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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Fracture toughness of silicon carbide, alumina and red clay based ceramics by IF and SEVNB methods

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Author(s):
S. Ribeiro [1] ; G. C. Ribeiro [2] ; J. A. Rodrigues [3]
Total Authors: 3
Affiliation:
[1] Universidade de S. Paulo. Escola de Engenharia de Lorena. Departamento de Engenharia de Materiais
[2] Universidade de S. Paulo. Escola de Engenharia de Lorena. Departamento de Engenharia de Materiais
[3] Universidade Federal de S. Carlos. Departamento de Engenharia de Materiais
Total Affiliations: 3
Document type: Journal article
Source: Cerâmica; v. 60, n. 356, p. 509-515, 2014-12-00.
Abstract

Fracture toughness, K IC, which measuresthe resistance tocrack propagation initiation of a pre-cracked body, is oneof the most importantpropertiesof ceramic materials. The main problemis to selectthe most appropriate methodto determinethis property,since there areseveral ones, each of them with its own characteristics. Normally, for convenience, the indentationmethod is chosen. It is the IF (Indentation Fracture) method, which measures the cracksizeat the verticesof the indentation. However, that methodhas many drawbacks, especially ifthe ceramic material isporous, since itisvery difficulttoidentify the extent of the propagated crack. Themost suitable methodformeasuring fracture toughnessis the SEVNB(Single Edge V NotchBeam). This paper describesK ICresultsfor threedifferent materials: silicon carbide, SiC, alumina, Al2O3, and a clay based ceramics, ceramic tile, with distinctporosities.The results indicate that thevalues of K ICare higherwhen theIF method is used, and the moreporous theceramicsis,the more difficult it is to applythis method. On the other hand, the SEVNB method, regardless porosity, can be applied successfully.The K ICvaluesmeasuredby the SEVNBmethodwere3.8 MPa.m½, 2.5 MPa.m½ and0.4 MPa.m½forSiC, Al2O3and ceramic tile, respectively. (AU)

FAPESP's process: 10/51925-6 - Implementation of the SEVNB method to measure the fracture toughness of liquid phase sintered SiC ceramics using Al2O3-Yb2O3 or Al2O3-Nd2O3 as additives
Grantee:Sebastião Ribeiro
Support Opportunities: Regular Research Grants