Masters Theses

Keywords and Phrases

Glass Fibers; Glass Science; Optical Glass

Abstract

"Fibers were draw from melts of a commercial Na-aluminosilicate for ion-exchange treatments. A process was developed to draw 100-meters of fiber with a diameter of 100±10m. The fibers were sectioned for ion exchange treatments. SEM analysis showed an ion penetration depth of 45um after 4 hours of ion exchange in a 400°C KNO3 salt bath. The pristine and ion-exchanged fibers were characterized by a two-point bend test in room temperature air with controlled relative humidity (RH) and faceplate velocities between 100 and 4000 μm/s to characterize fatigue effects. Pristine fibers tested in air (40% RH) at 4000 μm/s had failure strains of 7.3±0.2%, whereas the ion exchanged fibers had failure strains of 6.9±0.1%. The dynamic fatigue parameter of the ion-exchanged fibers was about half (8±5) that measured for pristine glasses (14±3). Additionally, glasses with the nominal molar compositions (10-30)ZnO•(10-50)Bi2O3•(10-20) B2O3•(40-50) SiO2 were prepared and characterized to identify compositions suitable for high refractive index fibers. Glasses were characterized by X-ray spectroscopy techniques. Glass transition (Tg) and crystallization (Tx) temperatures were determined using differential scanning calorimetry, and thermal expansion coefficients were measured by thermomechanical analysis. The refractive indices for these glasses were between 1.7 and 2.2 at 518nm and the coefficient of thermal expansion ranged between 50 and 100x10-7/°C. These glasses have a small working range (Tx-Tg) and compositions with greater Bi2O3 contents crystallized more readily. Fibers with lengths around about 35m and diameters between 130 and 180m were successfully drawn from a melt with the nominal molar composition of 10ZnO•30Bi2O3•20B2O3•40SiO2"-- Abstract, p. iii

Advisor(s)

Brow, Richard K.

Committee Member(s)

Lonergan, Charmayne E.
Watts, Jeremy Lee, 1980-

Department(s)

Materials Science and Engineering

Degree Name

M.S. in Ceramic Engineering

Publisher

Missouri University of Science and Technology

Publication Date

2026

Pagination

xi, 76 pages

Note about bibliography

Includes_bibliographical_references_(pages 55-56)

Rights

© 2024 Theodore Carver Lewis , All Rights Reserved

Document Type

Thesis - Open Access

File Type

text

Language

English

Thesis Number

T 12636

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