rezvan yavari - Academia.edu (original) (raw)
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University of California, San Diego
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Papers by rezvan yavari
Silicon, 2017
Intermetallic compounds because of their high melting point temperature, good mechanical properti... more Intermetallic compounds because of their high melting point temperature, good mechanical properties, and high corrosion resistance are attractive. The Zr 2 Cu intermetallic compound can be produced by a mechanical alloying method. In this study, alloying was carried out by using the pure copper and zirconium powders under argon atmosphere at different time durations from 30 to 120 minutes. Milling speed was chosen as 220, 250, and 280 rpm. Mechanical alloying was done with five different balls to powder ratios (
Surface Engineering, 2017
Ni-Co/SiO 2 nanocomposite coating was deposited on the steel substrate by pulse electrodeposition... more Ni-Co/SiO 2 nanocomposite coating was deposited on the steel substrate by pulse electrodeposition method. The coatings were characterised by X-ray diffraction, field emission scanning electron microscopy technique, energy-dispersive X-ray spectroscopy and X-ray map (dispersive elemental mapping) analysis. The influences of stirring rate, pH and SiO 2 concentration parameters on the mechanical properties and corrosion resistance were studied. The zeta potential of SiO 2 nanoparticles was decreased by mounting the pH and also adsorption of the surfactant SDS. Microhardness, friction coefficient, wear and anodic polarisation were determined through Buhler microhardness tester, pin-on-disc wear test and potentiostat galvanic device, respectively. By applying optimum electrodeposition condition (stirring rate 200 rev min −1 , pH 4.6 and SiO 2 concentration 20 gL −1) incorporation of SiO 2 particles into the nickel-cobalt matrix increases which results in the preparation of coatings with high microhardness and corrosion resistance, low friction coefficient and wear mass loss.
Silicon, 2017
Intermetallic compounds because of their high melting point temperature, good mechanical properti... more Intermetallic compounds because of their high melting point temperature, good mechanical properties, and high corrosion resistance are attractive. The Zr 2 Cu intermetallic compound can be produced by a mechanical alloying method. In this study, alloying was carried out by using the pure copper and zirconium powders under argon atmosphere at different time durations from 30 to 120 minutes. Milling speed was chosen as 220, 250, and 280 rpm. Mechanical alloying was done with five different balls to powder ratios (
Surface Engineering, 2017
Ni-Co/SiO 2 nanocomposite coating was deposited on the steel substrate by pulse electrodeposition... more Ni-Co/SiO 2 nanocomposite coating was deposited on the steel substrate by pulse electrodeposition method. The coatings were characterised by X-ray diffraction, field emission scanning electron microscopy technique, energy-dispersive X-ray spectroscopy and X-ray map (dispersive elemental mapping) analysis. The influences of stirring rate, pH and SiO 2 concentration parameters on the mechanical properties and corrosion resistance were studied. The zeta potential of SiO 2 nanoparticles was decreased by mounting the pH and also adsorption of the surfactant SDS. Microhardness, friction coefficient, wear and anodic polarisation were determined through Buhler microhardness tester, pin-on-disc wear test and potentiostat galvanic device, respectively. By applying optimum electrodeposition condition (stirring rate 200 rev min −1 , pH 4.6 and SiO 2 concentration 20 gL −1) incorporation of SiO 2 particles into the nickel-cobalt matrix increases which results in the preparation of coatings with high microhardness and corrosion resistance, low friction coefficient and wear mass loss.