Abstract
A miniature co‐extrusion technique, to produce a concentric multilayered glass fiber‐optic preform of ~3 mm diameter, is modeled and experimentally demonstrated. A three‐dimensional, incompressible, noncavitating, and nonisothermal Computational Fluid Dynamics (CFD) model, similar to one developed in our previous work, is used to predict the dimensions of an alternating four‐layer glass stack feed required to produce the desired layer dimensions in a multilayered‐glass preform extrudate, using a miniaturized and thus more economical co‐extrusion. Strong agreement in the cross‐sectional geometrical proportions of the simulated and experimentally obtained preform supports the prowess of the predictive modeling. Nevertheless, some small deviations between the simulated and experimentally obtained dimensions indicate topics for future rheological study. Performing the co‐extrusion process under vacuum helps to minimize the inter‐layer defects in the multi‐layered fiber‐optic preform. The miniature co‐extrusion potentially removes the need for a postextrusion draw‐down prior to fiber drawing, avoiding devitrification issues possible in non‐oxide novel glass compositions.
Highlights
Co-extrusion of polymers [1, 2] and glasses [3] has been undertaken for quite a few decades
Good imaging contrast was found under scanning electron microscopy (SEM), due to the chemical-compositional contrast of the two glasses caused by the presence/absence of sulfur
We have demonstrated a miniature extrusion technique for making chalcogenide glass fiber-optic preforms
Summary
Co-extrusion of polymers [1, 2] and glasses [3] has been undertaken for quite a few decades. Re glass-supercooled melt under an inert atmosphere, or vacuum, is prerequisite It can be observed from [5,6,7,8,9,10,11] that hot ram extrusion of novel glasses is usually done on a vi relatively large-scale. In this previous work, the starting glass-stack feed was generally 18-30 ew mm in diameter and resulted in a 7-10 mm diameter extrudate. The concentric rings out from the core have been given the nomenclature: d1 and d2 traveling outwards from the core
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