Busca avançada
Ano de início
Entree


Crystallized fraction and crystal size effects on the strength and toughness of lithium disilicate glass-ceramics

Texto completo
Autor(es):
Senk, M. V. ; Mathias, I. ; Zanotto, E. D. ; Serbena, F. C.
Número total de Autores: 4
Tipo de documento: Artigo Científico
Fonte: Journal of the European Ceramic Society; v. 43, n. 8, p. 10-pg., 2023-03-13.
Resumo

This work investigated the variation in fracture strength and toughness of stoichiometric lithium disilicate (LS2) glass-ceramics as a function of crystal size (d) and crystallized volume fraction (f), with three average crystal sizes (8, 13 and 34 mu m) and a wide range of crystallized fractions (0-100 %). The fracture strength and toughness increased with increasing the crystallized volume fraction. For constant crystallized fraction, KIC increased with crystal size, indicating an R-curve behavior. The mean free path between the crystals limits the maximum size of the critical defect and is the crucial feature controlling fracture strength. Finally, we verified that the contribution to the toughness of R-curve mechanisms in this glass-ceramic is proportional to (f.d)1/2, which agrees with R-curve models for ceramics. (AU)

Processo FAPESP: 13/07793-6 - CEPIV - Centro de Ensino, Pesquisa e Inovação em Vidros
Beneficiário:Edgar Dutra Zanotto
Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs