Advanced Materials and Processes Research Institute
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Assessing the Effect of Thermoset Polyester Resin Waste Powder on the Processing and Mechanical Properties of Natural Rubber.
No full textProducts made of glass fibre reinforced polymers are often disposed of in landfill,\ud
incinerated or processed into waste powders at the end of their service life. Waste\ud
powders can be recycled as fillers for use in virgin polymers. The effects of up to 50\ud
parts per hundred rubber by weight thermoset polyester resin waste powder on\ud
the viscosity, cure and mechanical properties of a sulphur-cured natural rubber\ud
compound were studied. The powder had resin polymer particles and glass fibre\ud
fragments ranging from approximately a few microns to 700 microns in size.\ud
The viscosity remained unchanged and the cure properties deteriorated when the\ud
powder was added to the rubber. The hardness, Young’s modulus and tensile modulus\ud
increased whereas, the tensile strength, elongation at break, stored energy density at\ud
break and tearing energy decreased. There was also evidence of poor adhesion\ud
between the powder and rubber. It was concluded that the waste powder could be\ud
recycled as an extender filler to replace a portion of the raw rubber in the compound
Slurry Wear Characteristics of Zinc-Based Alloys: Effects of Sand Content of Slurry, Silicon Addition to Alloy System and Traversal Distance.
No full textThis investigation deals with the observations pertaining to the effects of specimen and slurry compositions as well as\ud
traversal distance on the slurry wear response of a zinc-based alloy. The composition of the alloy was altered by adding 4% silicon to it. The slurry composition was varied through changing the concentration of the sand particles in the range of
Development of celsian ceramics from fly ash useful for X-rayradiation-shielding application
No full textFor the first time the capability of fly ash to produce barium containing radiopaque materials has been demonstrated. Fly ash which is a waste generated in power plants due to combustion of pulverized coal, has been utilizeda for making X-ray radiation-shielding materials. A novel method for making radiation-shielding materials utilizing fly ash and barium compound has been developed by ceramic processing route using phosphate bonding. The fly ash based radiopaque materials (FARM), i.e. shielding materials are characterized for their X-ray attenuation characteristics. The shielding, i.e. half value thickness (HVT) for different energies of X-ray photons for FARM have been computed and compared with conventionally used shielding materials, namely concrete and lead, it is found that the HVT of the fly ash based shielding materials, in comparison to concrete, is significantly very less for the various energies of X-ray photons. The X-ray powder diffraction studies confirmed the presence of monoclinic and hexagonal celsian and sanbornite as the major shielding phases and potassium aluminosilicate, sodium aluminosilicate and silicophosphate as the binder phases in the FARM and are responsible for providing bonding to the ceramic matrix leading to the effective shielding and mechanical properties. Scanning electron microphotographs have revealed\ud
the compacted plate like particles with hexagonal morphological characteristics of the various barium silicate and barium aluminosilicate (BAS) shielding phases in the matrix of radiopaque materials. The mechanical properties, namely compressive strength and impact strength evaluation\ud
test showed that FARM meets the standard specifications laid down for radiation-shielding concrete and ceramic tiles. Based on the above studies, it is found that FARM, can preferably be used for the construction of X-ray diagnostic and CT-scanner room to provide adequate shielding agains
`Discoloration of Rhodamine B dyeing wastewater by schorl- \ud catalyzed Fenton-like reaction’ \ud
No full text
Concentration Profile of Glass Fiber Bundles in Epoxy-\ud Based Gradient Composites During Centrifugation
No full textThe short fiber bundles separated from the\ud
machining waste of a printed circuit board (PCB) manufacturing\ud
plant were used in preparing functionally graded\ud
composites using polysulfide-modified epoxy resin. The\ud
graded material was developed using centrifugation technique.\ud
The centrifugation time was varied to obtain different\ud
gradient profiles. The concentration profile was then\ud
compared with the theoretical HD model (Hashmi-Dwivedi\ud
model), which was modified to accommodate the\ud
changes in the shape of suspending particles. A shape factor\ud
was introduced in terminal velocity estimation. The\ud
simulated results are in agreement with the experimental\ud
trend
Compressive Deformation and Energy Absorption Characteristics of Closed Cell Aluminum-Fly Ash Particle Composite Foam
No full textDeformation response and energy absorption characteristics of closed cell aluminum-fly ash particle composite foam have been assessed under compressive loading at different strain rates (10−2 to 101 s−1). The investigated foams were made by melt route using CaH2 as foaming agent. The influence of strain rate on the deformation responses is found to be very marginal; within the domain considered in the present study, and the strain rate sensitivity was measured to be very low and varying in the range of 0.02–0.04 when the foam relative density is greater than 0.1. The plateau stress, and energy absorption increase significantly following power law relationship with relative density; whereas the densification strain is almost invariant to the relative density. The strain rate sensitivity of the investigated material was found to be negative when the foam relative density is less than 0.1
Cenosphere filled aluminum syntactic foam made through stir-casting technique
No full textCenospheres in the range of 30–50 vol.% were used as space holders for making syntactic aluminum foam having density 1.5–1.9 gm/cc using stir-casting technique. The synthesized syntactic foam (SF) was characterized in terms of microstructures, hardness and compressive deformation behaviour. It was noted that the SF behaves like a high strength aluminium foam under compressive deformation exhibiting flat plateau region in the stress–strain curves. The plateau stress of SF decreases with cenosphere volume fraction vis-à-vis porosity following a power law relationship. But, the densification strain increases linearly with cenosphere volume fraction
Modelling of Evaporative Cooling of Porous Medium Filled with Evaporative Liquid
Full text linkThe cooling effect by evaporative liquid is modeled by considering that heat is transferred from the system to the surrounding due to evaporation of liquid through the pores present in the medium. The variation of cooling rate with cell size, volume fraction of pores and physical conditions has been analyzed. The model demonstrates that it increases with increase in thickness of the foam slab and with increase in velocity of air. It is also observed that cooling effect decreases with decrease in volume fraction of porosity and with increase in relative density, cell size, thermal conductivity and relative humidity
Influence of SiC particles addition on the corrosion behavior of 2014 Al-Cu alloy in 3.5% NaCl solution.
No full textThe influence of silicon carbide particles (SiCp) addition on the corrosion behavior of Al–Cu alloy (2014) was evaluated in 3.5% NaCl solution at 30 °C using microstrucural and electrochemical measurements. Addition of 10 wt.% SiCp to the base alloy is found to increase its corrosion resistance considerably. Incorporation of SiCp beyond this proportion leads to an increase in corrosion rate of the synthesized composites. Addition of 25 wt.% SiCp to base alloy decreases corrosion resistances considerably. Microstructural studies reveal the agglomeration of SiC particles in the composites. This results an increase of corrosion reaction with the increase of SiC particles in the composites. EIS measurement indicates the occurrence of adsorption/diffusion phenomena at the interfaces of the composites that ultimately initiate the localized or pitting corrosion