Effect of Microwave Sintering Temperature on Structure and Mechanical Properties of Hydroxyapatite Ceramics

Ганна Богданівна Товстоног, Олена Євгенівна Сич, Валерій Володимирович Скороход

Abstract


The aim of the paper was to investigate features of microwave sintering of biogenic hydroxyapatite obtained for filling of various bone defects in medicine. The samples were prepared at high-temperature muffle furnace (1,5 kW, 2,45 GHz) at 800, 900, 1000 and 1100 °С. It was established that increasing of microwave sintering temperature did not lead to a rapid increasing of grain size and agglomerate formation. The prepared materials have homogeneous fine-grained structure with average grain size 0,42–0,56 мm and average pore size is equal to 0,5 мm. It was established that the porosity of materials prepared at 800–1000 °С was equal to 40 % and for materials prepared at 1100 °С reduced down to 33 %. The compressive strength increased from 31 to 59 MPa with increasing of temperature and was close to that of cancellous human bone. Studies in vіtro showed that the solubility of the materials in physiological solution did not depend on sintering temperature and was equal to 0,1–0,15 wt. %/day. Thus, the possibility of preparation of ceramics based on biogenic hydroxyapatite by microwave sintering at 800–1100 °C with sufficient structural-mechanical properties for medical use for the substitution of bone defects was shown in the present work.


Keywords


Biomaterial; Calcium phosphate; Hydroxyapatite; Microwave sintering

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DOI: https://doi.org/10.20535/1810-0546.2014.2.52349

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