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Communication Dans Un Congrès Année : 2021

Effects of Amorphous Phase Separation on SiO2-B2O3-Na2O Glasses Properties

Résumé

Sodium borosilicate (SBN) glasses concern an important research topic as the three components (SiO2, Na2O, and B2O3) corresponding to the three principal oxides of many industrial glasses. For certain chemical compositions, an important feature includes amorphous phase separation (APS) which has industrial relevance for crush resistant glasses, porous glasses and glass ceramics. Moreover, theory, simulations, and experiments evidenced two-phase APS glasses; however, there is the possibility of three-phase APS for some compositions. APS inside the glasses induces complex heterogeneous structures at the nano-scale, which alters the glasses' physical and mechanical properties (including stress corrosion cracking (SCC) behavior). However, the connection between the structure of APS glasses and their properties remains poorly understood, especially the SCC behavior. In this presentation, we will look at a SBN sample with compositions falling in the hypothesized three-phase APS zone. I will present results on how annealing the sample aids the growth of the phase separation as seen by an AFM. Besides, TEM provides some clues to the APS structure. Additionally, NMR spectrums aid in understanding the short-range structure of the APS glasses. Nano-mechanical (PF-Tapping) AFM techniques were used to characterize the local mechanical properties of different phases. Moreover, stress corrosion cracking tests along with post-mortem studies of fracture surfaces were performed to understand the failure mechanisms in these phases separated systems. These results will also be discussed. This study will aid in capturing holistic viewpoint of how glasses fail.
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Dates et versions

hal-03285281 , version 1 (13-07-2021)

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  • HAL Id : hal-03285281 , version 1

Citer

Weiying Feng, Cindy L. Rountree, Daniel Bonamy, Fabrice Célarié, Remy Baniel, et al.. Effects of Amorphous Phase Separation on SiO2-B2O3-Na2O Glasses Properties. E-MRS Spring Meeting, E-MRS, May 2021, Online, France. ⟨hal-03285281⟩
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