Biomedical Engineering Reference
In-Depth Information
types of microstructures; the first was characterized by the creation of large pores
engendering the reaction of hydrolysis of Fap and the second was characterized by the
exaggerated coarsening of grains (Fig. 6b and f). The microstructural analysis of the
composite shows a larger amount of pores, preferentially located on the grain boundaries.
In Fig. 7, the fracture surfaces show clearly the -TCP-26.52 wt% Fap composite as sintered
for 1 h at various temperatures (1300, 1350, 1400 and 1450°C) revealing the influence of the
temperature of microstructural developments during the sintering process. These effects
increased along the sintering temperature. The results of microstructural investigations of -
TCP-26.52 wt% Fap composites show that the morphology of the samples was completely
transformed (Fig. 7a-d).
(a) _______ 5 μm (b) _______ 5 μm
(c) _______ 20 μm (d) _______ 20 μm
Fig. 7. SEM micrograph of β-TCP - 26.52 wt% Fap composites sintered for 1h at: (a) 1300°C,
(b) 1350°C, (c) 1400°C, (d) 1450°C.
At 1300°C, the SEM micrographs of samples show liquid phase relative to the binary
peritectic between pyrophosphate with the tricalcium phosphate (Fig. 7a). At 1350°C, one
notices a partial reduction of the porosity (Fig. 7b). At higher temperatures (1400-1450°C),
the densification was hindered by the formation of both large pores and many cracks (Fig.
7c and d).
Fig. 8A-8B show typical IR spectra of β-TCP sintered for one hour at various temperatures
(1100°C, 1200°C, 1300°C and 1400°C) with 13.26 wt% and 40 wt% Fap, respectively. Most
