Title : Nanoparticles joining in smart additive manufacturing, design & evaluation
Complicated metal and ceramic components were fabricated by smart additive manufacturing, design and evaluation (Smart MADE). The functional structures were designed by computer graphics and fabricated by stereolithography of 3D printing. Metal and ceramic particles of 3 - 5 µm and 200 - 600 nm in average diameters were dispersed into photosensitive acrylic resin at 50 - 60 % in volume percent. vol. %. The formed paste materials were spread on a substrate by using a mechanical knife edge. An ultraviolet laser beam of 355 nm in wavelength was focused into 50 µm in diameter and scanned to draw cross sectional solid patterns of 50 µm in layer thickness. The laser irradiation power and scanning speed were set at 300 mW and 3000 mm/s, respectively. A composite precursors were obtained successfully thorough continuous laminations. The metal or ceramic components could be created by dewaxing and sintering in the vacuum or air atmosphere, respectively. In this investigation, sound absorption structure with connected spherical cavities of Helmholtz chambers were developed by the Smart MADE. The frequency spectra and sound pressure distributions were plotted and visualized by computational fluid dynamics and acoustic simulation. The high frequency noises generated from high speed gas flames using in thermal spraying and cutting will be controlled and reduced effectively by utilizing the fabricated Helmholtz sonic modulators.