Effects of Thermal and Pressure Histories on the Chemical Strengthening of Sodium Aluminosilicate Glass

Svenson, Mouritz Nolsøe; Thirion, Lynn M.; Youngman, Randall E.; Mauro, John C.; Bauchy, Mathieu; Rzoska, Sylwester J.; Boćkowski, Michał; Smedskjær, Morten Mattrup

doi:10.3389/fmats.2016.00014

Cited by 25 publications

(18 citation statements)

References 41 publications

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“…The rate of alkali interdiffusivity depends on the free volume (atomic packing fraction) of the glass network structure (Svenson et al, 2016). And the activation energy has been found to scale with the free volume in the related studies on K + -Na + interdiffusivity (Potuzak and Smedskjaer, 2014;Smedskjaer et al, 2015).…”

Section: Resultsmentioning

confidence: 99%

Mechanical–Structural Investigation of Chemical Strengthening Aluminosilicate Glass through Introducing Phosphorus Pentoxide

Zeng

Yang

et al. 2016

Front. Mater.

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Chemical strengthening of aluminosilicate glasses through K + -Na + ion exchange has attracted tremendous attentions because of the accelerating demand for high strength and damage resistance glasses. However, a paramount challenge still exists to fabricate glasses with a higher strength and greater depth of ion-exchange layer (DOL). Herein, aluminosilicate glasses with different contents of P2O5 were prepared, and the influence of P2O5 on the increased compressive stress (CS) and DOL was investigated by micro-Raman technique. It was noticed that the hardness, CS, as well as the DOL substantially increased with an increasing concentration of P2O5 varied from 1 to 7 mol%. The obtained micro-Raman spectra confirmed the formation of relatively depolymerized silicate anions that accelerated the ion exchange. Phosphorus-containing aluminosilicate glasses with a lower polymerization degree exhibited a higher strength and deeper DOL, which suggests that the phosphorus-containing aluminosilicate glasses have promising applications in flat panel displays, windshields, and wafer sealing substrates.

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Section: Resultsmentioning

confidence: 99%

Mechanical–Structural Investigation of Chemical Strengthening Aluminosilicate Glass through Introducing Phosphorus Pentoxide

Zeng

Yang

et al. 2016

Front. Mater.

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“…Higher CS can be achieved by combining ion exchange with thermal tempering without invoking the adverse effects that lead to lateral crack formation, as shown in Figure 4A. In addition, the time for ion exchange is often reduced due to the more open structure that results in easier diffusion (Svenson et al, 2016). Therefore, the combination of thermal tempering and ion exchange or differential CTE laminating might offer the best overall crack resistance.…”

Section: Discussionmentioning

confidence: 99%

“…Such a counter-intuitive observation hints at the existence of additional non-linear effects induced by the various strengthening techniques. For example, the ion exchange process introduces a composition gradient in the glass that is known to change the local intrinsic properties such as elastic constant, hardness, and flow mechanism (Mackenzie and Wakaki, 1980;Calahoo et al, 2016;Svenson et al, 2016). Importantly, it has been observed that the equilibrium density of ion-exchanged glass fibers is larger than that of glasses with equivalent compositions (Mackenzie and Wakaki, 1980).…”

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confidence: 99%

Competing Indentation Deformation Mechanisms in Glass Using Different Strengthening Methods

et al. 2016

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Chemical strengthening via ion exchange, thermal tempering, and lamination are proven techniques for the strengthening of oxide glasses. For each of these techniques, the strengthening mechanism is conventionally ascribed to the linear superposition of the compressive stress (CS) profile on the glass surface. However, in this work, we use molecular dynamics simulations to reveal the underlying indentation deformation mechanism beyond the simple linear superposition of compressive and indentation stresses. In particular, the plastic zone can be dramatically different from the commonly assumed hemispherical shape, which leads to a completely different stress field and resulting crack system. We show that the indentation-induced fracture is controlled by two competing mechanisms: the CS itself and a potential reduction in free volume that can increase the driving force for crack formation. Chemical strengthening via ion exchange tends to escalate the competition between these two effects, while thermal tempering tends to reduce it. Lamination of glasses with differential thermal expansion falls in between. The crack system also depends on the indenter geometry and the loading stage, i.e., loading versus after unloading. It is observed that combining thermal tempering or high free volume content with ion exchange or lamination can impart a relatively high CS and reduce the driving force for crack formation. Therefore, such a combined approach might offer the best overall crack resistance for oxide glasses.

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“…Isostatic glasses were found to exhibit a stress-free character [144,145]. Isostatic glasses have also been found to exhibit optimal strengthening upon ion exchange [63,85,146,147]. Sub-critical crack growth was reported to be controlled by the atomic topology [148].…”

Section: 6mentioning

confidence: 99%

Topological Constraint Theory and Rigidity of Glasses

Bauchy¹

2019

21st Century Nanoscience – A Handbook

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Topological constraint theory has become an increasingly popular tool to predict the compositional dependence of glass properties or pinpoint promising compositions with tailored functionalities. This approach reduces complex disordered networks into simpler mechanical trusses. Thereby, topological constraint theory captures the important atomic topology that controls macroscopic properties while filtering out less relevant second-order structural details. As such, topological constraint theory can be used to decode the genome of glass, that is, to identify and decipher how the basic structural building blocks of glasses control their engineering properties-in the same way as the human genome offers information that serves as a blueprint for an individual's growth and development. Thanks to its elegance and simplicity, topological constraint theory has enabled the development of various physics-based models that can analytically predict various properties of glass. In this Chapter, I introduce some general background in glass science, concepts of atomic rigidity, and topological constraint theory. The topological constraints enumeration scheme is presented for various archetypical glasses and is used to understand the origin of their glass-forming ability. Finally, various topological models enabling the prediction of glass properties are reviewed, with a focus on hardness, fracture toughness, viscosity, fragility, glass transition temperature, and dissolution kinetics. Time Scientific progress Fig. 1: The discovery of new materials largely defines the progress of our civilization. Glass genome and discovery of new compositionsRevealing the full potential of glass requires the discovery of new glass formulations showing unique properties. However, this task is especially complicated for non-crystalline glassy materials for several reasons. First, virtually all the elements of the periodic table can be turned into a glass, if cooled fast enough from the liquid state [9]. Second, unlike crystals, glasses do not have to satisfy any fixed stoichiometry thanks to their out-of-equilibrium nature. As such, the composition of glasses can be continuously changed. For all these reasons, the number of possible glass compositions has been estimated to be around 1052! Yet, only about 200,000 glass compositions have been produced in the last 6000 years of human glass history [9]. These numbers demonstrate that the range of possible glasses remains largely unexplored-so that there exists an incredible opportunity for the future discovery of new glass formulations with unusual functionalities.However, although it offers a large room for improvement, the astronomical number of possible glass compositions is also a challenge. Indeed, such a large parametric space renders traditional Edisonian discovery approach based on trial-and-error largely inefficient. To accelerate the discovery of new glass formulations, it is necessary to decode the Glass Genome, that is, to decipher how the properties of glasses are controlled by their und...

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Effects of Thermal and Pressure Histories on the Chemical Strengthening of Sodium Aluminosilicate Glass

Cited by 25 publications

References 41 publications

Mechanical–Structural Investigation of Chemical Strengthening Aluminosilicate Glass through Introducing Phosphorus Pentoxide

Mechanical–Structural Investigation of Chemical Strengthening Aluminosilicate Glass through Introducing Phosphorus Pentoxide

Competing Indentation Deformation Mechanisms in Glass Using Different Strengthening Methods

Topological Constraint Theory and Rigidity of Glasses

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