Hierarchical cellular ceramics have attracted considerable interest due to their versatility and unique physico-mechanical effectiveness for advanced applications. Tailorable alumina foams with low shrinkage were fabricated through an innovative combination of 3D printing and sacrificial templating with low environmental footprint. The viscoelastic pastes were formulated using the aqueous-based solution of binder, dispersant, and plasticizer with different volumes of α-alumina and lightweight hollow microspheres (HMs) as a template. The solid-to-liquid ratio increased 53–80 vol% with the inclusion of HMs for printable rheology. Cellular architectures of alumina were structured through a material extrusion-based technique and then thermally treated at 1200 °C. Finally, the alumina monoliths achieved a ∼55–93 % porosity with three different types of adjustable pores, produced by combining 3D printing, burning of templates, and inter-particle voids. The HMs generated spherical pores (7–47 µm) in the printing struts with reduced CO emissions compared to conventional sacrificial porogens during the burnout process.

中文翻译：

---

通过基于挤出的 3D 打印使用空心微球开发可调多孔氧化铝整体料


分层多孔陶瓷由于其多功能性和独特的物理机械效能而引起了人们极大的兴趣，适用于先进的应用。通过 3D 打印和牺牲模板的创新组合，制造出低收缩率的可定制氧化铝泡沫，对环境影响较小。使用粘合剂、分散剂和增塑剂的水基溶液以及不同体积的α-氧化铝和轻质空心微球（HM）作为模板配制粘弹性糊剂。由于添加了用于可打印流变学的 HM，固液比增加了 53–80vol%。氧化铝的蜂窝结构通过基于材料挤压的技术构建，然后在 1200°C 下进行热处理。最后，通过结合 3D 打印、模板燃烧和颗粒间空隙，氧化铝整体实现了~55-93% 的孔隙率，具有三种不同类型的可调节孔隙。 HMs 在打印支柱中产生球形孔（7-47μm），与传统的牺牲成孔剂相比，在烧毁过程中二氧化碳排放量减少。