材料科学
溶胶凝胶
胶体二氧化硅
折射率
热膨胀
制作
流变学
墨水池
结晶
表面粗糙度
复合材料
化学工程
纳米技术
涂层
光电子学
医学
替代医学
病理
工程类
作者
Joel F. Destino,Nikola A. Dudukovic,Michael Johnson,Du T. Nguyen,Timothy D. Yee,Garth C. Egan,April M. Sawvel,William A. Steele,Theodore F. Baumann,Eric B. Duoss,Tayyab Suratwala,Rebecca Dylla‐Spears
标识
DOI:10.1002/admt.201700323
摘要
Abstract A method for fabricating optical quality silica and silica–titania glasses by three‐dimensional (3D) printing is reported. Key to this success is the combination of sol–gel derived silica and silica–titania colloidal feedstocks, direct ink writing (DIW) technology, and conventional glass thermal processing methods. Printable silica and silica–titania sol inks are prepared directly from molecular precursors by a simple one‐pot method, which is optimized to yield viscous, shear‐thinning colloidal suspensions with tuned rheology ideal for DIW. After printing, the parts are dried and sintered under optimized thermal conditions to ensure complete organic removal and uniform densification without crystallization. Characterizations of the 3D‐printed pure silica and silica–titania glasses show that they are equivalent to commercial optical fused silica and silica–titania glasses. More specifically, they exhibit comparable chemical composition, SiO 2 network structure, refractive index, dispersion, optical transmission, and coefficient of thermal expansion. 3D‐printed silica and silica–titania glasses also exhibit comparable polished surface roughness and meet refractive index homogeneity standards within range of commercial optical grade glasses. This method establishes 3D printing as a viable tool to create optical glasses with compositional and geometric configurations that are inaccessible by conventional optical fabrication methods.
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