Thermal conductivity of heat-absorbed soda-lime-silicate glasses at high temperatures

Kiyohashi, Hiroshi; Hayakawa, Naoya; Aratani, Shin'ichi; Masuda, Hidetoshi

doi:10.1068/htwu353

Cited by 10 publications

(4 citation statements)

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“…3. [35][36][37][38][39][40] This difference causes more effective confinement of generated heat in the Si layer on soda lime glass than on quartz, resulting in complete areal crystallization under lower lamp irradiance. Figure 4 indicates Raman spectra of poly-Si films on soda lime glass with a 200-nm-thick Cr film.…”

Section: Resultsmentioning

confidence: 99%

Formation of Several-Micrometer-Thick Polycrystalline Silicon Films on Soda Lime Glass by Flash Lamp Annealing

Ohdaira

Fujiwara

Endo

et al. 2008

jjap

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We have succeeded in forming polycrystalline silicon (poly-Si) films with thicknesses of over 4 mm on soda lime glass by flash lamp annealing (FLA) of precursor amorphous Si (a-Si) films deposited by catalytic chemical vapor deposition (Cat-CVD). The insertion of Cr thin films between glass substrates and a-Si significantly improves the adhesion of Si films to the glass substrates, resulting in uniform crystallization of a-Si in 20 Â 20 mm 2 area. Several types of substrate, such as quartz substrates, are also used instead of soda lime glass to elucidate the effects of the properties of glass substrates on formation of the poly-Si films. a-Si films tend to be crystallized under lower irradiance than those on quartz glass substrates, which can be described by the lower thermal conductivity and the thermal diffusion length of soda lime glass. Raman spectra of the poly-Si films on soda lime glass show high crystallinity close to unity. The utilization of soda lime glass with poor thermal resistivity is of great importance for the cost-effective mass production of thin-film poly-Si solar cells.

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Section: Resultsmentioning

confidence: 99%

Formation of Several-Micrometer-Thick Polycrystalline Silicon Films on Soda Lime Glass by Flash Lamp Annealing

Ohdaira

Fujiwara

Endo

et al. 2008

jjap

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“…They can be divided into transient and steady‐state methods . Transient methods such as the hot wire method, various laser flash methods, the periodic heat flow method, and the needle probe method have been used to measure the thermal diffusivity of glassmelts. Then, one needs to measure density and specific heat to retrieve the glassmelt thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

“…This study focuses on steady‐state methods for their simplicity and the fact that they directly measure the thermal conductivity. Finally, attempts have been made to partially correct the effect of radiation heat transfer on the temperature profile and retrieve the phononic (also referred as “true”) thermal conductivity based on inverse methods requiring knowledge of the container's total hemispherical emissivity, the glassmelt spectral index of refraction and absorption coefficient in the infrared part of the spectrum as functions of temperature …”

Section: Introductionmentioning

confidence: 99%

Effective Thermal Conductivity of Soda‐Lime Silicate Glassmelts with Different Iron Contents Between 1100°C and 1500°C

2013

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This study presents a simple method for retrieving the effective thermal conductivity of semitransparent glassmelts from measured temperature profiles. Effective thermal conductivity of molten glass at high temperature is an important thermophysical property that affects the glassmelting and forming processes and thus the quality of the final glass products. In semitransparent glassmelts, heat is transferred by both conduction and radiation. In the limiting case of optically thick glassmelts, typically featuring high iron content, thermal radiation can be treated as a diffusion process. The total heat flux can be expressed as the sum of a phononic and a radiative heat fluxes based on Fourier's law. For weakly absorbing glassmelts, the temperature profile may be strongly nonlinear particularly neat container walls due to the contribution from emission and absorption. Steady-state measurement techniques, such as the linear heat flux method, have been developed to measure glassmelt effective thermal conductivity at high temperatures. However, they typically use only three temperatures measurements and assume linear temperature profile in the glassmelt. The new retrieval method addresses these drawbacks particularly for weakly absorbing glassmelts featuring nonlinear temperature profiles. It is demonstrated with experimental data collected for sodalime silicate glasses with iron content ranging from 0.008 to 1.1 wt% and temperatures between 1100°C and 1550°C.

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“…Transient methods include the laser flash method, 14,15 the hot wire method, 16 the periodic heat flow method, 17 and the needle probe method. 18 These transient methods have been used to determine the effective thermal diffusivity of glassmelt and retrieve the effective thermal conductivity based on the glassmelt's density and specific heat.…”

Section: Introductionmentioning

confidence: 99%

Conductive and Radiative Properties of Soda‐Lime Silicate Glassmelts with Different Iron Contents from 1100°C to 1500°C

et al. 2016

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This paper presents an inverse method for retrieving (i) the true thermal conductivity, and (ii) the two-band absorption coefficient of soda-lime silicate glassmelts between 1100°C and 1550°C from measured steady-state temperature profiles. This was achieved by combining (i) a forward method solving combined conductive and radiative heat transfer accounting for temperature-dependent thermal conductivity and spectral absorption coefficient and (ii) an inverse method based on genetic algorithm (GA) optimization. Four glassmelt compositions from ultraclear to gray glasses with iron content ranging from 0.008 to 1.1 wt% were investigated. First, it was established that the steady-state temperature in glassmelt can be predicted accurately by averaging the spectral absorption coefficient over two bands from 0 to 2.8 lm and 2.8 to 5.0 lm. The inverse method showed that the true thermal conductivity was independent of the iron content and given by k c (T) = 1.31 + 5.90 3 10 -4T, where T is given in°C. In addition, the band absorption coefficient between 0 and 2.8 lm strongly increased with increasing iron content, while the band absorption coefficient between 2.8-5.0 lm was independent of iron content.

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Thermal conductivity of heat-absorbed soda-lime-silicate glasses at high temperatures

Cited by 10 publications

References 0 publications

Formation of Several-Micrometer-Thick Polycrystalline Silicon Films on Soda Lime Glass by Flash Lamp Annealing

Formation of Several-Micrometer-Thick Polycrystalline Silicon Films on Soda Lime Glass by Flash Lamp Annealing

Effective Thermal Conductivity of Soda‐Lime Silicate Glassmelts with Different Iron Contents Between 1100°C and 1500°C

Conductive and Radiative Properties of Soda‐Lime Silicate Glassmelts with Different Iron Contents from 1100°C to 1500°C

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