| Summary: | 碩士 === 嘉南藥理大學 === 應用空間資訊系 === 106 === In this present study, the molecular dynamics investigations on solid and hollow spherical copper nanoscale powders during the laser powder bed fusion additive manufacturing (3D printing) process are exhibited under different powder sizes and heating rates. The sizes of copper powders are varied from 12a, 18a and 24a, respectively. The six combinations of both solid and hollow spherical two-powder-model are chosen, respectively. The common neighbor analysis, neck width, mean square displacement, and gyration radius are utilized to investigate the nanoscale physical properties, which are coalescence and melting temperature, of copper powders under laser sintering process.
Whatever solid or hollow spherical copper powders, we found that the solid-state sintering automatically takes place at room temperature. Moreover, except that the powder size and the heating rate of metal powder significantly affect the physical properties, the result of this study also shows that the geometry of the nanoscale powders is also an important role in the 3D printing process.
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