断面積が傾斜した微細流路を有する熱音響変換器の光造形

抄録

Thermoacoustic converters with channels bundle structures were fabricated by using stereolithographic additive manufacturing. Thermodynamic expansions and contractions caused by acoustic vibrations can realize effective heat exchanges between gaseous phases and solid walls. Alumina fine particles were dispersed into photo sensitive acrylic resin to create high viscosity pastes for a lamination processing. Ultraviolet laser beam was scanned on the spread paste surface to form a cross sectional pattern. Through the layer stacking, solid component according to solid design was processed. Obtained precursors were dewaxed and sintered in the air atmosphere. In the ceramic components, part accuracies and fine microstructures were measured and observed by digital optical microscopy and scanning electron microscopy. The hexagonal fluid channels with graded aperture sizes were designed and manufactured by using computer aided systems to increase the thermoacoustic conversion efficiencies.