Influence of compozition and preparation methods on structure and microhardness of hidroxyapatite-bioglass composites M
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POPA (BIVOL), Mihaela, SHIKIMAKA, Olga A., SAVA, Bogdan Alexandru, TARDEI, C., DUMITRU, Marius, BOROICA, Lucica, ŞTEFAN, Rodica. Influence of compozition and preparation methods on structure and microhardness of hidroxyapatite-bioglass composites M. In: Materials Science and Condensed Matter Physics, Ed. 9, 25-28 septembrie 2018, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2018, Ediția 9, p. 157.
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Materials Science and Condensed Matter Physics
Ediția 9, 2018
Conferința "International Conference on Materials Science and Condensed Matter Physics"
9, Chișinău, Moldova, 25-28 septembrie 2018

Influence of compozition and preparation methods on structure and microhardness of hidroxyapatite-bioglass composites M

CZU: 535+538.9+539.1/.2+621.37

Pag. 157-157

Popa (Bivol) Mihaela1, Shikimaka Olga A.1, Sava Bogdan Alexandru2, Tardei C.3, Dumitru Marius2, Boroica Lucica2, Ştefan Rodica4
 
1 Institute of Applied Physics,
2 National Institute for Laser, Plasma and Radiation Physics (INFLPR),
3 ICPE S.A., Bucureşti,
4 Institute of Optoelectronics Bucarest-Magurele
 
Disponibil în IBN: 5 februarie 2019


Rezumat

Hydroxyapatite (HA) - bioactive glass (BG) based composites are widely investigated nowadays due to their application in orthopedic surgery and implants, since HA is the basic mineral compound of the inorganic part of bone and BGs are known to induce higher bioactivity and improved mechanical durability to HA-BG composites. In this work we present a study of HA-BG biocomposites containing a BG of a novel mixed silicophosphate composition and HA prepared by two different methods, sol-gel (HAG) and chemical precipitation (HAP).  We have analyzed the influence of the BG content in the composite (5 and 10 %), the sintering temperature Ts (1200, 1250°C) and the method of HA preparation (HAP and HAG) on the structure (crystallinity, crystallite size, porosity), final composition and mechanical properties of the composites. The following methods were used for this: scanning electron microscopy (SEM) and X-ray diffraction spectroscopy (XRD) for structure analysis, Archimedes method for porosity measurements and microindentation method for mechanical properties investigation.  The higher percentage of glass in combination with higher sintering temperature leads to the transformation of HA in tricalcium phosphate (TCP), which is known to have higher reactivity in the physiological environment in comparison with HA. It was observed a strong correlation between the values of hardness (H) and porosity (Pa): the increase of Pa leads to the decrease of the H values (Fig. 1 a, b). The use of HAP demonstrates higher hardness of composites prepared at the same Ts and BG content (Fig. 1a). This can be explained by the higher compaction capacity of HAP powder in comparison with HAG one (Fig. 1 c, d). The revealed decrease of hardness with the increase of glass content may be connected with the relatively large size of glass particles, which may increase the porosity and as a result, reduce the hardness. The reason of lower H values for composites sintered at higher Ts is assumed to be connected with the HA-TCP transformation.  Although the enhanced porosity leads to the decrease of hardness, it can be a useful property for a bone substituent material, the main aim being the search of an optimal combination of properties for a specific application that can be controlled by changing the composition and the preparation methods.