Magnesium oxide ceramic ink for 3D direct writing molding and preparation method thereof

Abstract

The invention discloses a magnesium oxide ceramic ink for 3D direct writing molding and a preparation method thereof. The ceramic ink is obtained by mixing 57-70wt% of magnesium oxide powder, 2.5-10wt% of polyvinyl alcohol and 25-35wt% of deionized water evenly. The method includes: loading magnesium oxide ceramic ink into a syringe of a direct writing 3D printer, setting the printing program andstarting layer-by-layer printing, drying the printed three-dimensional structure to obtain a magnesium oxide green body, and finally conducting sintering at 1580-1680DEG C in an ordinary sintering furnace to obtain magnesium oxide ceramic. The above scheme achieves simple ink components, high solid content and good fluidity, the preparation method is simple and feasible, the silk thread extruded on the direct writing 3D printer has a smooth surface, the molded green body and the high temperature sintered ceramic have good shape preservation performance, and can be applied to the high temperature field, thus having high practical value and promotion value.

Description

technical field [0001] The invention belongs to the technical field of 3D printing materials, and in particular relates to a magnesia ceramic ink for 3D direct writing molding and a preparation method thereof. Background technique [0002] The principle of 3D direct writing technology is to control the movement of the barrel containing the "ink" in three-dimensional space, extrude the "ink" material in fluid, molten, colloidal or pasty state through pressure, and form it after layer-by-layer accumulation. different shapes to complete the 3D printing process. The 3D structure formed by direct writing has a large aspect ratio and size control range, and can form complex 3D structures with spans. Therefore, this method has attracted extensive attention in advanced ceramic materials, composite materials, and biological tissue scaffolds. [0003] 3D direct writing printing ink needs to be extruded from fine nozzles without clogging, and can quickly solidify into filaments with a...

AI Technical Summary

Problems solved by technology

Compared with organic matter, ceramics are brittle materials and it is difficult to control the fluidity of ceramic inks

Chinese Patent Publication No. CN107651963A discloses a direct-writing molding method of precursor-converted ceramics, which uses ceramic precursors dissolved in organic solvents to prepare slurry, so that the rheological properties of the slurry can be controlled by the amount of organic solvent added, but The approach is limited to material systems with organic polymer ceramic precursors

Due to the easy hydration of magnesium oxide, it is usually difficult to prepare a slurry with a solid content of more than 60wt%, and it is even more challenging to prepare a high-solid ink with good fluidity

Chinese Patent Publication No. CN108456457A discloses a 3D direct writing zirconia ceramic ink, through the addition of ammonium chloride, zinc acetate, sodium chloride and other salt substances, the viscosity of the ink is still very low when the solid content is high; It is difficult to burn off during subsequent sintering, and the formed low-melting eutectic will significantly reduce the high-temperature performance of ceramic products. This method cannot be applied to high-temperature structural ceramics such as magnesium oxide

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