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Effect of crystallinity on crack propagation and mineralization of bioactive glass 45S5

Bioactive glasses are a type of ceramic material designed to be used as bioresorbable therapeutic bone implants. Thermal treatment of bioactive glass ceramics dictates many important features such as microstructure, degree of crystallinity, mechanical properties, and mineralization. This study investigates the effects of temperature, time, and heating rates on the crystallization kinetics of melt cast bioactive glass 45S5. Bulk crystallization (three dimensional crystallite formation) was found to always occur in bulk bioactive glass 45S5 irrespective of the processing conditions. A comparative study of crack paths in amorphous and crystalline phases of bioactive glass 45S5 revealed crack deflections and higher fracture resistance in partially crystallized bioactive glass. Such toughening is likely attributed to different crystallographic orientations of crystals or residual thermal mismatch strains. Furthermore, in vitro immersion testing of partially crystalline glass ceramic revealed higher adhesion capabilities of the mineralized layer formed on amorphous regions as compared to its crystalline counterpart. / Materials Engineering

Identiferoai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:AEU.10048/1330
Date11 1900
CreatorsKashyap, Satadru
ContributorsNychka, John A. (Chemical and Materials Engineering), Nychka, John A. (Chemical and Materials Engineering), Gerlich, Adrian (Chemical and Materials Engineering), Luth, Robert (Earth and Atmospheric Sciences)
Source SetsLibrary and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada
Languageen_US
Detected LanguageEnglish
TypeThesis
Format9909417 bytes, application/pdf
RelationMaterials Science and Engineering:C (Elsevier) (2010) http://dx.doi.org/10.1016/j.msec.2010.06.019

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