About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
ACerS-ECerS Joint Symposium: Emerging Leaders in Glass and Ceramics
|
| Presentation Title |
Glass with Hydration-Induced Compressive Stress Profiles |
| Author(s) |
Timothy Gross |
| On-Site Speaker (Planned) |
Timothy Gross |
| Abstract Scope |
A novel potassium phospho-aluminosilicate (KPAS) glass composition is described that can be strengthened by water vapor to achieve deep compressive stress profiles. This material was initially discovered through a series of hydration experiments in which the KPAS specimen achieved a 29 micron compressive depth after being held at 85% relative humidity and 85oC for 65 days, thus exhibiting diffusivity orders of magnitude greater than comparative glasses. Not only did the KPAS glass have a high Vickers indentation crack resistance of >20 kilograms force (kgf), but it also displayed considerable stored energy at failure. This indication of a residual stress profile was subsequently measured and a compressive stress (CS) of 400 MPa and compressive depth of layer (DOL) of 29 microns was found. It is demonstrated that hydration strengthened glasses provide high retained strength following flaw introduction and ability to self-strengthen. |