Crystallization kinetics and heat treatment temperature on microstructure and properties of Na2O-CaO-P2O5 bioactive glass system. (November 2018)

• Record Type: Journal Article
• Authors: Intawin, Pratthana; Eitssayeam, Sukum; Tunkasiri, Tawee; Pengpat, Kamonpan
• Is Part Of: Ceramics international. Volume 44(2018)Supplement 1
• Page Start: S203
• Page End: S206
• Publication Date: 2018-11
• Subjects: Crystallization kinetics -- Heat treatment temperature -- Na2O-CaO-P2O5 glass system; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.08.114
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: This study deals with the effects of heat treatment temperature on the thermal and mechanical properties of Na2 O-CaO-P2 O5 glasses and glass-ceramics. The major crystalline phase was calcium phosphate along with sodium calcium phosphate as the minor crystalline phases presented in the glass-ceramics. Vickers hardness, Knoop hardness and Young's modulus values of the glass-ceramics decrease with increasing of heat treatment temperature, however, the opposite trend is found for the fracture toughness values. H550 sample confirms the dendritic-like structure, H600 and H650 samples confirms the lamellar bone-like structures and H700 sample confirms the scaffold-like structure. The microstructure, with cluster of dendritic crystal and lamellar structure, indicates a typical two-dimensional crystallization mechanism, which agrees with the above analysis of Avrami exponent ( n = 2.8) for glass sample at T p1 while scaffold structure indicates a typical three-dimensional crystallization mechanism, which is in good agreement with the above analysis of Avrami exponent ( n = 4.2) for glass sample at T p2 . Moreover, all Na2 O-CaO-P2 O5 bioactive glass-ceramics are not toxic to the living cell and have a good bioactive property.