Abstract
The properties of biologically active glasses in the system SiO2−P2O5−MgO−CaO were studied. Crystalline hydroxyapatite (HA) and β-wollastonite (β-W) were used after heat treatment (1100°C).
The influence of the glass particle size (0.071–2.5 mm) and of glass powder (d 50=15.1 μm) on the behaviour of the products during differential thermal analysis was followed.
These analyses indicated that the β-W probably originates from surface nucleation, and HA from bulk nucleation.
The differentiation was confirmed by calculation of the Avrami parameters (n) with the Pi-loyan-Borchardt analytical method. For HA and β-W, the calculated values ofn were 2.96 and 1.91. The surface-nucleated glasses exhibited predominant bidimensional crystal growth.
Zusammenfassung
Es wurden die Eigenschaften biologisch aktiver Gläser im System SiO2−P2O5−MgO−CaO untersucht. Nach Wärmebehandlung (1100°C) wurden kristallines Hydroxylapatit (HA) und β-Wollastonit (β-W) verwendet.
Der Einfluß der Glaskorngröße (0.071–2.5 mm) und von Glaspulver (d 50=15.1 m) auf das Verhalten der Produkte bei der DTA wurde beobachtet.
Diese Analyse ergibt, daß ß-W wahrscheinlich einer Oberflächenkeimbildung entspringt, HA dagegen einer Vollkeimbildung.
Diese Unterscheidung wurde durch die Berechnung der Avrami'schen Parameter (n) mit Hilfe der analytischen Methode von Piloyan-Borchardt bestätigt. Die berechneten Werten für HA und ß-W betrugen 2.96 und 1.91. Die über Oberflächenkeimbildung entstandenen Gläser zeigen ein vorherrschendes zweidimensionales Kristallwachstum.
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Illesova, L. Determination of avrami parameters of hydroxyapatite and β-wollastonite in bioactive phosphor—Silica glasses. Journal of Thermal Analysis 44, 589–595 (1995). https://doi.org/10.1007/BF02636278
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DOI: https://doi.org/10.1007/BF02636278