The viscosity window of the silicate glass foam production

Petersen, Rasmus Rosenlund; König, Jakob; Yue, Yuanzheng

doi:10.1016/j.jnoncrysol.2016.10.041

Cited by 85 publications

(37 citation statements)

References 36 publications

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“…The samples sintered at 25 MPa start to foam at 540‐585°C (Figure ), corresponding to a viscosity of 10 11 ‐10 9.6 Pa s . The foaming onset slightly depends on the gas type as the He‐sintered sample starts to expand at slightly lower temperatures than Ar‐ and N 2 ‐sintered samples.…”

Section: Resultsmentioning

confidence: 99%

“…The samples sintered at 25 MPa start to foam at 540-585°C ( Figure 2), corresponding to a viscosity of 10 11 -10 9.6 Pa s. 22 The foaming onset slightly depends on the gas type as the He-sintered sample starts to expand at slightly lower temperatures than Ar-and N 2 -sintered samples. The He-sintered sample reaches a maximum expansion at 605°C, then contracts slightly with a minimum around 700°C, followed by a small expansion.…”

Section: Resultsmentioning

confidence: 99%

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Foam glass obtained through high‐pressure sintering

et al. 2018

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Foam glasses are usually prepared through a chemical approach, that is, by mixing glass powder with foaming agents, and heating the mixture to a temperature above the softening point (106.6 Pa s) of the glass. The foaming agents release gas, enabling expansion of the sintered glass. Here, we use a physical foaming approach to prepare foam glass. First, closed pores filled with inert gases (He, Ar, or N2) are physically introduced into a glass body by sintering cathode ray tube (CRT) panel glass powder at high gas pressure (5‐25 MPa) at 640°C and, then cooled to room temperature. The sintered bodies are subjected to a second heat treatment above the glass transition temperature at atmospheric pressure. This heat treatment causes expansion of the pores due to high internal gas pressure. We found that the foaming ability strongly depends on the gas pressure applied during sintering, and on the kinetic diameters of the gases. The pressure for attaining maximum expansion, that is, lowest density and highest porosity, is found to be around 20 MPa.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Foam glass obtained through high‐pressure sintering

et al. 2018

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“…Ashes have a large amount of carbon that cause the formation of gases at temperatures between 600-1000°C, which can be seen in detail in Figure 1. The firing temperature for the production of glass foams is critical because it is directly related to the glass viscosity, and its expansion is caused by the gas release from the foaming agent decomposition [3,40]. In this case, two pore forming processes are effective.…”

Section: Methodsmentioning

confidence: 99%

“…That is, there is an expansion of the vitreous matrix due to the release of gas (Figure 1-yerba mate ashes) at the temperature at which there is an adequate viscosity in the glass. The most convenient viscosity range for the expansion of the glass foam production with maximum porosity corresponds to temperatures between 800-1000°C for soda-lime glasses [3,40]. Figure 2 shows the porosity of glass foams produced with different amounts of yerba mate fired at 850ºC and 900ºC for 60 min.…”

Section: Methodsmentioning

confidence: 99%

Glass foams produced from glass and yerba mate (Ilex paraguarinensis) waste

Lucas¹,

Leila²,

Santacruz³

et al. 2018

FME Transaction

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In this study, compositions containing green glass bottles and desiccated and crushed yerba mate (Ilex paraguarinensis) of different mass fractions (10-30%) were prepared to obtain glass foams for thermal insulation purposes. These compositions were uniaxially pressed (at 40 MPa), and the compact powders were fired at 850°C and 900°C for 60 min in order to investigate the effect of yerba mate and temperature on the formation of pores and the thermal and mechanical properties of the processed glass foams. The results indicated that the glass foams displayed porosities ranging from 65.3-88.3%, compressive strengths ranging from 15-1.5 MPa, and thermal conductivities ranging from 0.6-0.04 W•m-1 •K-1. Cumulatively, these glass foams are candidate thermal insulators that have advantageous properties for various industrial applications.

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“…Following this work, the viscosity data of other glass compositions are further validated through this modified Eyring model. The viscosity data of different glasses were collected, including borate [41], silicate [42], borosilicate glasses [43], anorthite and diopside [28], chalcogenide system Se-Te [44], and metallic liquid [45]. The calculated data are shown in Figure 4 with a good fit to viscosity-temperature data of these amorphous materials.…”

Section: Calculationmentioning

confidence: 98%

A Novel Viscosity-Temperature Model of Glass-Forming Liquids by Modifying the Eyring Viscosity Equation

et al. 2020

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Many models have been created and attempted to describe the temperature-dependent viscosity of glass-forming liquids, which is the foundational feature to lay out the mechanism of obtaining desired glass properties. Most viscosity models were generated along with several impact factors. The complex compositions of commercial glasses raise challenges to settle these parameters. Usually, this issue will lead to unsatisfactory predicted results when fitted to a real viscosity profile. In fact, the introduction of the reliable viscosity-temperature data to viscosity equations is an effective approach to obtain the accurate parameters. In this paper, the Eyring viscosity equation, which is widely adopted for molecular and polymer liquids, was applied in this case to calculate the viscosity of glass materials. On the basis of the linear variation of molar volume with temperature during glass cooling, a modified temperature-dependent Eyring viscosity equation was derived with a distinguished mathematical expression. By means of combining high-temperature viscosity data and the glass transition temperature (Tg), nonlinear regression analysis was employed to obtain the accurate parameters of the equation. In addition, we have demonstrated that the different regression methods exert a great effect on the final prediction results. The viscosity of a series of glasses across a wide temperature range was accurately predicted via the optimal regression method, which was further used to verify the reliability of the modified Eyring equation.

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The viscosity window of the silicate glass foam production

Cited by 85 publications

References 36 publications

Foam glass obtained through high‐pressure sintering

Foam glass obtained through high‐pressure sintering

Glass foams produced from glass and yerba mate (Ilex paraguarinensis) waste

A Novel Viscosity-Temperature Model of Glass-Forming Liquids by Modifying the Eyring Viscosity Equation

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