Fused silica glasses are of great importance for applications in optics, photonics, electronics, and biochemistry. However, their harsh processing nature still constrains the design and development of fused silica glasses for advanced applications. Additive manufacturing (AM) is among the promising techniques to improve the fabrication of fused silica glasses. Herein, we develop an integrated paste printing and laser in-situ melting technology to additively manufacture fused silica glasses without post-heat-treatments. For every layer, the fused silica paste was first printed by an air-pumped dispenser based on the predesignated CAD model, and subsequently melted by a CO laser to become transparent glasses. To improve the paste printing process, the shear thinning property of the developed fused silica paste was investigated to evaluate the printability of the paste, and the control strategy of the paste printing parameters was developed for precise thickness control of the printed paste layer. By optimizing the laser processing parameters, the surface waviness and roughness of the laser-melted glass layers were effectively minimized, indicating the surface uniformity was improved. To evaluate the optical properties of the laser-melted glasses, the optical transmittance and refractive indices of the fused silica glasses melted by different laser powers were characterized. Through stacking the laser-melted fused silica glasses layer-by-layer, three-dimensional (3D) fused silica glass components with unusual thin-wall structures and embedded microfluidic channels have been directly printed, demonstrating that the developed glass AM technology is promising for advanced applications such as microfluidics, integrated optics, and metamaterials.

中文翻译：

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使用集成浆料印刷和激光原位熔化技术直接增材制造透明熔融石英玻璃

熔融石英玻璃在光学、光子学、电子学和生物化学领域的应用非常重要。然而，其严酷的加工特性仍然限制了熔融石英玻璃先进应用的设计和开发。增材制造 (AM) 是改善熔融石英玻璃制造的有前途的技术之一。在此，我们开发了一种集成的浆料印刷和激光原位熔化技术，无需后热处理即可增材制造熔融石英玻璃。对于每一层，首先使用基于预先指定的 CAD 模型的气动分配器打印熔融石英浆料，然后通过 CO 激光熔化，形成透明玻璃。为了改进浆料印刷工艺，研究了所开发的熔融石英浆料的剪切稀化特性，以评估浆料的印刷适性，并开发了浆料印刷参数的控制策略，以精确控制印刷浆料层的厚度。通过优化激光加工参数，激光熔化玻璃层的表面波纹度和粗糙度得到有效最小化，表明表面均匀性得到改善。为了评估激光熔化玻璃的光学性能，对不同激光功率熔化的熔融石英玻璃的光学透射率和折射率进行了表征。通过逐层堆叠激光熔化的熔融石英玻璃，可以直接打印出具有不寻常的薄壁结构和嵌入式微流通道的三维（3D）熔融石英玻璃组件，这表明所开发的玻璃增材制造技术具有广阔的应用前景。微流体、集成光学和超材料等先进应用。