Strengthening of hydroxyapatite by glazing with calcium phosphate glass

Abstract

The aim of this research was to increase the strength of Hydroxyapatite (Hap) prepared from cattle bone ash by inducing compressive surface streass. In this study, the Hap paste was extruded into rod shape specimens, sintered and then characterized. Calcium phosphate (CP) glass was used as a coating material. The glass composition was selected in such a way that it had the appropriate coefficient of thermal expansion by adding Na₂O Coating process was carried out by dipping the sintered specimens in the molten class under controlled temperature and time. The compressive strength of the coated specimens was measured and compared to that of uncoated ones. It was found that the maximum flexural strength of coated Hap with 0.18 mol Na₂O add CP glass was increased to 18.5% (32 MPa) compared with the uncoated specimens.