The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform
Michael G. Kompitsas - One of the best experts on this subject based on the ideXlab platform.
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Laser Energy density, structure and properties of pulsed-Laser deposited zinc oxide films
Applied Surface Science, 2011Co-Authors: M G Tsoutsouva, Christos N. Panagopoulos, Michael G. KompitsasAbstract:Abstract Zinc oxide thin films were deposited on soda lime glass substrates by pulsed Laser deposition in an oxygen-reactive atmosphere at 20 Pa and a constant substrate temperature at 300 °C. A pulsed KrF excimer Laser, operated at 248 nm with pulse duration 10 ns, was used to ablate the ceramic zinc oxide target. The structure, the optical and electrical properties of the as-deposited films were studied in dependence of the Laser Energy density in the 1.2–2.8 J/cm2 range, with the aid of X-ray Diffraction, Atomic Force Microscope, Transmission Spectroscopy techniques, and the Van der Pauw method, respectively. The results indicated that the structural and optical properties of the zinc oxide films were improved by increasing the Laser Energy density of the ablating Laser. The surface roughness of the zinc oxide film increased with the decrease of Laser Energy density and both the optical bang gap and the electrical resistivity of the film were significantly affected by the Laser Energy density.
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Laser Energy density, structure and properties of pulsed-Laser deposited zinc oxide films
Applied Surface Science, 2011Co-Authors: M G Tsoutsouva, Christos N. Panagopoulos, Michael G. KompitsasAbstract:Zinc oxide thin films were deposited on soda lime glass substrates by pulsed Laser deposition in an oxygen-reactive atmosphere at 20 Pa and a constant substrate temperature at 300 degrees C. A pulsed KrF excimer Laser, operated at 248nm with pulse duration 10 ns, was used to ablate the ceramic zinc oxide target. The structure, the optical and electrical properties of the as-deposited films were studied in dependence of the Laser Energy density in the 1.2-2.8J/cm(2) range, with the aid of X-ray Diffraction, Atomic Force Microscope, Transmission Spectroscopy techniques, and the Van der Pauw method, respectively. The results indicated that the structural and optical properties of the zinc oxide films were improved by increasing the Laser Energy density of the ablating Laser. The surface roughness of the zinc oxide film increased with the decrease of Laser Energy density and both the optical bang gap and the electrical resistivity of the film were significantly affected by the Laser Energy density. (C) 2011 Elsevier B. V. All rights reserved
M G Tsoutsouva - One of the best experts on this subject based on the ideXlab platform.
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Laser Energy density, structure and properties of pulsed-Laser deposited zinc oxide films
Applied Surface Science, 2011Co-Authors: M G Tsoutsouva, Christos N. Panagopoulos, Michael G. KompitsasAbstract:Abstract Zinc oxide thin films were deposited on soda lime glass substrates by pulsed Laser deposition in an oxygen-reactive atmosphere at 20 Pa and a constant substrate temperature at 300 °C. A pulsed KrF excimer Laser, operated at 248 nm with pulse duration 10 ns, was used to ablate the ceramic zinc oxide target. The structure, the optical and electrical properties of the as-deposited films were studied in dependence of the Laser Energy density in the 1.2–2.8 J/cm2 range, with the aid of X-ray Diffraction, Atomic Force Microscope, Transmission Spectroscopy techniques, and the Van der Pauw method, respectively. The results indicated that the structural and optical properties of the zinc oxide films were improved by increasing the Laser Energy density of the ablating Laser. The surface roughness of the zinc oxide film increased with the decrease of Laser Energy density and both the optical bang gap and the electrical resistivity of the film were significantly affected by the Laser Energy density.
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Laser Energy density, structure and properties of pulsed-Laser deposited zinc oxide films
Applied Surface Science, 2011Co-Authors: M G Tsoutsouva, Christos N. Panagopoulos, Michael G. KompitsasAbstract:Zinc oxide thin films were deposited on soda lime glass substrates by pulsed Laser deposition in an oxygen-reactive atmosphere at 20 Pa and a constant substrate temperature at 300 degrees C. A pulsed KrF excimer Laser, operated at 248nm with pulse duration 10 ns, was used to ablate the ceramic zinc oxide target. The structure, the optical and electrical properties of the as-deposited films were studied in dependence of the Laser Energy density in the 1.2-2.8J/cm(2) range, with the aid of X-ray Diffraction, Atomic Force Microscope, Transmission Spectroscopy techniques, and the Van der Pauw method, respectively. The results indicated that the structural and optical properties of the zinc oxide films were improved by increasing the Laser Energy density of the ablating Laser. The surface roughness of the zinc oxide film increased with the decrease of Laser Energy density and both the optical bang gap and the electrical resistivity of the film were significantly affected by the Laser Energy density. (C) 2011 Elsevier B. V. All rights reserved
Christos N. Panagopoulos - One of the best experts on this subject based on the ideXlab platform.
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Laser Energy density, structure and properties of pulsed-Laser deposited zinc oxide films
Applied Surface Science, 2011Co-Authors: M G Tsoutsouva, Christos N. Panagopoulos, Michael G. KompitsasAbstract:Abstract Zinc oxide thin films were deposited on soda lime glass substrates by pulsed Laser deposition in an oxygen-reactive atmosphere at 20 Pa and a constant substrate temperature at 300 °C. A pulsed KrF excimer Laser, operated at 248 nm with pulse duration 10 ns, was used to ablate the ceramic zinc oxide target. The structure, the optical and electrical properties of the as-deposited films were studied in dependence of the Laser Energy density in the 1.2–2.8 J/cm2 range, with the aid of X-ray Diffraction, Atomic Force Microscope, Transmission Spectroscopy techniques, and the Van der Pauw method, respectively. The results indicated that the structural and optical properties of the zinc oxide films were improved by increasing the Laser Energy density of the ablating Laser. The surface roughness of the zinc oxide film increased with the decrease of Laser Energy density and both the optical bang gap and the electrical resistivity of the film were significantly affected by the Laser Energy density.
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Laser Energy density, structure and properties of pulsed-Laser deposited zinc oxide films
Applied Surface Science, 2011Co-Authors: M G Tsoutsouva, Christos N. Panagopoulos, Michael G. KompitsasAbstract:Zinc oxide thin films were deposited on soda lime glass substrates by pulsed Laser deposition in an oxygen-reactive atmosphere at 20 Pa and a constant substrate temperature at 300 degrees C. A pulsed KrF excimer Laser, operated at 248nm with pulse duration 10 ns, was used to ablate the ceramic zinc oxide target. The structure, the optical and electrical properties of the as-deposited films were studied in dependence of the Laser Energy density in the 1.2-2.8J/cm(2) range, with the aid of X-ray Diffraction, Atomic Force Microscope, Transmission Spectroscopy techniques, and the Van der Pauw method, respectively. The results indicated that the structural and optical properties of the zinc oxide films were improved by increasing the Laser Energy density of the ablating Laser. The surface roughness of the zinc oxide film increased with the decrease of Laser Energy density and both the optical bang gap and the electrical resistivity of the film were significantly affected by the Laser Energy density. (C) 2011 Elsevier B. V. All rights reserved
Xiaoyan Zeng - One of the best experts on this subject based on the ideXlab platform.
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Microstructure and mechanical property of selective Laser melted Ti6Al4V dependence on Laser Energy density
Rapid Prototyping Journal, 2017Co-Authors: Jie Han, Hanchen Yu, Jie Yin, Ming Gao, Zemin Wang, Jingjing Yang, Xiaoyan ZengAbstract:Purpose This paper aims to investigate the influence of Laser Energy density on microstructure and mechanical properties of the selective Laser melted (SLMed) Ti6Al4V to complement the existing knowledge in additive manufacturing of Ti6Al4V for future application of selective Laser melting (SLM) in fabricating Ti6Al4V parts. Design/methodology/approach Ti6Al4V alloy is fabricated by SLM by adopting various Energy densities. Microstructures and mechanical properties of the Ti6Al4V deposited using different Energy densities are characterized. Findings Both high relative densities and microhardness can be obtained in the optimized processing window. The decrease of martensite width and spacing can improve the microhardness on both XOY and XOZ sections when the applied EV (defined as the Laser Energy per unit volume) increases. The width of the columnar grain increases with EV, resulting in a stronger anisotropy in microhardness between XOY and XOZ sections. Residual tensile stresses exist in the SLMed Ti6Al4V and increase with an increasing EV. A tensile strength of 1,268 MPa, a yield strength of 1,030 MPa, and an elongation of 4% can be obtained by using the optimized range of EV. Originality/value The microstructure of SLMed Ti6Al4V is quantitatively analysed by measuring the size of columnar grains and the martensites. The anisotropy of microstructures and properties in SLMed Ti6Al4V is characterized and its dependence on Laser Energy density is established. The residual stress in SLMed Ti6Al4V is characterized and its dependence on Laser Energy density is established. An optimized processing window to deposit Ti6Al4V alloy by SLM is proposed.
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Study on deposition rate and Laser Energy efficiency of Laser-Induction Hybrid Cladding
Optics & Laser Technology, 2016Co-Authors: Dengzhi Wang, Yong Xie, Zheng Yinlan, Xiaoyan ZengAbstract:Abstract Laser-Induction Hybrid Cladding (LIHC) was introduced to prepare metal silicide based composite coatings, and influence of different factors such as Laser type, Laser power, Laser scan speed and induction preheating temperature on the coating deposition rate and Laser Energy efficiency was studied systematically. Compared with conventional CO 2 Laser cladding, fiber Laser-induction hybrid cladding improves the coating deposition rate and Laser Energy efficiency by 3.7 times. When a fiber Laser with Laser power of 4 kW was combined with an induction preheating temperature of 850 °C, the maximum coating deposition rate and maximum Laser Energy efficiency reaches 71 g/min and 64% respectively.
Jie Han - One of the best experts on this subject based on the ideXlab platform.
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Microstructure and mechanical property of selective Laser melted Ti6Al4V dependence on Laser Energy density
Rapid Prototyping Journal, 2017Co-Authors: Jie Han, Hanchen Yu, Jie Yin, Ming Gao, Zemin Wang, Jingjing Yang, Xiaoyan ZengAbstract:Purpose This paper aims to investigate the influence of Laser Energy density on microstructure and mechanical properties of the selective Laser melted (SLMed) Ti6Al4V to complement the existing knowledge in additive manufacturing of Ti6Al4V for future application of selective Laser melting (SLM) in fabricating Ti6Al4V parts. Design/methodology/approach Ti6Al4V alloy is fabricated by SLM by adopting various Energy densities. Microstructures and mechanical properties of the Ti6Al4V deposited using different Energy densities are characterized. Findings Both high relative densities and microhardness can be obtained in the optimized processing window. The decrease of martensite width and spacing can improve the microhardness on both XOY and XOZ sections when the applied EV (defined as the Laser Energy per unit volume) increases. The width of the columnar grain increases with EV, resulting in a stronger anisotropy in microhardness between XOY and XOZ sections. Residual tensile stresses exist in the SLMed Ti6Al4V and increase with an increasing EV. A tensile strength of 1,268 MPa, a yield strength of 1,030 MPa, and an elongation of 4% can be obtained by using the optimized range of EV. Originality/value The microstructure of SLMed Ti6Al4V is quantitatively analysed by measuring the size of columnar grains and the martensites. The anisotropy of microstructures and properties in SLMed Ti6Al4V is characterized and its dependence on Laser Energy density is established. The residual stress in SLMed Ti6Al4V is characterized and its dependence on Laser Energy density is established. An optimized processing window to deposit Ti6Al4V alloy by SLM is proposed.
