Advanced Materials and Processes Research Institute
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Synergic Effect of Reinforcement and Heat Treatment on the Two-Body Abrasive Wear of an Al–Si Alloy under Varying Loads and Abrasive Sizes
No full textIn the present study, an attempt was made to examine the synergic effect of SiC particle reinforcement and heat treatment on the two body abrasive wear behavior of an Al–Si alloy (BS: LM13) under varying loads and abrasive sizes. Silicon carbide particles with size 50–80 μm were reinforced in Al–Si alloy, in varying concentration (10 wt% and 15 wt%), by solidification process (vortex technique) and the composite melt was solidified by gravity casting in a cast iron die. The alloy and composites were solution treated at 495 °C for 8 h, quenched in water and aged at 175 °C for 6 h and cooled in air. Two body abrasive wear behaviour of cast and heat-treated alloy and composite, was examined against abrasives of different sizes (40 μm, 60 μm and 80 μm), at varying applied loads (1 N, 3 N, 5 N and 7 N), up to a sliding distance of 108 m. It has been noted that the alloy suffers from higher wear rate than that of composites either in cast or heat-treated conditions, irrespective of applied load and abrasive size. Further, in most of the cases, the wear rate of composite decreases with increase in SiC particle content. Efforts were made to correlate wear behavior of Al alloy and composites in terms of mechanical properties, microstructural characteristics, applied load and abrasive size through an empirical equation
High Stress Abrasive Wear Behaviour of Al-2014 alloy and its SiC Composite
No full textThe dispersoid Metal Matrix Composites (MMCs) of the Al-Cu alloy have shown changes in their physical and mechanical properties over the base alloy and are seen as potential materials for use in different engineering components. The present paper compares the high-stress abrasive wear behaviour under different loads and ageing conditions (the cast and heat-treated conditions) of the alloy and the SiC dispersoid reinforced composite, prepared by adopting the liquid metallurgy route by stir casting. The wear rates were obtained and compared. It was found that the composite exhibited improved wear resistance (a lower wear rate) than the alloy in both the cast and aged conditions. The high-stress abrasive wear behaviour of the alloy and the composite in the cast and heat-treated conditions were carried out and the wear rate obtained was compared.\ud
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Keywords: aluminium alloys; Al-Cu alloys; metal matrix composites; MMCs; silicon carbide; SiC dispersoid; heat treatment; hardness; high-stress wear; abrasive wear; wear rate; wear resistance.\u
Formation and Microstructure of (Ti,V)C-Reinforced Iron-Matrix Composites Using Self-Propagating High-Temperature Synthesis
No full textThe combustion synthesis of (Ti, V)C-reinforced iron-matrix composites from elemental powders was examined. Examination using scanning electron microscopy indicated that two types of carbide particles were formed having a different size and composition from each other. These were sub-micron size (Ti, V)C particles and pure TiC or TiC-rich particles of a slightly larger particle size. The development of the microstructure and formation of the two types of carbides were explained through an understanding of the reaction mechanism and the thermodynamics of the carbide phases. Increasing the amount of vanadium in the reactants led to a decrease in the carbide and the iron grain size and to a corresponding increase in microhardness.\ud
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Investigations on DC Conductivity Behaviour of Milled Carbon Fibre Reinforced Epoxy Graded Composites
No full textThis paper reports the d.c. conductivity behaviour of milled carbon fibre reinforced polysulphide modified epoxy gradient composites. Milled carbon fibre reinforced composites having 3 vol. % of milled carbon fibre and poly sulphide modified epoxy resin have been developed. D.C. conductivity measurements are conducted on the graded composites by using an Electrometer in the temperature range from 26°C to 150°C. D.C. conductivity increases with the increase of distance in the direction of centrifugal force, which shows the formation of graded structure with the composites. D.C. conductivity increases on increase of milled carbon fibre content from 0·45 to 1·66 vol.%. At 50°C, d.c. conductivity values were 1·85 × 10−11, 1·08 × 10−11 and 2·16 × 10−12 for samples 1, 2 and 3, respectively. The activation energy values for different composite samples 1, 2 and 3 are 0·489, 0·565 and 0·654 eV, respectively which shows decrease in activation energy with increase of fibr
A Novel Approach to Prepare Zn(II) Loaded Cotton Fibres with Antibacterial Property
No full textThis study is focused on investigating the feasibility of using poly(acrylamide-co-N-vinyl-2-pyrrolidone)-grafted cotton fibers for the release of Zn(II) ions under physiological conditions.\ud
The optimum grafting conditions for ceric ammonium nitrate induced graft-copolymerization of acrylamide and N-vinyl-2-pyrrolidone onto cotton fibers was found to include initiator concentration of 35 mM, catalyst HNO3concentration of 0.35 M and initiation time of 10 min. The Zn(II)-loaded grafted fibers released Zn(II) in the physiological fluid for nearly 72 h with first order diffusion constant 6.0× 10−4 min−1. The release was regulated by ion-exchange mechanism and less release was observed in protein solution. The Zn (II)—loaded fibers exhibit fair antibacterial activity
Development and high stress abrasive wear behavior of milled carbon fiber reinforced epoxy gradient composites.
No full textEffect of Sintering Temperature on Corrosion and Wear Properties of Sol-Gel Alumina Coatings on Surface Pre-Treated Mild Steel
No full textSol–gel alumina coatings were developed on the surface pre-treated (zinc-phosphated) mild steel substrate and subsequently sintered at 300 °C, 400 °C and 500 °C. The alumina sol was synthesised using aluminium iso-propoxide as a precursor material. FTIR of the boehmite (AlOOH) gel sintered at above-mentioned temperatures was employed to identify the presence of various functional groups. The microstructural features and the phase analysis of the sol–gel coated specimens were carried out using SEM and XRD respectively. The corrosion resistance of the sol–gel alumina coatings was evaluated by electrochemical measurement in 3.5% NaCl solution at room temperature. The abrasive wear behaviour of the sol–gel coated specimens was measured in two body (high stress) conditions. The experimental results revealed that the sol–gel coated specimen sintered at 400 °C has superior wear and corrosion resistance properties as compared to the sol–gel coated specimen sintered at 300 °C. However, the sol–gel coated specimen sintered at 500 °C has exhibited a very poor corrosion and wear resistance properties. Poor performance of the sol–gel coatings sintered at 500 °C could be explained to be due to (i) the presence of numerous cracks (ii) absence of organic groups in the coating
A Novel Approach to Prepare Zn(II)-loaded Cotton Fibers\ud with Antibacterial Property.
No full textThis study is focused on investigating the feasibility of using poly(acrylamide-co-N-vinyl-2-pyrrolidone)-grafted cotton fibers for therelease of Zn(II) ions under physiological conditions.\ud
The optimum grafting conditions for ceric ammonium nitrate induced graft-copolymerization of acrylamide and N-vinyl-2-\ud
pyrrolidone onto cotton fibers was found to include initiator concentration of 35 mM, catalyst HNO3concentration of 0.35 M and initiation time of 10 min. The Zn(II)-loaded grafted fibers released Zn(II) in the physiological fluid for nearly 72 h with first order diffusion constant 6.0×10−4 min−1. The release was regulated by ion-exchange mechanism and less release was observed in protein solution. The Zn (II)— loaded fibers exhibit fair antibacterial activity
