Ceramics-Silikáty 57, (4) 313 - 318 (2013) |
|
EFFECT OF SINTERING TEMPERATURE ON MICROSTRUCTURE AND IN-VITRO BEHAVIOR OF BIOACTIVE GLASS-CERAMICS
|
Hashmi M. U. 1, Shah Saqlain A. 2, Umer F. 3,
Alkedy Ashraf S. 4
|
1 Department of Applied Sciences, Superior University, Lahore, Pakistan
2 Department of Physics, Forman Christian College, Lahore, Pakistan
3 Department of Basic Sciences, UMT, Sialkot, Pakistan
4 Department of Physics, King Abdulaziz University, Jeddah, KSA,
Egyptian Atomic Energy Authority (EAEA), Cairo, Egypt
|
Keywords: Oxy-acetylene blue flame, Hydroxyapatite HA, Wollastonite, Diameter shrinkage co-efficient, Density
|
In this work, powders of the composition (CaO 46- SiO2 34- P2O5 14.5- MgO 4- CaF2 1- MgF2 0.5) (wt. %) were thoroughly
mixed and melted in a muffle furnace. The melt was quenched in water to form glass. Three glass-ceramics were prepared
by sintering glass samples at three different temperatures 850, 900 and 950oC according to the exothermal peaks of DTA.
The DTA peaks correspond to the bioactive crystalline phases hydroxyapatite(HA) and wollastonite as confirmed by the
XRD data. Study of diameter-shrinkage co-efficient and bulk-density of samples revealed higher densification rate for the
range 900 - 950oC than that for the range 850 - 900oC.SEM and optical microscope results illustrated a tendency towards
closely packed structure and increasing grain size with the increase of sintering temperature. The samples were immersed
in SBF for 30 days at room temperature for in-vitro evaluation.EDS analysis, showing the presence of carbon(C) along
with calcium(Ca) and phosphorus(P) suggests the formation of hydroxycarbonate-apatite(HCA) phase that indicates the
bioactivity of the material which increases with the increase of sintering temperature. |
 PDF (1.8 MB) |
|
