Abstract: A composite dispersant was selected to prepare low-viscosity ceramic slurry, and the thick-walled (>3 mm) SiO2 hollow hexagonal ceramic part was prepared by the self-developed ceramic 3D printer and DLP (digital light processing) process. The accuracy of the green body was all within 50 μm in three dimensional directions. The thermal decomposition process of 3D printing ceramic green bodies in air atmosphere or argon atmosphere was analyzed, and the influence of atmosphere on the degreasing and sintering of thick-walled (>3 mm) SiO2 ceramic parts was analyzed. The process of rapid degreasing and sintering of thick-walled (>3 mm) 3D printing SiO2 ceramic body was analyzed by SEM. The argon atmosphere is conducive to the rapid degreasing and sintering of the thick-walled SiO2 ceramics. The thick-walled (>3 mm) SiO2 ceramic part was prepared rapidly by controlling the gas flow in argon atmosphere. The period of degreasing and sintering is greatly shortened to 21.8 h. Compared with the preparation period of the slurry and its process imported from a foreign company (The preparation period of the company’s slurry and process to prepare the same product is 283 h), it is shortened by 92.3%. And it is more than 82% shorter than the preparation period of the SiO2 ceramic hollow blade prepared by the same process in public reports, which reflects the advantages of 3D printing formless rapid prototyping technology, and has great significance for the practical application of SiO2 ceramic 3D printing technology.
Key words: thick-wall, 3D printing, silica, viscosity, dispersant, sintering
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