Abstract
Monoclinic zirconia and hydroxyapatite (HA) composites with or without 5 wt% YF 3 were synthesized to investigate their mechanical properties and phase stability. HA decomposed to tri-calcium-phosphate and CaZrO 3 in the 25 wt% ZrO 2–75 wt% HA composite. However, thermal stability of the phases, densification, hardness and fracture toughness were improved when 5 wt% YF 3 was added into the system. Five weight percent YF 3 increased the transformation of monoclinic-ZrO 2 into tetragonal/cubic-ZrO 2 by incorporating the Y 3+ ions present in YF 3 when the hot pressing temperature was increased from 1100 to 1200 °C. Moreover, the stability of HA was also improved by incorporating the F − ions from YF 3 in the place of OH − ions in HA. Substitution of OH − by F − ions was verified by the change in HA's hexagonal lattice parameters. A fracture toughness of 1.93 MPa√m was calculated for the same composite.
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