Evolution of the crack patterns and mechanical properties of silicoborate glasses with substitution of CaO for Na2O
Source abstract
Abstract
In this work, we investigated the microcracking behavior of a series of silicoborate glasses with varying the CaO/(Na2O+CaO) ratio (R) under sharp contact loading. The molar composition of the glass series is 22SiO2–58B2O3–XNa2O-(20-X) CaO (X = 20, 15,10, 5, 0). We found that the shear cracks occurred in the studied glasses when subjecting to a constant load of 4.9 N for 15 s. Interestingly, the probability of the shear crack occurrence decreases with increasing R. Using the Raman spectroscopy and X-ray photoelectron spectroscopy, it was found that the microcrack occurrence and crack resistance (CR) of the glass was closely associated with the change of the glass medium-range structure. We identified a critical R value of 0.75, at which the glass exhibited the highest Young’s modulus, shear modulus and CR. Furthermore, the appearance of shear cracks is primarily governed by the medium-range structure and isochoric shear flow.
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Research context
OpenAlex topics: Glass properties and applications · Recycling and utilization of industrial and municipal waste in materials production · Structural Analysis of Composite Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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