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Arvind Agarwal - One of the best experts on this subject based on the ideXlab platform.

  • Effect of 2D WS 2 Addition on Cold-Sprayed Aluminum Coating
    Journal of Thermal Spray Technology, 2017
    Co-Authors: Archana Loganathan, Sara Rengifo, Alexander Franco Hernandez, Yusuf Emirov, Jeganathan Karthikeyan, Benjamin Boesl, Cheng Zhang, Arvind Agarwal
    Abstract:

    Tungsten disulfide (WS2) has excellent solid lubrication properties due to its 2D layered structure. This study focuses on depositing Al-2 wt.% WS2 composite Coating by cold spray technique. The effect of WS2 addition on the microstructure, mechanical and tribological properties of the composite Coatings is examined in the as-deposited and heat-treated conditions. After heat treatment, the Coating density increased to 99% with improved intersplat bonding. The microhardness of the heat-treated Al-2 wt.% WS2 Coating increased by 56% as compared to the as-sprayed Coating. The wear resistance of heat-treated Al-2 wt.% WS2 Coating improved by 75% with a synergistic reduction in the coefficient of friction (COF) by 51%. Transmission electron microscopy investigation reveals the presence of layered WS2 within Aluminum splats with a strong interface. This study shows that cold spraying can be effectively used to integrate 2D layered WS2 as a solid lubricant in the metallic Coatings.

  • Microstructure and wear properties of Aluminum/Aluminum–silicon composite Coatings prepared by cold spraying
    Surface & Coatings Technology, 2009
    Co-Authors: Srinivasa Rao Bakshi, Timothy Price, Deen Zhang, Anup Kumar Keshri, D. Graham Mccartney, Yao Chen, Philip H. Shipway, Di Wang, Arvind Agarwal
    Abstract:

    Abstract Composite Coatings containing Aluminum and Aluminum–11.6 wt.% silicon eutectic alloy phases of varying compositions were fabricated using cold spraying. Coating contained a uniform distribution of the two phases. The hardness of the Coatings increased as the volume fraction of Al–Si in the Coating increased. The length to width ratio of the splats was found to be larger for Al particles compared to Al–Si particles. Dry sliding ball-on-plate wear tests indicated that the wear volume loss was similar for the Al and Al/Al–Si composite Coatings in spite of the increase in microhardness. This discrepancy is explained by the inter-splat delamination mechanism. The coefficient of friction of Aluminum Coating reduced on Al–Si addition.

  • Microstructure and wear properties of Aluminum/Aluminum-silicon composite Coatings prepared by cold spraying
    Surface and Coatings Technology, 2009
    Co-Authors: Srinivasa Rao Bakshi, Timothy Price, Deen Zhang, Anup Kumar Keshri, D. Graham Mccartney, Yao Chen, Philip H. Shipway, Di Wang, Arvind Agarwal
    Abstract:

    Composite Coatings containing Aluminum and Aluminum-11.6 wt.% silicon eutectic alloy phases of varying compositions were fabricated using cold spraying. Coating contained a uniform distribution of the two phases. The hardness of the Coatings increased as the volume fraction of Al-Si in the Coating increased. The length to width ratio of the splats was found to be larger for Al particles compared to Al-Si particles. Dry sliding ball-on-plate wear tests indicated that the wear volume loss was similar for the Al and Al/Al-Si composite Coatings in spite of the increase in microhardness. This discrepancy is explained by the inter-splat delamination mechanism. The coefficient of friction of Aluminum Coating reduced on Al-Si addition. © 2009 Elsevier B.V. All rights reserved.

  • Transmission electron microscopy of cold sprayed 1100 Aluminum Coating
    Scripta Materialia, 2005
    Co-Authors: Kantesh Balani, Arvind Agarwal, Sudipta Seal, Jeganathan Karthikeyan
    Abstract:

    Cold-spraying of 1100 Al powder particles onto 1100 Al substrate was accomplished using carrier gases 100 vol.% He and a mixture of He–20 vol.% N2. TEM characterization correlates very well the occurrence of dislocations, presence of oxide, and surface instability phenomenon with observed mechanical and corrosion properties of the cold-sprayed Coating.

  • effect of carrier gases on microstructural and electrochemical behavior of cold sprayed 1100 Aluminum Coating
    Surface & Coatings Technology, 2005
    Co-Authors: Kantesh Balani, Jeganathan Karthikeyan, Thewarach Laha, Arvind Agarwal, Norman Munroe
    Abstract:

    Aluminum has been cold sprayed onto similar substrate using 100 vol.% He and mixture of He-20 vol.% N2 as carrier gases. Analysis and characterization of sprayed depositions under different processing conditions was performed through optical micrography, stereological analysis, scanning electron microscopy, and microhardness depth profiles. Potentiodynamic polarization curves and Tafel extrapolation experiments were carried at 0.9 pH value using sulfuric acid (H2SO4) as an electrolyte. Helium processing condition displayed more compact structure and higher hardness for the Coating when compared to He-20 vol.% N2 processing. Electrochemical studies depicted better corrosion resistance of the He-20 vol.% N2-processed Coatings when compared to Coatings processed with helium alone. D 2004 Elsevier B.V. All rights reserved.

Jeganathan Karthikeyan - One of the best experts on this subject based on the ideXlab platform.

  • Effect of 2D WS 2 Addition on Cold-Sprayed Aluminum Coating
    Journal of Thermal Spray Technology, 2017
    Co-Authors: Archana Loganathan, Sara Rengifo, Alexander Franco Hernandez, Yusuf Emirov, Jeganathan Karthikeyan, Benjamin Boesl, Cheng Zhang, Arvind Agarwal
    Abstract:

    Tungsten disulfide (WS2) has excellent solid lubrication properties due to its 2D layered structure. This study focuses on depositing Al-2 wt.% WS2 composite Coating by cold spray technique. The effect of WS2 addition on the microstructure, mechanical and tribological properties of the composite Coatings is examined in the as-deposited and heat-treated conditions. After heat treatment, the Coating density increased to 99% with improved intersplat bonding. The microhardness of the heat-treated Al-2 wt.% WS2 Coating increased by 56% as compared to the as-sprayed Coating. The wear resistance of heat-treated Al-2 wt.% WS2 Coating improved by 75% with a synergistic reduction in the coefficient of friction (COF) by 51%. Transmission electron microscopy investigation reveals the presence of layered WS2 within Aluminum splats with a strong interface. This study shows that cold spraying can be effectively used to integrate 2D layered WS2 as a solid lubricant in the metallic Coatings.

  • Transmission electron microscopy of cold sprayed 1100 Aluminum Coating
    Scripta Materialia, 2005
    Co-Authors: Kantesh Balani, Arvind Agarwal, Sudipta Seal, Jeganathan Karthikeyan
    Abstract:

    Cold-spraying of 1100 Al powder particles onto 1100 Al substrate was accomplished using carrier gases 100 vol.% He and a mixture of He–20 vol.% N2. TEM characterization correlates very well the occurrence of dislocations, presence of oxide, and surface instability phenomenon with observed mechanical and corrosion properties of the cold-sprayed Coating.

  • effect of carrier gases on microstructural and electrochemical behavior of cold sprayed 1100 Aluminum Coating
    Surface & Coatings Technology, 2005
    Co-Authors: Kantesh Balani, Jeganathan Karthikeyan, Thewarach Laha, Arvind Agarwal, Norman Munroe
    Abstract:

    Aluminum has been cold sprayed onto similar substrate using 100 vol.% He and mixture of He-20 vol.% N2 as carrier gases. Analysis and characterization of sprayed depositions under different processing conditions was performed through optical micrography, stereological analysis, scanning electron microscopy, and microhardness depth profiles. Potentiodynamic polarization curves and Tafel extrapolation experiments were carried at 0.9 pH value using sulfuric acid (H2SO4) as an electrolyte. Helium processing condition displayed more compact structure and higher hardness for the Coating when compared to He-20 vol.% N2 processing. Electrochemical studies depicted better corrosion resistance of the He-20 vol.% N2-processed Coatings when compared to Coatings processed with helium alone. D 2004 Elsevier B.V. All rights reserved.

  • Transmission electron microscopy of cold sprayed 1100 Aluminum Coating
    Scripta Materialia, 2005
    Co-Authors: Kantesh Balani, Arvind Agarwal, Sudipta Seal, Jeganathan Karthikeyan
    Abstract:

    Cold-spraying of 1100 Al powder particles onto 1100 Al substrate was accomplished using carrier gases 100 vol.% He and a mixture of He-20 vol.% N2. TEM characterization correlates very well the occurrence of dislocations, presence of oxide, and surface instability phenomenon with observed mechanical and corrosion properties of the cold-sprayed Coating. ?? 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

  • Microstructural and electrochemical characterization of cold-sprayed 1100 Aluminum Coating
    ITSC 2004: International Thermal Spray Conference 2004: Advances in Technology and Application, 2004
    Co-Authors: Jeganathan Karthikeyan, Thewarach Laha, Kantesh Balani, Arvind Agarwal, Norman Munroe
    Abstract:

    Cold spray is an effective technique to deposit pure metallic Coatings on a variety of substrates. 1100 series Aluminum-based Coating has been deposited on similar Aluminum substrate by cold spray technique using helium and a mixture of helium and nitrogen as powder carrying gases. The microstructural features of the Coating were analyzed using optical micrography, Scanning Electron Microscopy (SEM) and Microhardness depth profiles. The electrochemical behavior of the materials was studied using 0.5 N H2SO4 as electrolyte. Tafel extrapolation experiments were carried out in order to calculate the corrosion rate, corrosion potential and the Tafel slopes, whereas, potentiodynamic polarization experiments were performed to understand the passivation behavior of the material under the experimental conditions. The electrochemical studies validate the use of cold sprayed Aluminum Coating for corrosion protection applications. SEM characterization of the Coatings was also performed after the electrochemical experiments.

Kantesh Balani - One of the best experts on this subject based on the ideXlab platform.

  • Transmission electron microscopy of cold sprayed 1100 Aluminum Coating
    Scripta Materialia, 2005
    Co-Authors: Kantesh Balani, Arvind Agarwal, Sudipta Seal, Jeganathan Karthikeyan
    Abstract:

    Cold-spraying of 1100 Al powder particles onto 1100 Al substrate was accomplished using carrier gases 100 vol.% He and a mixture of He–20 vol.% N2. TEM characterization correlates very well the occurrence of dislocations, presence of oxide, and surface instability phenomenon with observed mechanical and corrosion properties of the cold-sprayed Coating.

  • effect of carrier gases on microstructural and electrochemical behavior of cold sprayed 1100 Aluminum Coating
    Surface & Coatings Technology, 2005
    Co-Authors: Kantesh Balani, Jeganathan Karthikeyan, Thewarach Laha, Arvind Agarwal, Norman Munroe
    Abstract:

    Aluminum has been cold sprayed onto similar substrate using 100 vol.% He and mixture of He-20 vol.% N2 as carrier gases. Analysis and characterization of sprayed depositions under different processing conditions was performed through optical micrography, stereological analysis, scanning electron microscopy, and microhardness depth profiles. Potentiodynamic polarization curves and Tafel extrapolation experiments were carried at 0.9 pH value using sulfuric acid (H2SO4) as an electrolyte. Helium processing condition displayed more compact structure and higher hardness for the Coating when compared to He-20 vol.% N2 processing. Electrochemical studies depicted better corrosion resistance of the He-20 vol.% N2-processed Coatings when compared to Coatings processed with helium alone. D 2004 Elsevier B.V. All rights reserved.

  • Transmission electron microscopy of cold sprayed 1100 Aluminum Coating
    Scripta Materialia, 2005
    Co-Authors: Kantesh Balani, Arvind Agarwal, Sudipta Seal, Jeganathan Karthikeyan
    Abstract:

    Cold-spraying of 1100 Al powder particles onto 1100 Al substrate was accomplished using carrier gases 100 vol.% He and a mixture of He-20 vol.% N2. TEM characterization correlates very well the occurrence of dislocations, presence of oxide, and surface instability phenomenon with observed mechanical and corrosion properties of the cold-sprayed Coating. ?? 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

  • Microstructural and electrochemical characterization of cold-sprayed 1100 Aluminum Coating
    ITSC 2004: International Thermal Spray Conference 2004: Advances in Technology and Application, 2004
    Co-Authors: Jeganathan Karthikeyan, Thewarach Laha, Kantesh Balani, Arvind Agarwal, Norman Munroe
    Abstract:

    Cold spray is an effective technique to deposit pure metallic Coatings on a variety of substrates. 1100 series Aluminum-based Coating has been deposited on similar Aluminum substrate by cold spray technique using helium and a mixture of helium and nitrogen as powder carrying gases. The microstructural features of the Coating were analyzed using optical micrography, Scanning Electron Microscopy (SEM) and Microhardness depth profiles. The electrochemical behavior of the materials was studied using 0.5 N H2SO4 as electrolyte. Tafel extrapolation experiments were carried out in order to calculate the corrosion rate, corrosion potential and the Tafel slopes, whereas, potentiodynamic polarization experiments were performed to understand the passivation behavior of the material under the experimental conditions. The electrochemical studies validate the use of cold sprayed Aluminum Coating for corrosion protection applications. SEM characterization of the Coatings was also performed after the electrochemical experiments.

Jitendra Singh - One of the best experts on this subject based on the ideXlab platform.

  • pore blocking characteristics of corrosion products formed on Aluminum Coating produced by arc thermal metal spray process in 3 5 wt nacl solution
    Construction and Building Materials, 2016
    Co-Authors: Jitendra Singh, Jang Hyun Park
    Abstract:

    Abstract Arc thermal metal spray Coating is very efficient process to protect the steel from corrosion in industrial, humid and saline/coastal environments. This paper incorporates the experimental results for the performance of Aluminum Coating deposited on mild steel substrate by arc thermal metal spray. Different electrochemical techniques, FE-SEM, Raman spectroscopy and XRD were used to assess the performance of deposited Coating. Electrochemical studies revealed the enhanced corrosion resistance properties of Coating in 3.5 wt.% NaCl solution. The formation of α-Al(OH)3 on Coating substrate during exposure periods block the pores of Coating and impede the penetration of corrosive species to react with substrate.

  • corrosion resistance properties of Aluminum Coating applied by arc thermal metal spray in sae j2334 solution with exposure periods
    Metals, 2016
    Co-Authors: Jitendra Singh, Mohamed A Ismail, Chinmoy Bhattacharya
    Abstract:

    Arc thermal metal spray Coating provides excellent corrosion, erosion and wear resistance to steel substrates. This paper incorporates some results of Aluminum Coating applied by this method on plain carbon steel. Thereafter, coated panels were exposed to an environment known to form stable corrosion products with Aluminum. The coated panels were immersed in Society of Automotive Engineers (SAE) J2334 for different periods of time. This solution consists of an aqueous solution of NaCl, CaCl2 and NaHCO3. Various electrochemical techniques, i.e., corrosion potential-time, electrochemical impedance spectroscopy (EIS) and the potentiodynamic were used to determine the performance of stimulants in improving the properties of the Coating. EIS studies revealed the kinetics and mechanism of corrosion and potentiodynamic attributed the formation of a passive film, which stifles the penetration of aggressive ions towards the substrate. The corrosion products that formed on the Coating surface, identified using Raman spectroscopy, were Dawsonite (NaAlCO3(OH)2) and Al(OH)3. These compounds of Aluminum are very sparingly soluble in aqueous solution and protect the substrate from pitting and uniform corrosion. The morphology and composition of corrosion products determined by scanning electron microscopy and energy dispersive X-ray analyses indicated that the environment plays a decisive role in improving the corrosion resistance of Aluminum Coating.

  • Corrosion Resistance Properties of Aluminum Coating Applied by Arc Thermal Metal Spray in SAE J2334 Solution with Exposure Periods
    Metals, 2016
    Co-Authors: Han Seung Lee, Jitendra Singh, Mohamed Ismail, Chinmoy Bhattacharya
    Abstract:

    © 2016 by the authors; licensee MDPI, Basel, SwitzerlandArc thermal metal spray Coating provides excellent corrosion, erosion and wear resistance to steel substrates. This paper incorporates some results of Aluminum Coating applied by this method on plain carbon steel. Thereafter, coated panels were exposed to an environment known to form stable corrosion products with Aluminum. The coated panels were immersed in Society of Automotive Engineers (SAE) J2334 for different periods of time. This solution consists of an aqueous solution of NaCl, CaCl2 and NaHCO3. Various electrochemical techniques, i.e., corrosion potential-time, electrochemical impedance spectroscopy (EIS) and the potentiodynamic were used to determine the performance of stimulants in improving the properties of the Coating. EIS studies revealed the kinetics and mechanism of corrosion and potentiodynamic attributed the formation of a passive film, which stifles the penetration of aggressive ions towards the substrate. The corrosion products that formed on the Coating surface, identified using Raman spectroscopy, were Dawsonite (NaAlCO3(OH)2) and Al(OH)3. These compounds of Aluminum are very sparingly soluble in aqueous solution and protect the substrate from pitting and uniform corrosion. The morphology and composition of corrosion products determined by scanning electron microscopy and energy dispersive X-ray analyses indicated that the environment plays a decisive role in improving the corrosion resistance of Aluminum Coating.

I.h.a. Fattah - One of the best experts on this subject based on the ideXlab platform.

  • Narrow-beam Aluminum-mirrored fiber optical-taps with controllable tapped power
    IEEE Journal of Selected Topics in Quantum Electronics, 1996
    Co-Authors: N.m. Ibrahim, I.h.a. Fattah
    Abstract:

    A fiber optical-tap has been fabricated and tested. Two separate fiber tips were polished with an angle of 45/spl deg/, and one of the tips was coated with Aluminum inside a vacuum deposition unit. Then, the coated and uncoated polished tips were spliced together using a fusion splicer to form a fiber optical-tap. The power of the tapped light is controllable by controlling the thickness of the Aluminum Coating during vacuum deposition. As the Aluminum Coating thickness increases, the amount of tapped light increases and consequently the power transmitted after the fiber optical-tap decreases. For the same Aluminum Coating thickness, the tapped beam power from a single-mode fiber tap is higher than that from a multimode fiber tap. In addition to the feasibility of tapping a narrow light beam and controlling its power, the fabricated optical tap has a short length, which means that it can be integrated easily in optical signal-processing circuits. The mechanical strength of the tap has been tested in the laboratory and found to be capable of supporting between 75 and 180 g before breaking.