Advanced Materials and Processes Research Institute
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Dry sliding wear of sintered 6061 aluminium alloy— graphite particle composites.
No full textThis article describes the dry sliding wear of 6061 aluminium alloy and composites containing up to 14 vol.% of graphite particle dispersions prepared by a power metallurgy route. Experiments were carried out with pin specimens against an EN25 steel disc using a pin-on-disc apparatus. The effects of varying sliding speed and distance, applied pressure and material characteristics, as well as the amount of graphite, on the dry sliding behaviour have been evaluated. The wear rates of the composites increased with increasing amounts of graphite. This anomalous behaviour has been attributed to the increased porosity (interconnected and interfacial) in the composites. SEM examination of the worn surfaces did not reveal the presence of graphite film on them. Most of the wear debris were flaky in nature
Semiconductor Electrodes LXI. Photoelectrochemistry of Formula in Aqueous Solutions.
No full textThe photoelectrochemical response of electrodes of single crystals of the layer‐type compound Formula prepared by vapor transport in Fe3+/Fe2+, ferrocyanide/ferricyanide, and iodide solutions was investigated. The flatband potential Formula of the electrode in Formula and Formula solutions, estimated from impedance measurements, was −0.40V vs. SCE atpH 1.5 and shifted towards more negative values by 54 mV/unit pH change to pH 12. A two‐electrode photoelectrochemical cell with a Formula anode and Pt gauze cathode in a Formula , Formula , and Formula electrolyte gave a short‐circuit photocurrent of 15 mA/cm2 and an open‐circuit photovoltage of 0.4V under xenon lamp illumination (ca. 100 mW/cm2)
Pressure induced improvement in interfacial boundry between graphite and aluminium matrix in graphite aluminium particle composites.
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Corrosion characteristics of cast aluminum alloy—3 wt% graphite particulate composites in different environments.
No full textThe corrosion behaviour of cast aluminum alloy (LM 13)—3 wt% graphite particulate composite has been investigated in oil and marine environments by a weight loss method. The room temperature corrosion behaviour of this composite has also been studied by potentiodynamic polarization measurements in sea water. Results have shown that in a marine environment, the rate of corrosion of particulate composite is higher than the base alloy and aluminum. The high corrosion rate of particulate composite in marine environment is possibly due to the graphite particles being cathodic relative to the matrix thus leading to galvanic corrosion in the presence of an electrolyte. However, this particulate composite did not show any sign of corrosion in the engine oil SAE-40 (fresh and used) at 150°C, indicating that it can safely be used in this environment
Effect of dispersed graphite on the freezing rate of gravity die cast LM 13 alloy-3 wt.% graphite particle composite.
No full textTribological properties of Al alloy particle composites.
No full textIn recent years, a variety of particle dispersed aluminum alloy composites have been synthesized. The tribological properties of these materials include sliding wear, friction, seizure resistance and abrasive wear (of composites containing solid lubricant as well as hard ceramic particles). The potential high-performance applications of Al-alloy-graphite composites include pistons for internal combustion engines and bearings. For such applications, the low stress abrasive wear rates of composites, containing high volume fractions (0.20–0.35), are comparable to that of heat treated 1045 steel