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Wayne D. Kaplan - One of the best experts on this subject based on the ideXlab platform.

  • Au–Sapphire (0001) solid–solid interfacial energy
    Journal of Materials Science, 2006
    Co-Authors: Hila Sadan, Wayne D. Kaplan
    Abstract:

    This work presents an experimental methodology for the measurement of interfacial energy (γ_SP) and work of adhesion ( W _ad) of a metal–Ceramic Interface. A thin Au film was dewetted on the basal surface of sapphire substrates to form submicron-sized particles, which were analyzed using the Winterbottom method to determine the equilibrated particle–substrate solid–solid interfacial energy. Electron microscopy showed that a large portion of the particles contained grain boundaries, while all of the single crystalline particles had three distinct morphologies and orientations with the substrate. Two orientation relationships were determined from transmission electron microscopy, for which the interfacial energy in air at 1000 °C was determined: Au (111)–sapphire (0001): γ_SP = 2.15 ± 0.04 J/m^2, W _ad = 0.49 ± 0.04 J/m^2; Au (100)–sapphire (0001): 2.18 ± 0.06 J/m^2, W _ad = 0.55 ± 0.07 J/m^2.

  • au sapphire 0001 solid solid interfacial energy
    Journal of Materials Science, 2006
    Co-Authors: Hila Sadan, Wayne D. Kaplan
    Abstract:

    This work presents an experimental methodology for the measurement of interfacial energy (γSP) and work of adhesion (W ad) of a metal–Ceramic Interface. A thin Au film was dewetted on the basal surface of sapphire substrates to form submicron-sized particles, which were analyzed using the Winterbottom method to determine the equilibrated particle–substrate solid–solid interfacial energy. Electron microscopy showed that a large portion of the particles contained grain boundaries, while all of the single crystalline particles had three distinct morphologies and orientations with the substrate. Two orientation relationships were determined from transmission electron microscopy, for which the interfacial energy in air at 1000 °C was determined: Au (111)–sapphire (0001): γSP = 2.15 ± 0.04 J/m2, W ad = 0.49 ± 0.04 J/m2; Au (100)–sapphire (0001): 2.18 ± 0.06 J/m2, W ad = 0.55 ± 0.07 J/m2.

Hila Sadan - One of the best experts on this subject based on the ideXlab platform.

  • Au–Sapphire (0001) solid–solid interfacial energy
    Journal of Materials Science, 2006
    Co-Authors: Hila Sadan, Wayne D. Kaplan
    Abstract:

    This work presents an experimental methodology for the measurement of interfacial energy (γ_SP) and work of adhesion ( W _ad) of a metal–Ceramic Interface. A thin Au film was dewetted on the basal surface of sapphire substrates to form submicron-sized particles, which were analyzed using the Winterbottom method to determine the equilibrated particle–substrate solid–solid interfacial energy. Electron microscopy showed that a large portion of the particles contained grain boundaries, while all of the single crystalline particles had three distinct morphologies and orientations with the substrate. Two orientation relationships were determined from transmission electron microscopy, for which the interfacial energy in air at 1000 °C was determined: Au (111)–sapphire (0001): γ_SP = 2.15 ± 0.04 J/m^2, W _ad = 0.49 ± 0.04 J/m^2; Au (100)–sapphire (0001): 2.18 ± 0.06 J/m^2, W _ad = 0.55 ± 0.07 J/m^2.

  • au sapphire 0001 solid solid interfacial energy
    Journal of Materials Science, 2006
    Co-Authors: Hila Sadan, Wayne D. Kaplan
    Abstract:

    This work presents an experimental methodology for the measurement of interfacial energy (γSP) and work of adhesion (W ad) of a metal–Ceramic Interface. A thin Au film was dewetted on the basal surface of sapphire substrates to form submicron-sized particles, which were analyzed using the Winterbottom method to determine the equilibrated particle–substrate solid–solid interfacial energy. Electron microscopy showed that a large portion of the particles contained grain boundaries, while all of the single crystalline particles had three distinct morphologies and orientations with the substrate. Two orientation relationships were determined from transmission electron microscopy, for which the interfacial energy in air at 1000 °C was determined: Au (111)–sapphire (0001): γSP = 2.15 ± 0.04 J/m2, W ad = 0.49 ± 0.04 J/m2; Au (100)–sapphire (0001): 2.18 ± 0.06 J/m2, W ad = 0.55 ± 0.07 J/m2.

Lukasz Boron - One of the best experts on this subject based on the ideXlab platform.

  • Effect of Ti, Nb, and Ti + Nb Coatings on the Bond Strength-Structure Relationship in Al/Al_2O_3 Joints
    Journal of Materials Engineering and Performance, 2012
    Co-Authors: Marzanna Ksiazek, Maria Richert, Aam Tchorz, Lukasz Boron
    Abstract:

    There is a growing interest in metal-Ceramic bonding for wide range of applications in electronic devices and high technology industry for fabrication of metal matrix composites and bonding of Ceramic components to metals. The object of the work was to study the effect of Ti, Nb, and Ti + Nb thin films deposited by PVD method on alumina substrates on structure and bond strength properties of Al/Al_2O_3 joints. The joints were fabricated using the results of a wetting experiment and the sessile drop method at a temperature of 1223 K in a vacuum of 0.2 MPa for 30 min of contact. The structure of the metal/Ceramic Interface was investigated using scanning electron microscopy. The elemental distribution at the metal-Ceramic Interface was analyzed using energy dispersive x-ray spectroscopy. Transmission electron microscopy was also used to investigate some aspects of the metal/Ceramic Interface. The bond strength properties of joints were measured using shear test. The shear strength results demonstrated significant improvement of shear strength of Al/Al_2O_3 joints due to the application of Ti + Nb thin film on alumina substrate. Microstructural investigations of the Interface indicated that Al/coating/Al_2O_3 couples have diffusion transition Interface which influences the strengthening of these joints. A conclusion could be drawn that the presence of thin film layers changes the character of interaction and leads to the formation of new reaction products in the bonding layer.

Ganpati Ramanath - One of the best experts on this subject based on the ideXlab platform.

  • interplay between bond breaking and plasticity during fracture at a nanomolecularly modified metal Ceramic Interface
    Scripta Materialia, 2016
    Co-Authors: Matthew Kwan, A. Jain, Michael W. Lane, Muriel Braccini, Ganpati Ramanath
    Abstract:

    Abstract We reveal the roles of moisture and temperature on the interplay between interfacial work of adhesion γa and metal plasticity γp for copper-silica Interfaces modified with an organosilane nanolayer. We find that γp ≠ 0 for Interfaces with metal thicknesses hCu > 12 nm, and increases with hCu before it saturates at hCu ~ 165 nm. For a fixed hCu, γp increases due to temperature-induced yield stress decrease despite a decrease in γa with temperature because of water-induced siloxane bond weakening. These findings should be valuable for understanding the fracture mechanics of, and designing, nanomolecularly-functionalized Interfaces subject to thermomechanical and chemical stresses.

  • Interplay between bond breaking and plasticity during fracture at a nanomolecularly-modified metal-Ceramic Interface
    Scripta Materialia, 2016
    Co-Authors: Matthew Kwan, Michael W. Lane, Muriel Braccini, Ashutosh Jain, Ganpati Ramanath
    Abstract:

    We reveal the roles of moisture and temperature on the interplay between interfacial work of adhesion gamma(a) and metal plasticity gamma(p) for copper-silica Interfaces modified with an organosilane nanolayer. We find that gamma(p) not equal 0 for Interfaces with metal thicknesses h(cu) > 12 nm, and increases with ha, before it saturates at h(cu) similar to 165 nm. For a fixed h(cu), gamma(p) increases due to temperature-induced yield stress decrease despite a decrease in gamma(a) with temperature because of water-induced siloxane bond weakening. These findings should be valuable for understanding the fracture mechanics of, and designing, nanomolecularly-functionalized Interfaces subject to thermomechanical and chemical stresses. (C) 2016 Elsevier B.V. All rights reserved.

  • Atomistic fracture energy partitioning at a metal-Ceramic Interface using a nanomolecular monolayer
    Physical Review B, 2011
    Co-Authors: A. Jain, Binay Singh, Saurabh Garg, N. Ravishankar, Michael W. Lane, Ganpati Ramanath
    Abstract:

    We report an experimental approach to partition the fracture energy of a metal-Ceramic Interface into work of adhesion and plasticity, unveiling the nanomechanics of interfacial deformation and fracture. We obviate crack path uncertainties by constraining fracture to occur in an interfacial nanomolecular layer through fissure of a single bond type whose strength is varied by adjusting the chemical environment. This approach is adaptable for studying interfacial fracture and related phenomena in diverse materials systems in different thermochemical environments.

Tomasz Sadowski - One of the best experts on this subject based on the ideXlab platform.

  • kinked crack at a bi material Ceramic Interface numerical determination of fracture parameters
    Computational Materials Science, 2009
    Co-Authors: Liviu Marsavina, Tomasz Sadowski
    Abstract:

    In the fabrication process of Ceramic composite materials or in service Interface cracks could appear in one of the constituents. This work reports the stress intensity factors solution of a kinked crack whose corner is on the Interface of two bonded dissimilar Ceramic materials subjected to tension parallel to the Interface and to tension normal to the Interface. The finite element method was used to calculate the stress intensity factors at the tips of the crack. The effects of the material properties of the Ceramic composite constituents, the kinked crack length, the Interface crack length, and the kinked angle were investigated. A convergence study was carried out in order to find the proper distance r for collecting the displacement data for the crack flank displacement method. Results for the modulus of the complex stress intensity factors for the bi-material combinations with the homogeneous case, based on Suo and Hutchinson approach show consistent agreement for a range of Interface crack lengths, kinked crack lengths and kinked angles.

  • The Influence of the Interface on Fracture Parameters
    Damage and Fracture Mechanics, 2009
    Co-Authors: Liviu Marsavina, Tomasz Sadowski
    Abstract:

    The presence of cracks has a major impact on the reliability of advanced materials, like fiber or particle reinforced Ceramic composites, and laminated Ceramics. The understanding of the failure mechanisms is very important, as much as the estimation of fracture parameters at the tip of the crack approaching an Interface. This paper presents the numerical results for singularity order, asymptotic stress field and fracture parameters for a crack ending on a bimaterial Ceramic Interface. The effect of bi-axial loading on asymptotic stress field and stress intensity factors was investigated.

  • Kinked crack at a bi-material Ceramic Interface – Numerical determination of fracture parameters
    Computational Materials Science, 2008
    Co-Authors: Liviu Marsavina, Tomasz Sadowski
    Abstract:

    In the fabrication process of Ceramic composite materials or in service Interface cracks could appear in one of the constituents. This work reports the stress intensity factors solution of a kinked crack whose corner is on the Interface of two bonded dissimilar Ceramic materials subjected to tension parallel to the Interface and to tension normal to the Interface. The finite element method was used to calculate the stress intensity factors at the tips of the crack. The effects of the material properties of the Ceramic composite constituents, the kinked crack length, the Interface crack length, and the kinked angle were investigated. A convergence study was carried out in order to find the proper distance r for collecting the displacement data for the crack flank displacement method. Results for the modulus of the complex stress intensity factors for the bi-material combinations with the homogeneous case, based on Suo and Hutchinson approach show consistent agreement for a range of Interface crack lengths, kinked crack lengths and kinked angles.

  • asymptotic stress field at the tip of an inclined crack terminating to an Interface
    Budownictwo i Architektura, 2008
    Co-Authors: Liviu Marsavina, Tomasz Sadowski, M Viteazu
    Abstract:

    This paper presents the numerical results for the asymptotic stress field and the fracture parameters at the tip of an inclined cracks terminating to a bi-material Ceramic Interface. The numerical analysis was carried out using FRANC2D/L fracture analysis code. A biaxial specimen was modeled for produc- ing different mixed mode loads and two materials combinations of Al 2 O 3 and ZrO 2 were considered. The influence of the material combination and applied mixed mode load on the singularity orders, stress distributions and stress intensity factors is highlighted.

  • Effect of Biaxial Load on Crack Deflection/Penetration at Bi-material Ceramic Interface
    International Journal of Fracture, 2007
    Co-Authors: Liviu Marsavina, Tomasz Sadowski
    Abstract:

    The paper investigates the effect of the biaxial loading on crack deflection/penetration at a bi-material Ceramic Interface. A biaxially loaded geometry was numerically investigated using Finite Element Analysis in order to determine the energy release rate. The obtained results could be used in conjunction with a fracture criteria at Interface for estimating the path of the crack after the Interface was reached.