Effect of AlF3, CaF2 and MgF2 on hot-pressed hydroxyapatite-nanophase alpha-alumina composites

2008-10-02
Evis, Zafer
Doremus, Robert H.
Nanophase alpha-alumina and hydroxyapatite composites (with and without 5 wt% AlF3, CaF2 or MgF2 added separately) were hot pressed at 1100 degrees C and 1200 degrees C to investigate their mechanical properties and phase stability. Hydroxyapatite slightly decomposed to tri-calciurn-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 2.8 MPa root m and mu-hardness of 8.25 GPa were calculated for the composite containing CaF2 after the hot pressing at 1200 degrees C.

Citation Formats
Z. Evis and R. H. Doremus, “Effect of AlF3, CaF2 and MgF2 on hot-pressed hydroxyapatite-nanophase alpha-alumina composites,” MATERIALS RESEARCH BULLETIN, vol. 43, no. 10, pp. 2643–2651, 2008, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/40046.