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Effect of cerium oxide (CeO 2 ) additive on the microstructure, mechanical and invitro bioactivity properties of a commercially synthetic hydroxyapatite (HA) was investigated. HA without CeO 2 started to decompose at 1100 o C, but the decomposition temperature of the CeO 2 added samples decreased up to 900 o C. Decomposition rate of the sintered samples increased as the sintering temperature reached to 1300 o C. It was about 5.8% for monolithic HA, and increased to 11.4% when the CeO 2 additive to HA reached to 2.5 wt%. SEM images showed that an excessive grain growth as well as microcracks occured on the surface of monolithic HA when it was sintered at the temperatures than that of 1100 o C. The microcracks were also observed on the surface of HA-CeO 2 composites, when they were sintered at 1300 o C. The composite of HA-0.5CeO 2 sintered at 1100 o C possess the higher fracture toughness (Kic) (2.510 ± 0.225 MPam 1/2 ) and the higher compressive strength (152.73 ± 6.31 MPa) compared to other HA-CeO 2 composites, and it's mechanical properties are higher than that of monolithic HA at about 2-3 times. In-vitro bioactivity test results showed that apatite layers on the surface of the samples were in the different morphologies.

Hidroksiapatit / seryum oksit kompozitleri: Sinterleme, mikroyapısal, mekanik ve invitro biyoaktivite özellikleri