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E. Ohmura
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Proceedings Papers
ITSC 2007, Thermal Spray 2007: Proceedings from the International Thermal Spray Conference, 1035-1040, May 14–16, 2007,
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In order to clarify the effects of two kinds of laser irradiation on plasma sprayed alumina coatings, microstructure, crystallization and mechanical properties of the spacemen were examined and heat conduction in the laser irradiation processes were analyzed by a finite element method. One is CW CO 2 laser irradiation of low power density, and the other is pulse excimer laser irradiation of high intensity but low energy density. Al 2 O 3 coatings were irradiated by CO 2 laser with low intensity, fine structure formation composed of α- Al 2 O 3 was confirmed and the surface roughness was improved although the hardness decreased a little. The modified layer was corresponding to the area that was heated above 1000 to 1100°C in the calculated maximum temperature distribution. It was also confirmed that the excimer laser pulse has a potential to improve the properties of surface layer to a depth of several micrometers.
Proceedings Papers
ITSC 2007, Thermal Spray 2007: Proceedings from the International Thermal Spray Conference, 230-235, May 14–16, 2007,
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Three-dimensional molecular dynamics simulation was conducted to clarify at an atomic level the flattening process of a high-temperature droplet impacting a substrate at high speed. The droplet and the substrate were assumed to consist of pure aluminum, and the Morse potential was postulated between a pair of aluminum atoms. In this report, the influences of the impact parameters, such as the droplet velocity and the droplet diameter on its flattening behavior were analyzed. As a result, following representative conclusions were obtained: (1) the flattening ratio increases in proportion to the droplet velocity and the droplet diameter; (2) the flattening ratio for nanosized droplet can be rearranged by the same dimensionless parameters of the proper physical properties, such as the viscosity and the surface tension, as those used in the macroscopic flattening process.
Proceedings Papers
ITSC 2004, Thermal Spray 2004: Proceedings from the International Thermal Spray Conference, 770-775, May 10–12, 2004,
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In order to clarify the flattening process of the high-temperature and high-speed droplet due to its impact on the substrate in an atomic level, several three-dimensional molecular dynamics simulations were conducted. The droplet and the substrate were assumed to consist of pure aluminum, and Morse potential was postulated between a pair of aluminum atoms. By visualizing the analytical result, the processes of melting and solidification, temperature distribution, deformation velocity and shape of the droplet were clarified. As a result, following conclusions were obtained: (1) The transfer of the droplet atoms to the horizontal direction in flattening process increases in proportion to the horizontal distance from the central axis of the droplet. (2) The solidification of the droplet starts from the outside edge of the droplet, and finishes as the flattening ratio increases. Such solidification behavior is different from the results analyzed with a continuum model on the assumption that the flattening finishes when the half volume of the droplet solidifies.