Abstract: In this paper, a boehmite gel suitable for direct ink writing was prepared by sol-gel method. Rheological properties of the gel were adjusted by changing the content of boehmite and the content of hydroxyethyl cellulose, the printing properties of the gel were evaluated. Multi-step liquid phase drying method was innovatively proposed to tackle the challenges faced by the drying of gel body. Low molecular weight polyethylene glycol was used as the drying medium and ethyl acetate as the extractant, the gel body with a thickness of 10 mm was dried within 26 h, avoiding the occurrence of drying defects, which is difficult to achieve by the traditional low temperature and high humidity drying method. A dense alumina ceramic part with an average grain size of 1.5 μm, a relative density of 99%, and a bending strength of (351±53) MPa is successfully prepared after normal pressure sintering.
Key words: 3D printing, alumina ceramics, liquid phase drying, boehmite, gel
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