Vickers Crack Nucleation of Glass Sheets Coated by Thin Silica Gel Layers |
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Authors: | Roberto Dal Maschio Alessandro Pegoretti Caterina Rizzo Gian D. Soraru Giovanni Carturan |
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Affiliation: | Department of Engineering, University of Trento, 38050 Mesiano-Trento, Italy |
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Abstract: | SiO2 gel layers of different thickness have been deposited on glass sheets by dipping from gelling solutions with different concentrations of silicon alkoxide. Some mechanical properties of the coated samples such as hardness (H), elastic modulus (E), crack formation tendency, and tensile stress in the film (σ) have been measured by microindentation techniques and slide deflection. SiO2 films deposited from more dilute solutions had lower H, E, and σ values, accounting for the observed higher resistance to crack nucleation in comparison with that found for samples prepared from more concentrated solutions. |
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Keywords: | sol—gel coatings mechanical properties silica hardness |
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