Abstract Direct foam writing allows the fabrication of highly porous and hierarchical ceramic structures with high specific mechanical properties. This manufacturing technique, however, has mainly used stabilized Al2O3 foam inks. In this work, we pressent a novel foam ink based on TiO2. This ink uses polyvinyl alcohol (PVA) as a binder and a small amount of zinc as a frothing agent. We used this ink to produce cylindrical foam samples via direct foam writing. The foams had a porosity of up to 65% and a mean pore size of 180 μm, which is significantly larger than previously reported for direct foam writing with Al2O3. The foams were tested in compression and were found to have an elastic modulus of 0.5 GPa and a compressive strength of 12–18 MPa. These mechanical properties are similar to those of porous ceramics produced by conventional manufacturing routes. Therefore, this work represents a step forward by broadening the direct foam writing process to a wider range of porous ceramics.

中文翻译：

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致密多孔 TiO2 结构的 3D 打印

摘要 直接泡沫书写允许制造具有高比机械性能的高度多孔和分级的陶瓷结构。然而，这种制造技术主要使用稳定的 Al2O3 泡沫油墨。在这项工作中，我们推出了一种基于 TiO2 的新型泡沫油墨。这种墨水使用聚乙烯醇（PVA）作为粘合剂，少量锌作为起泡剂。我们使用这种墨水通过直接泡沫书写来生产圆柱形泡沫样品。泡沫具有高达 65% 的孔隙率和 180 μm 的平均孔径，这明显大于先前报道的用 Al2O3 直接书写泡沫。对泡沫进行了压缩测试，发现其弹性模量为 0.5 GPa，压缩强度为 12-18 MPa。这些机械性能类似于通过传统制造途径生产的多孔陶瓷。因此，这项工作代表了通过将直接泡沫书写过程扩展到更广泛的多孔陶瓷而向前迈出的一步。