Abstract
Nanophase alpha-alumina and hydroxyapatite composites (with and without 5wt% AlF3, CaF2 or MgF2, added separately) were hot pressed at 1100°C and 1200°C to investigate their mechanical properties and phase stability. Hydroxyapatite slightly decomposed to tri-calcium-phosphate when there was no F− present. With the addition of AlF3, CaF2 or MgF2 into the composite, it improved its thermal stability and mechanical properties. Substitution of OH− by F− ions in hydroxyapatite was verified by the change in hydroxyapatite's hexagonal lattice parameters and unit cell volume. A fracture toughness of 2.8MPam and μ-hardness of 8.25GPa were calculated for the composite containing CaF2 after the hot pressing at 1200°C.
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