Two-die assembly for the extrusion of glasses with dissimilar thermal properties for fibre optic preforms

Lee, E.T.Y.; Taylor, Elizabeth R.

doi:10.1016/j.jmatprotec.2006.11.115

Cited by 8 publications

(4 citation statements)

References 15 publications

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“…Therefore the thickness of cladding for the core would be thinner. In addition Lee and Taylor [30] highlighted that a core glass that was considerably softer and less viscous than the cladding glass during extrusion, could lead to a situation where the core might flow directly through the cladding glass. The cladding distribution along the length of the preform is readily explained by the behaviour of the glass billets in the extruder [18].…”

Section: Extrusion and Fibre Drawingmentioning

confidence: 99%

Core/Clad Phosphate Glass Fibres Containing Iron and/or Titanium

Ahmed¹,

Shaharuddin²,

Sharmin³

et al. 2015

Biomedical Glasses

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Phosphate glasses are novel amorphous biomaterials due to their fully resorbable characteristics, with controllable degradation profiles. In this study, phosphate glasses containing titanium and/or iron were identified to exhibit sufficiently matched thermal properties (glass transition temperature, thermal expansion coefficient and viscosity) which enabled successful co-extrusion of glass billets to form a core/clad preform. The cladding composition for the core/clad preforms were also reversed. Fe clad and Ti clad fibres were successfully drawn with an average diameter of between 30~50 µm. The average cladding annular thickness was estimated to be less than 2 µm. Annealed core/clad fibres were degraded in PBS for a period of 27 days. The strength of the Fe clad fibres appeared to increase from 303 ± 73 MPa to 386 ± 45 MPa after nearly 2 weeks in the dissolution medium (phosphate buffered solution) before decreasing by day 27. The strength of the Ti clad fibres revealed an increase from 236 ± 53 MPa to 295 ± 61 MPa when compared at week 3. The tensile modulus measured for both core/clad fibres ranged between 51 GPa to 60 GPa. During the dissolution study, Fe clad fibres showed a peeling mechanism compared to the Ti clad fibres.

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Section: Extrusion and Fibre Drawingmentioning

confidence: 99%

Core/Clad Phosphate Glass Fibres Containing Iron and/or Titanium

Ahmed¹,

Shaharuddin²,

Sharmin³

et al. 2015

Biomedical Glasses

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“…The typical viscosity range is from 10 7 to 10 9 Pa·s, whereas the ram speed is reduced to values that are typically on the order of 0.5 mm/min and smaller. Additional studies that support the need for extrusion of glass at high viscosity include Seddon et al ., Furniss and Seddon and Lee and Taylor …”

Section: Introductionmentioning

confidence: 99%

Computational Modeling of Die Swell of Extruded Glass Preforms at High Viscosity

et al. 2014

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Computational simulations of glass extrusion are performed to quantify the effects of material behavior and slip at the die/ glass interface on the die swell. Experimental data for three glass types are used to guide the computational study, which considers glass material to be viscous with and without shear thinning and viscoelastic using the Maxwell upper-convected model. The study starts with assuming no-slip at the glass/die interface to see if material behavior alone can explain the die swell results, and then considers slip using the Navier model where interface shear is directly proportional to the relative slip speed at the interface. Consistent with the possibility of slip and intended high viscosity applications, viscosity ranging from 10 7.4 -10 8.8 PaÁs was used. Based on optimization of the various input parameters required to achieve the measured die swell and ram force values, the study concludes that interface slip occurred as only extreme values of the shear thinning parameters provided an alternative.

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“…[8][9][10] In this method, the assembled glass billets are loaded into an extrusion sleeve that is heated above the materials' softening temperature and extruded through a die under high pressure and a fixed speed to obtain a multimaterial preform with core and cladding. This approach is very suitable for glasses with steep viscosity-temperature curve or a high tendency to crystallize.…”

Section: Introductionmentioning

confidence: 99%

Preparation of chalcogenide glass fiber using an improved extrusion method

et al. 2016

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International audienceWe developed the extrusion method to prepare arsenic-free chalcogenide glass fibers with glass cladding. By using the double nested extrusion molds and the corresponding isolated stacked extrusion method, the utilization rate of glass materials was greatly improved compared with the conventional extrusion method. Fiber preforms with optimal stability of core/cladding ratio throughout the 160 mm length were prepared using the developed extrusion method. Typical fiber structure defects between the core/cladding interface, such as bubbles, cracks, and core diameter variation, were effectively eliminated. Ge-Sb-Se/S chalcogenide glasses were used to form a core/cladding pair and fibers with core/cladding structure were prepared by thermally drawing the extruded preforms. The transmission loss, fiber bending loss, and other optical characters of the fibers were also investigated. © 2016 Society of Photo-Optical Instrumentation Engineers (SPIE)

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Two-die assembly for the extrusion of glasses with dissimilar thermal properties for fibre optic preforms

Cited by 8 publications

References 15 publications

Core/Clad Phosphate Glass Fibres Containing Iron and/or Titanium

Core/Clad Phosphate Glass Fibres Containing Iron and/or Titanium

Computational Modeling of Die Swell of Extruded Glass Preforms at High Viscosity

Preparation of chalcogenide glass fiber using an improved extrusion method

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