| 總結: | The sintering process can improve the microstructure of Al<sub>2</sub>O<sub>3</sub> composite ceramics and enhance their comprehensive properties, but the effects of the sintering process on Al<sub>2</sub>O<sub>3</sub> composite ceramics are still unclear. Herein, a novel Al<sub>2</sub>O<sub>3</sub> composite ceramic was printed using the material extrusion and photo-polymerization combined process, and the final ceramic was obtained using one-step sintering (TS) and two-step sintering technology (TSS). Based on the testing results, such as the relative density (D<sub>rel</sub>), average grain size (AGS), hardness, bending strength, and fracture toughness, TSS was suitable for the refinement of commercial Al<sub>2</sub>O<sub>3</sub> ceramics. Moreover, the highest sintering temperature of the second step (T<sub>2</sub>) was at 1550 °C, while that of the shortest holding time (t) was at 4 h (TSS<sub>8</sub>), which was to ensure densification before rapid grain growth. The D<sub>rel</sub> and AGS of the best ceramics obtained via TSS<sub>8</sub> were 97.65% and 1.52 µm, respectively. Their hardness, bending strength, and fracture toughness were also enhanced, and they were affected by T<sub>2</sub>, t, and the interaction. In sum, the TSS obtained better fracture toughness and bending strength, which had great potential in the application of the additive manufacturing field.
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