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Enhanced 3D printed alumina ceramics via impregnation: Concentration, number of cycles, temperature, and vacuum degree
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DOI：10.1016/j.istruc.2026.112350.png)
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Abstract
En 中文
Because the inherent brittleness of ceramic materials limits the development of alumina ceramics, to improve the mechanical properties of alumina ceramics, this study employed a titanium dioxide sol impregnation method to fill the titanium dioxide sol into the pores inside the alumina ceramics. During sintering, this method can reduce the temperature required for the densification of the alumina ceramics, while also generating a liquid phase that further fills the pores of the alumina ceramics, thereby further increasing the bulk density of the alumina ceramics and enhancing their mechanical properties. In this study, the effects of titanium dioxide sol concentration, impregnation times, impregnation temperature, and impregnation vacuum degree on the mechanical properties of alumina ceramics were investigated. The study found that for alumina ceramics with a solid content of 80 wt%, when impregnated with a 15 wt% titanium dioxide sol at an impregnation temperature of 50 ℃, the best effect was achieved. Compared with the unimpregnated alumina ceramics (97.11 ± 15.60 MPa), the flexural strength increased by a factor of 0.70, reaching 165.31 ± 19.93 MPa, while it also exhibited the highest bulk density (3.40 ± 0.04 g/cm³) and the lowest open porosity (9.11 ± 0.89%). This study establishes a science-based parameter optimization framework for the additive manufacturing of high-performance structural ceramics.
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