| Autor: |
Sasan K; Lawrence Livermore National Laboratory , Livermore , California 94550 , United States., Lange A; Lawrence Livermore National Laboratory , Livermore , California 94550 , United States., Yee TD; Lawrence Livermore National Laboratory , Livermore , California 94550 , United States., Dudukovic N; Lawrence Livermore National Laboratory , Livermore , California 94550 , United States., Nguyen DT; Lawrence Livermore National Laboratory , Livermore , California 94550 , United States., Johnson MA; Lawrence Livermore National Laboratory , Livermore , California 94550 , United States., Herrera OD; Lawrence Livermore National Laboratory , Livermore , California 94550 , United States., Yoo JH; Lawrence Livermore National Laboratory , Livermore , California 94550 , United States., Sawvel AM; Lawrence Livermore National Laboratory , Livermore , California 94550 , United States., Ellis ME; Lawrence Livermore National Laboratory , Livermore , California 94550 , United States., Mah CM; Lawrence Livermore National Laboratory , Livermore , California 94550 , United States., Ryerson R; Lawrence Livermore National Laboratory , Livermore , California 94550 , United States., Wong LL; Lawrence Livermore National Laboratory , Livermore , California 94550 , United States., Suratwala T; Lawrence Livermore National Laboratory , Livermore , California 94550 , United States., Destino JF; Creighton University , Omaha , Nebraska 68178 , United States., Dylla-Spears R; Lawrence Livermore National Laboratory , Livermore , California 94550 , United States. |
| Abstrakt: |
Direct ink writing (DIW) three-dimensional (3D) printing provides a revolutionary approach to fabricating components with gradients in material properties. Herein, we report a method for generating colloidal germania feedstock and germania-silica inks for the production of optical quality germania-silica (GeO 2 -SiO 2 ) glasses by DIW, making available a new material composition for the development of multimaterial and functionally graded optical quality glasses and ceramics by additive manufacturing. Colloidal germania and silica particles are prepared by a base-catalyzed sol-gel method and converted to printable shear-thinning suspensions with desired viscoelastic properties for DIW. The volatile solvents are then evaporated, and the green bodies are calcined and sintered to produce transparent, crack-free glasses. Chemical and structural evolution of GeO 2 -SiO 2 glasses is confirmed by nuclear magnetic resonance, X-ray diffraction, and Raman spectroscopy. UV-vis transmission and optical homogeneity measurements reveal comparable performance of the 3D printed GeO 2 -SiO 2 glasses to glasses produced using conventional approaches and improved performance over 3D printed TiO 2 -SiO 2 inks. Moreover, because GeO 2 -SiO 2 inks are compatible with DIW technology, they offer exciting options for forming new materials with patterned compositions such as gradients in the refractive index that cannot be achieved with conventional manufacturing approaches. |
