Effect of pressurization on the fracture toughness of borosilicate glasses

KH Lee and YJ Yang and LF Ding and B Ziebarth and JC Mauro, JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 105, 2536-2545 (2022).

DOI: 10.1111/jace.18207

In this study, hot-compression is applied to two multicomponent borosilicate glasses, Borofloat33 (Boro33) and N-BK7, using molecular dynamics simulations. The effects of pressure on elastic properties, surface energy, and fracture toughness (KIC) are investigated. It is found that the impact on KIC is mainly dominated by the change of Young's modulus under pressure, which is proportional to the relative change in density. Between the two glasses under investigation, KIC can be improved more effectively by the hot-compression process for Boro33, due to its higher concentration of 3-coordinated boron (B-3), which facilitates densification via B-3 to B-4 conversion under compression.

Return to Publications page