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Effect of Sol-Gel Thin Coatings on the Fracture Strength of Glass

Published online by Cambridge University Press:  03 March 2011

Estíbaliz Sánchez-González
Affiliation:
Departamento de Electrónica e Ingeniería Electromecánica, Escuela de Ingenierías Industriales, Universidad de Extremadura, 06071 Badajoz, Spain
Pedro Miranda
Affiliation:
Departamento de Electrónica e Ingeniería Electromecánica, Escuela de Ingenierías Industriales, Universidad de Extremadura, 06071 Badajoz, Spain
Antonio Díaz-Parralejo
Affiliation:
Departamento de Electrónica e Ingeniería Electromecánica, Escuela de Ingenierías Industriales, Universidad de Extremadura, 06071 Badajoz, Spain
Antonia Pajares
Affiliation:
Departamento de Física, Facultad de Ciencias, Universidad de Extremadura, 06071 Badajoz, Spain
Fernando Guiberteau
Affiliation:
Departamento de Electrónica e Ingeniería Electromecánica, Escuela de Ingenierías Industriales, Universidad de Extremadura, 06071 Badajoz, Spain
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Abstract

The effect of ZrO2–3 mol/ Y2O3 sol-gel thin coatings on the fracture of soda-lime glass is investigated. For this purpose, a recently developed strength measurement procedure—based on making a brittle material flex on top of a soft substrate by applying a load with a spherical indenter to the top surface of the system—is used. Results suggest significant variation of both the average fracture strength and the Weibull modulus on coated glass slides. It is suggested that the origin of such variations can be attributed to a certain chemical degradation of the glass during the coating process. This chemical attack produces a highly homogeneous flaw population on the glass surface which governs its fracture behavior. Implications of this work for the practical use of coated glass layers are discussed.

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Articles
Copyright
Copyright © Materials Research Society 2004

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