Mechanical properties of barium disilicate glass-ceramics

Reference	Presenter	Authors (Institution)	Abstract
10-017	Simone do Rocio Ferraz Sabino	Sabino, S.d.(State University of Ponta Grossa); Rodrigues, A.M.(Federal University of São Carlos (UFSCar)); Silva, L.D.(Federal University of São Carlos (UFSCar)); Zanotto, E.D.(Federal University of São Carlos (UFSCar)); Serbena, F.C.(State University of Ponta Grossa);	Barium disilicate glass (BaO.2SiO2) is one of the few glass-forming systems that nucleate in the sample interior without the need of nucleating agents. This allows a comprehensive control and design of the microstructure in terms of volume fraction crystallized and crystal size. Also, this glass undergoes stoichiometric crystallization, that is, the crystal composition is the same as that of the glassy matrix, and the growing crystals are axiolitic or spherulitic. The internal crystallization process allows the possibility of improving its mechanical properties, such as hardness, elastic modulus, bending strength and fracture toughness. BaO.2SiO2 is one of the few (model) silicate glass-ceramics for which the mechanical properties have not yet been characterized. Elastic modulus, hardness, fracture toughness, biaxial flexural strength and residual stresses are investigated as a function of crystallized volume fraction and crystal size. The results will be fully discussed in Iguassu Falls.
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