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Influence of acid leaching surface treatment on indentation cracking of soda lime silicate glass

Journal Article · · Journal of Non-Crystalline Solids
 [1];  [2];  [2];  [2];  [3];  [2];  [2];  [2];  [2]
  1. Pennsylvania State University, University Park, PA (United States); Vitro Glass Technology Center, Cheswick, PA (United States); Pennsylvania State University
  2. Pennsylvania State University, University Park, PA (United States)
  3. Pennsylvania State University, University Park, PA (United States); Montanuniversitaet Leoben (Austria)

Past work has shown that water or acid soaking treatments can increase the mechanical strength of soda lime silicate (SLS) glasses. In this work, we show that acid leaching treatments result in an increase in the apparent crack resistance of the acid-leached surface of SLS glass during indentation. Vickers indentation tests in controlled environments show a humidity dependence of radial cracking, suggesting that the transport of water through the leached layer plays a critical role in the propagation of cracks to the glass surface. Here, molecular dynamics simulations with reactive force fields indicate that the leached surface layer can undergo pressure-induced mechanochemical reactions during indentation, which increases the bridging oxygen connectivity in the silica network of the leached layer. Such structural changes can hinder transport of water molecules from the environment to the subsurface crack tip. Based on experimental observations and simulation results, a new hypothesis is proposed that mechanochemical restructuring in the leached layer in response to the applied load may lower the transport kinetics of molecular water to critical flaws, resulting in an apparent enhancement in the crack resistance of the acid-leached surface of SLS glass.

Research Organization:
Pennsylvania State University, University Park, PA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation
Grant/Contract Number:
SC0016584
OSTI ID:
1668142
Alternate ID(s):
OSTI ID: 1703250
Journal Information:
Journal of Non-Crystalline Solids, Journal Name: Journal of Non-Crystalline Solids Vol. 543; ISSN 0022-3093
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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