Structural state of the strengthened surface of severely tempered glass

Pavlushkin, N. M.; Sil'vestrovich, S. I.; Firsov, V. M.; Kazakov, V. D.

doi:10.1007/bf00550208

Cited by 3 publications

(1 citation statement)

References 3 publications

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“…4 may also lead to a lower flexure strength. After thermal tempering, a more disrupted structure is formed in the surface layers due to quick quenching from over the glass transition temperature which leads to a lower density and bending strength [30,57]. Hence the diffusion of alkali ions into the glass matrix in thermally tempered glass is easier which may result in the effect of diffusion coefficient on MOR for hybrid tempered glass is more remarkable.…”

Section: Correlation Between Diffusion Coefficient and Flexural Strengthmentioning

confidence: 99%

Correlation between K+-Na+ diffusion coefficient and flexural strength of chemically tempered aluminosilicate glass

Jiang

Wang

et al. 2017

Journal of Non-Crystalline Solids

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The correlation between K + -Na + diffusion coefficient and mechanical properties of chemically tempered and hybrid tempered (chemically tempered subsequent to thermally tempered) aluminosilicate glass are investigated. Firstly, the potassium ion concentration profiles are experimentally measured and the diffusion coefficient is calculated according to the Boltzmann-Matano approach. Secondly, the flexure strength and Weibull modulus are determined using a combined experimental (coaxial double ring) and finite element analysis method. The results indicate that the flexural strength decreases with the diffusion coefficient of the air side for both types of glass samples while there is no significant relationship between diffusion coefficient and Weibull modulus. Diffusion coefficient on air side shows a higher value than that of the tin side. With the same diffusion coefficient, the flexural strength of chemically tempered glasses are found to be higher than that for hybrid tempered glasses. The effect of diffusion coefficient on modulus of rupture (MOR) for hybrid tempered glass is more remarkable. These results would be useful in designing the strength of glass and guiding the strengthening process by chemical or hybrid tempering.

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Section: Correlation Between Diffusion Coefficient and Flexural Strengthmentioning

confidence: 99%

Correlation between K+-Na+ diffusion coefficient and flexural strength of chemically tempered aluminosilicate glass

Jiang

Wang

et al. 2017

Journal of Non-Crystalline Solids

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Controlling Interconnected Silver Network Structure in Sol–Gel Nanocomposite Via Shrinkage‐Induced Stress

2012

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Materials synthesized via solution route sol-gel method are suitable for applications that rely on selectivity in diffusion, [1] size exclusion and filtration, [2] and encapsulation [3,4] because of their intrinsic nanoporous structures. These pore structures that occur spontaneously during the gelation reaction are highly interconnected. Many literatures have reported on how pore diameters, pore structures, and pore volumes can be controlled. [5,6] However, using these nanoscale pores as the template to produce secondary interconnected structures has been difficult due to that limited diffusion and the existing defects usually result in uneven distribution. We have reported that by incorporating low molecular weight polyethylene glycol (PEG), silver nanoparticles and silver chloride nanoparticles inside the pores of sol-gel materials remain mobile and they are able to transport to the surface when the sol-gel material is under shrinkage-induced stress. [7] It is known that silica materials synthesized by sol-gel method tend to shrink during drying. Solvent evaporation causes the pore structure of sol-gel materials to collapse and shrink, and such shrinkage often induce stress, resulting in cracks. This is particularly common on films made by sol-gel processes as cracks are often thickness-dependent. [8] Here we demonstrate that the microcracks also occur during the drying of a monolithic sol-gel sample and such microcrack surfaces can be utilized as the template to form interconnected silver structures (Scheme 1a). We also show that the density of silver structure is related to the volume shrinkage rate in the drying process while the density is not related to the final annealing stage where the induced stress and reductive polymer environment facilitate the formation of interconnected silver network without causing the sample to disintegrate (Scheme 1b).The general procedure for creating interconnected silver network in sol-gel nanocomposites includes preparation of wet gels, followed by aging and drying to form xerogels, and then annealing heat-treatment at 160 8C. The drying step was carried out by heat treatment at various temperatures (40-80 8C) to achieve various degrees of drying states prior to the final annealing step at 160 8C. During the annealing treatment, black samples became sliver reflective color, indicating metallic silver layers have been produced. We have previously reported that interconnected silver layers appear on both surface and internal space of sol-gel materials, and their interconnectivity is related to the amount of polymer in the samples. [7] Here, the sample dimension at each stage was shown in order to evaluate the degree of drying for the drying process (Figure 1). All aged gels retained 85% of the original size of wet gel volume and, respectively, shrank to 78, 72, and 61% of the wet gel size when drying for 4 h at 40, 60, and 80 8C. The final size after annealing is %55% of the wet gel and this value is independent of the drying process. Therefore COMMUNICATION [*] Dr.An inter...

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Influence of thermal quench on fracture strength, elastic modulus and internal friction of glass plates

Chiu

Case

1992

J Mater Sci

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Structural state of the strengthened surface of severely tempered glass

Cited by 3 publications

References 3 publications

Correlation between K+-Na+ diffusion coefficient and flexural strength of chemically tempered aluminosilicate glass

Correlation between K+-Na+ diffusion coefficient and flexural strength of chemically tempered aluminosilicate glass

Controlling Interconnected Silver Network Structure in Sol–Gel Nanocomposite Via Shrinkage‐Induced Stress

Influence of thermal quench on fracture strength, elastic modulus and internal friction of glass plates

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