Changes in phase composition and mechanical strength during aging of calcium phosphate cements

摘要

The increase of compressiove strength is time and initial pH dependent. Increase of aging time and initial pH leads to the increase of mechanical properties. A compressive strength up to 15 MPa was reached for cements with powder/liquid ratio 1.75g/1ml and initial liquid phase pH 8. More rapid conversion of α-TCP to hydroxyapatite occours at higher liquid phase pH values. The lower compressive strength of cements with acidic initial liquid phase pH can be explained by slower conversion of α-TCP and higher porosity after setting. The best setting and mechanical properties was achieved for cements with basic initial pH(8).