Abstract
Three dimensional (3D) printing technology by direct ink writing (DIW) is an innovative complex shaping technology, possessing advantages of flexibility in fabrication, high efficiency, low cost, and environmental-friendliness. Herein, 3D printing of complex alumina ceramic parts via DIW using thermally induced solidification with carrageenan swelling was investigated. The rheological properties of the slurry under different thermally-induced modes were systematically studied. The solidification properties of thermally-induced pastes with varying contents of carrageenan were optimized. The experimental results showed that the optimized paste consisting of 0.4 wt% carrageenan could be rapidly solidified at about 55 °C, which could print inclined-plane more than 60° in vertical without support, resulting in better homogeneity of the green body. A nearly pore-free structure was obtained after sintering at 1600 °C for 2 h.
Highlights
Three dimensional (3D) printing by direct ink writing (DIW) is a new method for materials fabrication that allows designing and rapidly fabricating materials with complex 3D shapes
Primary 3D printing processing techniques for inclined-plane ceramic shaping generally employ laser, binder, gels, ultraviolet (UV) or visible curable resins to retain the inclined-shape while printing green parts [16,17], such as stereolithography (SLA) [18,19], selective laser sintering (SLS), gel-printing [20,21,22], and binder jetting
It might be concluded that carrageenan following complete dissolution in the paste could later almost entirely disentangle with the increase of temperature from 55 to 60 °C causing rapid decline in the viscosity of the slurry; the further slight decrease in viscosity in the temperature range of 60–85 °C was ascribed to Brownian motion intensified
Summary
Three dimensional (3D) printing by direct ink writing (DIW) is a new method for materials fabrication that allows designing and rapidly fabricating materials with complex 3D shapes. Extruded paste needs to have high support strength for printing thin-walled ceramic parts with large inclination. The thermally-induced solidification with carrageenan for ceramic paste 3D printing was adopted.
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