The Experts below are selected from a list of 120 Experts worldwide ranked by ideXlab platform
Sumei Zhao - One of the best experts on this subject based on the ideXlab platform.
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influence of ceramic thickness on residual stress and bonding strength for plasma sprayed duplex thermal barrier coating on aluminum alloy
Surface & Coatings Technology, 2012Co-Authors: Lijian Gu, Ying Wang, Yu Zhao, Sumei ZhaoAbstract:NiCoCrAlY/8wt.%Y2O3–ZrO2 coating was plasma sprayed on aluminum alloy to evaluate the effect of ceramic thickness on residual stress and bonding strength. A new stress calculation method based on Stoney Equation and substrate-removal technique was proposed. Stress in both bond coat and ceramic was studied. With the increase of ceramic thickness, the residual stress in both layers was firstly compressive then turned tensile. The large thermal expansion coefficient of the substrate played an important role in residual stress formation when the ceramic was thin. However, the intrinsic deposition stress took a dominant position when the ceramic coating turned thicker. The bonding strength decreased and the location of the fractured surface moved toward the ceramic surface. The moving of the surface was mainly resulted from the variation of stress gradient and the weakness of high porosity zone near the bond coat–ceramic interface.
Lijian Gu - One of the best experts on this subject based on the ideXlab platform.
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influence of ceramic thickness on residual stress and bonding strength for plasma sprayed duplex thermal barrier coating on aluminum alloy
Surface & Coatings Technology, 2012Co-Authors: Lijian Gu, Ying Wang, Yu Zhao, Sumei ZhaoAbstract:NiCoCrAlY/8wt.%Y2O3–ZrO2 coating was plasma sprayed on aluminum alloy to evaluate the effect of ceramic thickness on residual stress and bonding strength. A new stress calculation method based on Stoney Equation and substrate-removal technique was proposed. Stress in both bond coat and ceramic was studied. With the increase of ceramic thickness, the residual stress in both layers was firstly compressive then turned tensile. The large thermal expansion coefficient of the substrate played an important role in residual stress formation when the ceramic was thin. However, the intrinsic deposition stress took a dominant position when the ceramic coating turned thicker. The bonding strength decreased and the location of the fractured surface moved toward the ceramic surface. The moving of the surface was mainly resulted from the variation of stress gradient and the weakness of high porosity zone near the bond coat–ceramic interface.
Ying Wang - One of the best experts on this subject based on the ideXlab platform.
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influence of ceramic thickness on residual stress and bonding strength for plasma sprayed duplex thermal barrier coating on aluminum alloy
Surface & Coatings Technology, 2012Co-Authors: Lijian Gu, Ying Wang, Yu Zhao, Sumei ZhaoAbstract:NiCoCrAlY/8wt.%Y2O3–ZrO2 coating was plasma sprayed on aluminum alloy to evaluate the effect of ceramic thickness on residual stress and bonding strength. A new stress calculation method based on Stoney Equation and substrate-removal technique was proposed. Stress in both bond coat and ceramic was studied. With the increase of ceramic thickness, the residual stress in both layers was firstly compressive then turned tensile. The large thermal expansion coefficient of the substrate played an important role in residual stress formation when the ceramic was thin. However, the intrinsic deposition stress took a dominant position when the ceramic coating turned thicker. The bonding strength decreased and the location of the fractured surface moved toward the ceramic surface. The moving of the surface was mainly resulted from the variation of stress gradient and the weakness of high porosity zone near the bond coat–ceramic interface.
Yu Zhao - One of the best experts on this subject based on the ideXlab platform.
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influence of ceramic thickness on residual stress and bonding strength for plasma sprayed duplex thermal barrier coating on aluminum alloy
Surface & Coatings Technology, 2012Co-Authors: Lijian Gu, Ying Wang, Yu Zhao, Sumei ZhaoAbstract:NiCoCrAlY/8wt.%Y2O3–ZrO2 coating was plasma sprayed on aluminum alloy to evaluate the effect of ceramic thickness on residual stress and bonding strength. A new stress calculation method based on Stoney Equation and substrate-removal technique was proposed. Stress in both bond coat and ceramic was studied. With the increase of ceramic thickness, the residual stress in both layers was firstly compressive then turned tensile. The large thermal expansion coefficient of the substrate played an important role in residual stress formation when the ceramic was thin. However, the intrinsic deposition stress took a dominant position when the ceramic coating turned thicker. The bonding strength decreased and the location of the fractured surface moved toward the ceramic surface. The moving of the surface was mainly resulted from the variation of stress gradient and the weakness of high porosity zone near the bond coat–ceramic interface.
R A S Zanon - One of the best experts on this subject based on the ideXlab platform.
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enhancing accuracy to Stoney Equation
Applied Surface Science, 2009Co-Authors: Julio Miranda Pureza, Monica De Mesquita Lacerda, A L De Oliveira, Jose Fernando Fragalli, R A S ZanonAbstract:Abstract This paper proposes a three-dimensional system for modelling stress in thin films deposited on plane substrates much thicker than the film itself. The approach is the minimization of the deformation energy of the sample (substrate + film), considering the deformed substrate as a small spherical surface with large curvature radius. Results of the model show the validity limits of the well-established Stoney Equation that satisfy the upper theoretical limit of Poisson ratio ( ν ) for isotropic materials. Our main result is that the stress values obtained in general literature using Stoney Equation are underestimated when considering a typical Poisson ratio for substrates in the range of 0.25 ≤ ν s ≤ 0.4.