| Full text | |
| Author(s): |
Daguano, J. K. M. F.
;
Santos, C.
;
Suzuki, P. A.
;
Bicalho, L. A.
;
Fernandes, M. H. F. V.
;
Rosa, LG
;
Margarido, F
Total Authors: 7
|
| Document type: | Journal article |
| Source: | Materials Science Forum; v. 636-637, p. 2-pg., 2010-01-01. |
| Abstract | |
Glasses based on the 3CaO center dot P2O5-SiO2-MgO system present high bioactivity aiming the use as bone restorations. On the other hand, the low mechanical properties reduce the importance of this glass aiming the use as restoration bulk specimens. In this work, glass-ceramics were obtained by devitrification of this glass using different temperatures. CaCO3, SiO2, MgO and Ca(H2PO4)center dot H2O were used as starting-powders. Powder mixture was milled/homogenized and melted at 1600 degrees C, for 2h and annealed at 700 degrees C for 4h with cooling rate of 3 degrees C/min. Glass specimens of 15x15x50mm(3) were characterized by DTA and XRD analysis. Specimens were heat-treated in different temperatures between 700 degrees C and 1050 degrees C, for 4 hours, obtaining glass-ceramics with different crystallized phase content. Hardness and fracture toughness were determined and correlated with crystalline phase content. The results indicated that crystallization-degree increase with the temperature, and the mechanical properties are improved: Hardness values present increases lower than 20% as function of the crystallization. Fracture toughness may increase 100% as function of temperature (crystallization degree). (AU) | |