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Research paper thumbnail of Spectroscopic study of electrolytic plasma and discharging behaviour during the plasma electrolytic oxidation (PEO) process

Journal of Physics D: Applied Physics, 2010

ABSTRACT In this study, a plasma electrolytic oxidation (PEO) process was used to produce oxide c... more ABSTRACT In this study, a plasma electrolytic oxidation (PEO) process was used to produce oxide coatings on commercially pure aluminium (1100 alloy) at a pulsed dc power mode. The effects of process parameters (i.e. current density and treatment time) on the plasma discharge behaviour during the PEO treatment were investigated using optical emission spectroscopy (OES) in the visible and near ultraviolet (NUV) band (285–800 nm). The elements present in the plasma were identified. Stark shifts of spectral lines and line intensity ratios were utilized to determine the plasma electron concentrations and temperatures, respectively. The plasma electron temperature profile, coating surface morphology and coating composition were used to interpret the plasma discharging behaviour. The different coating morphologies and compositions at different coating surface regions are explained in terms of three types of discharge, which originate either at the substrate/coating interface, within the upper layer, or at the coating top layer. The high spike peaks on the plasma intensity and temperature profiles corresponded to discharges originated from the substrate/coating interface, while the base line and small fluctuations were due to discharges at the coating/electrolyte interface.

Research paper thumbnail of A Study of Recovery, Recrystallization, Grain Growth and Phase Transformations during the Annealing of Cold-Worked Zircaloy-4

Research paper thumbnail of Corrosion Inhibition of Mild Steel by Polyaromatic Diimine Derivatives: A Theoretical and Experimental Study

Research paper thumbnail of Effect of magnesium content on the stress exponent and internal stress in the steady state creep of Al-Mg alloys

Research paper thumbnail of Stress change tests during the steady state creep of aluminum alloy 3004 at 300°C

Materials Science and Engineering

Research paper thumbnail of Neon ion simulation of neutron induced irradiation growth in zirconium alloys

Journal of Materials Engineering

Research paper thumbnail of Use of Navy C-rings to study and predict distortion in heat treated components: experimental measurements and computer modelling

International Heat Treatment and Surface Engineering

Research paper thumbnail of 321 The Effect of Ferrite Content and Morphology on the Mechanical Properties and Room Temperature Creep of Quenched and Tempered SAE 4340 Steel

The Proceedings of the JSME Materials and Processing Conference (M&P)

Research paper thumbnail of Hydrogen desorption kinetics of a LaNi4.7 Al0.3 metal hydride electrode using potentiostatic measurements

Fuel and Energy Abstracts

Research paper thumbnail of Polytype structures in Zr-Cr-Fe laves phase

Journal of the Less Common Metals

... Phys., 45 (1974) 2313. 29 GC Vayenas and JN Michaels, Surf. Sei., 120 (1982) L405. 30 WE Bell... more ... Phys., 45 (1974) 2313. 29 GC Vayenas and JN Michaels, Surf. Sei., 120 (1982) L405. 30 WE Bell and M. Tagami, J. Phys. Chem., 67 (1963) 2432. 31 M. Hecq and A. Hecq, J. Less-Common Met., 56 (1977) 133. 32 M. Hecq, A. Hecq and T. Robert, J. Vac. Sei. ...

Research paper thumbnail of Mechanical properties of heat affected zone in bainitic high strength low alloy steel

Materials Science and Technology

Research paper thumbnail of Comparison of carbonitriding and nitrocarburising on size and shape distortion of plain carbon SAE 1010 steel

Research paper thumbnail of Calculation of enthalpy of metal hydride formation and prediction of hydrogen site occupancy

Materials Science and Technology

Research paper thumbnail of Synthesis of Ag or Pt Nanoparticles by Hydrolysis of EitherAg2Naor PtNa

Research Letters in Materials Science

Ag and Pt nanoparticles have successfully been synthesized by hydrolysis of eitherAg2Naor PtNa at... more Ag and Pt nanoparticles have successfully been synthesized by hydrolysis of eitherAg2Naor PtNa at room temperature. The oxidation of sodium in the Pt-Na pellets was much faster than that in the Ag-Na pellets since Pt is a catalyst forH2Oformation reaction from hydrogen and oxygen at room temperature. The hydrolysis byproduct, NaOH, has a high solubility and easily is removed. This method offers a simple method of preparing transition metal nanoparticles. The Ag and Pt nanoparticles prepared by this method were crystalline in nature, and spherical in shape with a mean size of around 10 nm.

Research paper thumbnail of The influence of alloying elements on the thermoelectric power of zirconium

Journal of Materials Engineering, 1988

The influence of various alloying elements on the thermoelectric power (TEP) of zirconium is dete... more The influence of various alloying elements on the thermoelectric power (TEP) of zirconium is determined. The data indicate that the thermoelectric power is very sensitive to both the type of alloying element and its solubility in the α-phase of zirconium. For example, where tin strongly reduces the thermoelectric power of zirconium, the magnitude of the reduction increasing as the amount of tin in solution in α-Zr increases, the effect of niobium is much less pronounced and variable with first a decrease and then an increase in TEP with increasing niobium.

Research paper thumbnail of Plasma Electrolytic Oxidation (PEO) coatings on a zirconium alloy for improved wear and corrosion resistance

Tribology and Design, 2010

Research paper thumbnail of Synthesis of Ni Nanoparticles by Hydrolysis of MgNi2

Materials and Manufacturing Processes, Mar 11, 2009

MgNi2 has been shown to exhibit a hydrolysis behavior similar to that previously found for Mg2Ni.... more MgNi2 has been shown to exhibit a hydrolysis behavior similar to that previously found for Mg2Ni. The Ni nanoparticles prepared by hydrolysis of MgNi2 were spherical in shape with a mean diameter of about 16 nm. Utilizing the hydrolysis behavior of MgNi2 to produce Ni nanoparticles offers a higher efficiency than by using Mg2Ni, saves raw material and reduces any pollution resulting from the dissolution of the hydrolysis byproduct (Mg(OH)2) by using an acid.

Research paper thumbnail of ChemInform Abstract: The Hydrolysis Behavior of Mg 2 Ni and Mg 2 NiH 4 in Water or a 6 M KOH Solution and Its Application to Ni Nanoparticles Synthesis

Research paper thumbnail of The Co-Op portfolio: An essential tool for assessment and student development in co-operative engineering programs

Research paper thumbnail of An investigation into polypyrrole-coated 316L stainless steel as a bipolar plate material for PEM fuel cells

Journal of Power Sources, Dec 1, 2006

Research paper thumbnail of Spectroscopic study of electrolytic plasma and discharging behaviour during the plasma electrolytic oxidation (PEO) process

Journal of Physics D: Applied Physics, 2010

ABSTRACT In this study, a plasma electrolytic oxidation (PEO) process was used to produce oxide c... more ABSTRACT In this study, a plasma electrolytic oxidation (PEO) process was used to produce oxide coatings on commercially pure aluminium (1100 alloy) at a pulsed dc power mode. The effects of process parameters (i.e. current density and treatment time) on the plasma discharge behaviour during the PEO treatment were investigated using optical emission spectroscopy (OES) in the visible and near ultraviolet (NUV) band (285–800 nm). The elements present in the plasma were identified. Stark shifts of spectral lines and line intensity ratios were utilized to determine the plasma electron concentrations and temperatures, respectively. The plasma electron temperature profile, coating surface morphology and coating composition were used to interpret the plasma discharging behaviour. The different coating morphologies and compositions at different coating surface regions are explained in terms of three types of discharge, which originate either at the substrate/coating interface, within the upper layer, or at the coating top layer. The high spike peaks on the plasma intensity and temperature profiles corresponded to discharges originated from the substrate/coating interface, while the base line and small fluctuations were due to discharges at the coating/electrolyte interface.

Research paper thumbnail of A Study of Recovery, Recrystallization, Grain Growth and Phase Transformations during the Annealing of Cold-Worked Zircaloy-4

Research paper thumbnail of Corrosion Inhibition of Mild Steel by Polyaromatic Diimine Derivatives: A Theoretical and Experimental Study

Research paper thumbnail of Effect of magnesium content on the stress exponent and internal stress in the steady state creep of Al-Mg alloys

Research paper thumbnail of Stress change tests during the steady state creep of aluminum alloy 3004 at 300°C

Materials Science and Engineering

Research paper thumbnail of Neon ion simulation of neutron induced irradiation growth in zirconium alloys

Journal of Materials Engineering

Research paper thumbnail of Use of Navy C-rings to study and predict distortion in heat treated components: experimental measurements and computer modelling

International Heat Treatment and Surface Engineering

Research paper thumbnail of 321 The Effect of Ferrite Content and Morphology on the Mechanical Properties and Room Temperature Creep of Quenched and Tempered SAE 4340 Steel

The Proceedings of the JSME Materials and Processing Conference (M&P)

Research paper thumbnail of Hydrogen desorption kinetics of a LaNi4.7 Al0.3 metal hydride electrode using potentiostatic measurements

Fuel and Energy Abstracts

Research paper thumbnail of Polytype structures in Zr-Cr-Fe laves phase

Journal of the Less Common Metals

... Phys., 45 (1974) 2313. 29 GC Vayenas and JN Michaels, Surf. Sei., 120 (1982) L405. 30 WE Bell... more ... Phys., 45 (1974) 2313. 29 GC Vayenas and JN Michaels, Surf. Sei., 120 (1982) L405. 30 WE Bell and M. Tagami, J. Phys. Chem., 67 (1963) 2432. 31 M. Hecq and A. Hecq, J. Less-Common Met., 56 (1977) 133. 32 M. Hecq, A. Hecq and T. Robert, J. Vac. Sei. ...

Research paper thumbnail of Mechanical properties of heat affected zone in bainitic high strength low alloy steel

Materials Science and Technology

Research paper thumbnail of Comparison of carbonitriding and nitrocarburising on size and shape distortion of plain carbon SAE 1010 steel

Research paper thumbnail of Calculation of enthalpy of metal hydride formation and prediction of hydrogen site occupancy

Materials Science and Technology

Research paper thumbnail of Synthesis of Ag or Pt Nanoparticles by Hydrolysis of EitherAg2Naor PtNa

Research Letters in Materials Science

Ag and Pt nanoparticles have successfully been synthesized by hydrolysis of eitherAg2Naor PtNa at... more Ag and Pt nanoparticles have successfully been synthesized by hydrolysis of eitherAg2Naor PtNa at room temperature. The oxidation of sodium in the Pt-Na pellets was much faster than that in the Ag-Na pellets since Pt is a catalyst forH2Oformation reaction from hydrogen and oxygen at room temperature. The hydrolysis byproduct, NaOH, has a high solubility and easily is removed. This method offers a simple method of preparing transition metal nanoparticles. The Ag and Pt nanoparticles prepared by this method were crystalline in nature, and spherical in shape with a mean size of around 10 nm.

Research paper thumbnail of The influence of alloying elements on the thermoelectric power of zirconium

Journal of Materials Engineering, 1988

The influence of various alloying elements on the thermoelectric power (TEP) of zirconium is dete... more The influence of various alloying elements on the thermoelectric power (TEP) of zirconium is determined. The data indicate that the thermoelectric power is very sensitive to both the type of alloying element and its solubility in the α-phase of zirconium. For example, where tin strongly reduces the thermoelectric power of zirconium, the magnitude of the reduction increasing as the amount of tin in solution in α-Zr increases, the effect of niobium is much less pronounced and variable with first a decrease and then an increase in TEP with increasing niobium.

Research paper thumbnail of Plasma Electrolytic Oxidation (PEO) coatings on a zirconium alloy for improved wear and corrosion resistance

Tribology and Design, 2010

Research paper thumbnail of Synthesis of Ni Nanoparticles by Hydrolysis of MgNi2

Materials and Manufacturing Processes, Mar 11, 2009

MgNi2 has been shown to exhibit a hydrolysis behavior similar to that previously found for Mg2Ni.... more MgNi2 has been shown to exhibit a hydrolysis behavior similar to that previously found for Mg2Ni. The Ni nanoparticles prepared by hydrolysis of MgNi2 were spherical in shape with a mean diameter of about 16 nm. Utilizing the hydrolysis behavior of MgNi2 to produce Ni nanoparticles offers a higher efficiency than by using Mg2Ni, saves raw material and reduces any pollution resulting from the dissolution of the hydrolysis byproduct (Mg(OH)2) by using an acid.

Research paper thumbnail of ChemInform Abstract: The Hydrolysis Behavior of Mg 2 Ni and Mg 2 NiH 4 in Water or a 6 M KOH Solution and Its Application to Ni Nanoparticles Synthesis

Research paper thumbnail of The Co-Op portfolio: An essential tool for assessment and student development in co-operative engineering programs

Research paper thumbnail of An investigation into polypyrrole-coated 316L stainless steel as a bipolar plate material for PEM fuel cells

Journal of Power Sources, Dec 1, 2006

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