sisal fiber- and E-glass fiber reinforced polyester composite was studied.  Hybrid composites of sisal/periwinkle shell and E-glass/periwinkle shell were prepared at a fixed fiber to polyester ratio of 30:70 and variable ratios of the two reinforcements namely 30:0, 20:10, 15;15, 10:20, 0:30 by weight.  Experimental samples were produced using the hand lay-up method.  Tensile, hardness and flexural tests were performed on these samples and the results showed that the addition of periwinkle shell particles improved the mechanical properties of sisal fiber reinforced composite while it reduced those of E-glass fiber reinforced polyester composite.  Improvement in strength of the sisal/periwinkle hybrid composite was attributed to the ability of the periwinkle shell particles to transfer load to the sisal fibers in the hybrid composite

    Alloy Design and Property Evaluation of Ti-Mo-Nb-Sn Alloy for Biomedical Applications

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    Ti-Mo alloy containing Nb and Sn were arc melted and composition analyzed by EDX. The XRD analysis indicates that the crystal structure and   mechanical properties are sensitive to Sn concentration. A combination of Sn and Nb elements in synergy hindered formation athermal w phase and significantly enhanced b phase stability. The low elastic modulus and good ductility as observed implied that this alloy can be more suitable for biomedical application than the conventional metallic biomaterials from better mechanical compatibility perspective

    Effect of Alkali Treatment and Fiber Content Variation on the Tensile Properties of Coir Fiber Reinforced Cashew Nut Shell Liquid (CNSL) Composite

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    The eect of alkali treatment and ber content variation on the tensile properties of coir ber reinforced cashew nut shell liquid (CNSL) composite was studied. Biocomposite consisting of coir bers and cashew nut shell liquid resin was produced using the hand lay-up technique. The bers were treated with 5% NaOH and varied between 0% to 40% weight fractions. Composite laminates with untreated coir bers were also produced with same ber loadings. The results showed that tensile strength and modulus of the CNSL/COIR composite increased as the weight fraction of coir bers was increased up to a ber content of 30%. Also the composites exhibited reduction in elongation at break as ber content was increased. The alkali- treated CNSL/COIR composite laminates showed improved tensile properties and this was attributed to an improvement of interfacial ber-matrix adhesion in the composites

    CO2 Uptake on Activated Carbon: A Comparison at Low and High Pressures

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    THIS ARTICLE HAS BEEN RETRACTED FROM CIRCULATION AS DEMANDED BY THE AUTHORS OWING TO SOME INFRINGENMENT ON COPYRIGHT ISSUES OF THE UNIVERSITY OF NOTTINGHAM, UK.   ALL REFERNCES AND CITATIONS TO THE ARTICLE ARE NOW VOIDED. THE AUTHORS REGRET ANY INCONVENIENCE THIS MAY CAUSE THE READERS AND SUBSCRIBERS TO NIJOTECH AND THEIR OTHER AFFILAITES
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