Influence of Thermal Annealing and a Glass Coating on the Strength of Soda-Lime-Silicate Glass

Report No. ARL-TN-0858
Authors: Mariel H Gaviola, Steven Kilczewski, Jeffrey J Swab, Parimal J Patel, Luke Gilde
Date/Pages: November 2017; 16 pages
Abstract: This project investigated the influence that thermal annealing and the addition of a glass coating has on the flexure strength of a soda-lime-silicate glass used in a variety of military ballistic armor applications. A mixture of glass powder and isopropyl alcohol was sprayed onto the tin side of as-manufactured soda-lime-silicate glass plates and on plates with a 10-mm-long scratch created with either a 1- or 10-N scratch load. The glass coating was cured using an annealing cycle of 6 °C/min from room temperature to 675 °C, followed by a 1.5-h hold at temperature, and then cool down to room temperature at 3 °C/min. Plates that were scratched showed a noticeable strength increase following the annealing process; however, the addition of the glass coating did not result in an additional strength increase for the scratched plates.
Distribution: Approved for public release
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Last Update / Reviewed: November 1, 2017