In this study, slip casting and microwave hybrid sintering of Al₂O₃ bimodal powder mixtures were conducted to observe the effect on packing factor and densification behavior of different compositions. The powder mixtures contained up to 50 vol% fine particles. It was found that the green density increased remarkably with the addition of fine particles into coarse ones, and the composition having 30 vol% fine particles had the highest relative density of 72.7%. A similar behavior was also observed in sintered samples, where the sintered densities were also higher for bimodal compositions. Moreover, 3D modeling of the system was carried out, and the sintering behavior was simulated and compared with the experimental data. It was shown that with the same relative green density of 50% solid volume for all samples, the composition with 40 vol% fine particles exhibited the highest relative sintered density of 92.1%. The sintering behavior was also predicted for highly dense modeled structures, which could not be obtained experimentally, and pore analysis was performed. It was observed that the closed porosity increased with the addition of fine particles, while the pore size distribution significantly reduced, where 81.4 vol% pores had pore sizes of only up to 0.28 μm.

在本研究中，Al ₂ O _{3 的}粉浆浇铸和微波混合烧结进行双峰粉末混合物以观察对不同组合物的堆积因子和致密化行为的影响。粉末混合物含有高达 50 体积％的细颗粒。发现随着细颗粒加入粗颗粒，生坯密度显着增加，并且具有30体积％细颗粒的组合物具有最高的72.7％的相对密度。在烧结样品中也观察到类似的行为，其中双峰组合物的烧结密度也更高。此外，对该系统进行了 3D 建模，并对烧结行为进行了模拟并与实验数据进行了比较。结果表明，对于所有样品，在 50% 固体体积的相同相对生坯密度下，具有 40% 体积细颗粒的组合物表现出最高的相对烧结密度，为 92.1%。还预测了无法通过实验获得的高密度模型结构的烧结行为，并进行了孔隙分析。观察到封闭孔隙率随着细颗粒的加入而增加，而孔径分布显着减小，其中 81.4 vol% 的孔隙的孔径仅为 0.28 μm。