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Influence of Zirconia Sol-gel Coatings on the Fracture Strength of Brittle Materials

Published online by Cambridge University Press:  01 June 2005

Estíbaliz Sánchez-González ,
Pedro Miranda ,
Antonio Díaz-Parralejo ,
Antonia Pajares  and
Fernando Guiberteau
Estíbaliz Sánchez-González
Affiliation:
Departamento de Física, Facultad de Ciencias, 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
*
a) Address all correspondence to this author. e-mail: guiberto@unex.es
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Abstract

In this work, the effect of a sol-gel ZrO2–3 mol% Y2O3 thin film on the fracture properties of a variety of brittle substrates was investigated. The results suggest that the film does not have any appreciable influence on the fracture behavior of crystalline substrates but dramatically affects the fracture properties of amorphous layers. In particular, a significant reduction of average fracture strength and a major increase of the Weibull modulus were observed on coated glassy slides. The origin of such variations is attributed to the generation of a homogeneous flaw population in the vitreous substrates, and the possible mechanisms for the production of flaws are analyzed. Implications of these results for the practical use of coated glassy layers are discussed.

Keywords

CeramicStrengthSol-gel
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 6 , June 2005 , pp. 1544 - 1550
Copyright
Copyright © Materials Research Society 2005

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References

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