Recent Developments in Chemically Strengthened Glasses

Green, David J.

doi:10.1002/9780470294857.ch20

Cited by 5 publications

(6 citation statements)

References 21 publications

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“…[3][4][5][6][7] For example, it has been shown previously that surface flaws with a size of more than 30 μm make a given glass product unreliable in terms of its residual fracture strength. 8,9 In order to improve the mechanical properties of glass, glass surface treatments are typically applied, primarily including thermal or chemical strengthening processes. Especially the second process generates higher strength, often exceeding the GPa range.…”

Section: Introductionmentioning

confidence: 99%

Effect of surface cleaning prior to chemical strengthening process of glass

Atılgan

Özben²,

Sökmen³

et al. 2020

Int J of Appl Glass Sci

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This work focuses on the effect of surface cleaning treatments of soda‐lime‐silicate float glasses before chemical strengthening where a compressive stress layer is introduced via ion exchange. As‐received and cleaned glass surfaces were subjected to two different treatments using demineralized water and acidic solutions were subjected to ion exchange in a molten KNO3 bath for 8 hours at 450°C. Precleaning treatment leads to a relative enhancement of the potassium surface concentration following chemical strengthening as compared to the uncleaned samples, also reflecting in altered surface stress profiles and case depth. These observations provide guidance for optimal pretreatment conditions of glass for chemical strengthening. Appropriate cleaning treatments can result in higher achievable fracture loads of subsequently chemically tempered glasses in ring‐on‐ring biaxial bending tests.

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Section: Introductionmentioning

confidence: 99%

Effect of surface cleaning prior to chemical strengthening process of glass

Atılgan

Özben²,

Sökmen³

et al. 2020

Int J of Appl Glass Sci

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“…The chemical tempering results in higher compression at surface thus larger strengthening, compression depth is smaller, better optical quality, but costlier than conventional thermal tempering. The analysis of the chemical tempering process for different application of glasses is discussed in (Arrazola and Özel, 2010;Bao-Wei et al, 2016a;Deng and Murakawa, 2006;Boubakera et al, 2014;Bao-Wei et al, 2016b;Varshneya and Kreski, 2012;Mazzoldi et al, 2013;Green, 2008;Varshneya, 2010a;Karlsson et al, 2010;Gy, 2008;Varshneya, 2010b;2016;Xiangchen et al, 1986;Araujo et al, 2003;Fu and Mauro, 2013;Sglavo et al, 2014;Sglavo, 2015;Varshneya and Spinelli, 2009;Saunders and Kubichan, 1969;Shelestak et al, 2005). The structure-property relationship depends on each network former and modifier, chemical composition along with the thermal history of glass (Kolitsch and Richter, 1980;Hevesy, 1928;Frischat, 1975;Cormier et al, 2000;Du and Stebbins, 2005;Wu and Stebbins, 2010;Zheng et al, 2012a).…”

Section: Introductionmentioning

confidence: 99%

Effect of Novel Thermo-Chemical Treatment on Bending Strength of Laminated Glass

Vedrtnam¹

2018

International Journal of Structural Glass and Advanced Material

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The science of thermal and chemical treatment of glass is well documented. The Laminated Glass (LG) is usually not treated as either treated glass is used during production or lower melting temperature of interlayer does not allow the treatment. The present work reports the novel methods of thermo-chemical treatment of LG having annealed soda lime glass plies. Five thermo-chemical treatments were performed on LG using different salts (Potassium Nitrate Carbohydrazide, Lithium Nitride), via clay coating (saturated with salts), using fused silica wafer coated with a thin graphene layer and utilizing the microwave heating. The bending strength is measured before and after thermo-chemical treatment using Q-set coupled bending tester (following the ASTM D790-03). The linear elastic model is utilized for obtaining normal stress and deformation at fracture load using ANSYS 14.5. The bending strength of thermo-chemical treated LG sample was found significantly higher than untreated LG in the most cases. The fracture pattern of the treated LG was also modified compared to the untreated LG as impurities and defects were reduced during treatment. The mechanics of increased bending strength and modified fracture is also discussed with reference to the effects of thermo-chemical treatment of LG, however, the need of a specialized numerical method that can effectively model the implications of treatment on LG and multiple fractures experienced by the LG during testing are suggested as future work.

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“…Although naturally brittle, glass has a fundamental role in different everyday life applications such as electronics, cell phones, solar cells, architectural components, and containers. Theoretically, glass is considered one of the strongest man‐made materials; in practice, flaws make it unreliable and weak from the mechanical point of view . Among the several reinforcement techniques proposed during the years, chemical tempering is a straightforward and efficient technique for improving the mechanical performance of alkali silicate glasses …”

Section: Introductionmentioning

confidence: 99%

“…Because of the diffusion nature of the process, treatments have to be carried out at relatively high temperature for several hours. For this reason, stress relaxation can occur and make strengthening less efficient than expected . The process can be enhanced by applying ultrasonic waves, microwave heating or electric fields (E‐Fields) .…”

Section: Introductionmentioning

confidence: 99%

Electric field‐assisted ion exchange strengthening of borosilicate and soda lime silicate glass

Talimian

Mariotto

2017

Int J of Appl Glass Sci

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In this study, we investigate the effects of electric field-assisted ion exchange (EF-IE) on potassium for sodium ion exchanges of soda borosilicate and soda lime silicate glasses. The results show that applying an electric field (E-field) with the intensity of 1000 V cm À1 for few minutes produces an exchanged layer with a thickness comparable to the conventional chemical strengthening for 4 hours. There is a critical E-field that increases the mobility and, therefore, the diffusion coefficient of the potassium ions in the glasses. The increase is, perhaps, related to the evolution of the glass structure due to the penetration of potassium ions under an E-field. Vickers indentations showed that strong compression is generated in the glass by EF-IE; however, the bending strength improvement is limited because of the presence of large surface defects and the stress distribution inhomogeneity. K E Y W O R D Sborosilicate, chemical strengthening, electric field-assisted ion exchange, soda lime silicate

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Recent Developments in Chemically Strengthened Glasses

Cited by 5 publications

References 21 publications

Effect of surface cleaning prior to chemical strengthening process of glass

Effect of surface cleaning prior to chemical strengthening process of glass

Effect of Novel Thermo-Chemical Treatment on Bending Strength of Laminated Glass

Electric field‐assisted ion exchange strengthening of borosilicate and soda lime silicate glass

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