resumo
The sintering and crystallization behaviours of alkali-free bioactive glass compositions designed in the diopside (CaO center dot MgO center dot 2SiO(2))-tri-calcium phosphate (3CaO center dot P2O5) binary join by varying the Di/TCP ratios were investigated by hot-stage microscopy and differential thermal analysis, respectively. The effects of non-isothermal heating for 1 h at 900, 1000 and 1200 degrees C on the structural changes were assessed by solid-state magic angle spinning nuclear magnetic resonance (MAS-NMR) and crystalline phase assemblage. The influence of the heat treatment temperature on 3 point bending strength was also investigated. Diopside and hydroxyapatite formed as primary crystalline phases, accompanied by calcium silicate as secondary phase, in samples are sintered at 900 degrees C and 1000 degrees C. With further increase of the heat treatment temperature to 1200 degrees C, whitlockite that was stated appearing in some compositions at 1000 degrees C, appeared as main crystalline phase after diopside as a result of hydroxyapatite transformation. The data gathered was highly relevant towards setting the experimental conditions required for preparing well sintered and mechanically strong glass/glass-ceramic scaffolds for bone regeneration and tissue engineering applications. (C) 2015 Elsevier B.V. All rights reserved.
palavras-chave
BIOCERAMICS; WHITLOCKITE; VISCOSITY
categoria
Materials Science
autores
Kapoor, S; Goel, A; Pascual, MJ; Ferreira, JMF
nossos autores
José Maria da Fonte Ferreira
Professor Associado com Agregação
Saurabh Kapoor
Estudante de doutoramentoagradecimentos
This work was supported by the European Regional Development Fund (FEDER) under the PT2020 Partnership Agreement through the COMPETE, by the Portuguese Government through the Portuguese Foundation for Science and Technology (FCT), in the scope of the projects UID/CTM/50011/2013 (Aveiro Institute of Materials, CICECO, www.ciceco.ua.pt) and the fellowship grant Reference PTDC/CTM/99489/2008.