Venezia, Italy
Venezia, Italy

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Karbay I.H.C.,Technical University of Istanbul | Budakoglu R.,Glass Research Center | Zayim E.O.,Technical University of Istanbul
Applied Surface Science | Year: 2015

This paper aims to enhance the mechanical and optical properties of glass substrates with thin films by the sol-gel method. TiO2-SiO2 binary system and Ta2O5 were deposited on glass substrates with high transparency. Ring-on-ring flexure and scratch tests were the main mechanical characterization tests. Herein, we report that the thin films can be used to enhance the mechanical properties of the glass substrates efficiently and effectively. TiO2-SiO2 binary system shows more than two times and Ta2O5 thin films show nearly three times better ultimate strength in the ring-on-ring flexure test. Besides, Ta2O5 thin film samples show superior scratch resistance. Additionally, the finite element method was also used to check the conformity in the application of mechanical properties of composite materials. It is also worth noting that, the finite element method can be used to accurately analyze the mechanical stability of composite materials. The use of the finite element method can reduce the total number of experimental trials without losing reliability. © 2015.

Ashida T.,Glass Research Center | Kato K.,Glass Research Center | Omoto H.,Glass Research Center | Takamatsu A.,Glass Research Center
Thin Solid Films | Year: 2010

The internal stress, film density and dynamic deposition rate of amorphous tin oxide (SnO 2) films were investigated as a function of the carbon dioxide (CO 2) gas flow ratio [CO 2/(O 2 + CO 2)] during sputter deposition. The internal stress and film density decreased with higher CO 2 gas flow ratios. The dynamic deposition rate increased 1.6-fold with increases in the CO 2 gas flow ratio. These results suggest that the stress relaxation of the SnO 2 films was induced to decrease the interatomic repulsive force with decreases in the film density. Therefore, using CO 2 gas was quite an effective method to reduce the compressive stress of the SnO 2 films. © 2010 Elsevier B.V.

Mognato E.,Glass Research Center | Barbieri A.,Glass Research Center
COST Action TU0905 Mid-Term Conference on Structural Glass - Proceedings of COST Action TU0905 Mid-Term Conference on Structural Glass | Year: 2013

Two of the breakage phenomena of glass panes applied in building and construction work are due to the thermal shock or to the so called "spontaneous" breakage by NiS inclusions. The aim of this paper is to analyse the two above-mentioned aspects. They are not correlated and they refer to different glass products: the thermal shock breakage is generally referred to annealed float glass, whereas the breakage due to NiS (nickel sulfide) inclusion is specific of thermally toughened glass. Thermal shock breakage can be related to design mistakes, spontaneous breakage depends by batch contamination. Specific advices will be outlined to reduce these breakages in glass applications. In both of them the main actor is solar irradiation that, in combination with the glass characteristics (in case of thermal shock), may induce the breakage of glass panes. © 2013 Taylor & Francis Group, London.

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