Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 42, Issue 13, Pages 6119-6134Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2022.05.073
Keywords
Glasses; Glass -ceramics; Barium disilicate; Mechanical properties; Residual stress; Microstructure
Categories
Funding
- CAPES
- CNPq
- FINEP
- Sao Paulo Research Foundation (FAPESP) [2013/07793-6]
Ask authors/readers for more resources
Barium disilicate glass-ceramics (GCs) with varying crystallized volume fraction and crystal size were studied for their fracture strength and toughness. The results showed that fracture toughness increased with larger spherulite size and higher crystallized volume fraction. The type of residual stress in the crystals did not affect fracture toughness and strength.
Barium disilicate (BaO.2SiO2=BS2) glass is one of the few stoichiometric glasses that nucleates internally, homogeneously via thermal treatment. This system has been scarcely assessed in microstructure-property studies. Here we address fracture strength and toughness (KIC) variation as a function of crystallized volume fraction and crystal size, as well as the possible effect of residual stresses (RS) in BS2 glass-ceramics (GCs) by independently varying these two microstructural parameters. KIC increased with spherulite size and crystallized volume fraction. KIC variation with crystallized volume fraction was similar for GCs with different crystal sizes. Combination of the current findings on BaO.2SiO2 (crystals under tensile RS) with previous studies of Li2O.2SiO2 GCs (compressive RS) indicates that crystallization of a tougher phase - not type of residual stress in the crystals - is the crucial parameter controlling fracture toughness and strength. These findings are quite useful to design novel strong and tough GCs.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available