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

Abstract

Effect of cerium oxide (CeO₂) additive on the microstructure, mechanical and invitro bioactivity properties of a commercially synthetic hydroxyapatite (HA) was investigated. HA without CeO₂ started to decompose at 1100 ^oC, but the decomposition temperature of the CeO₂ added samples decreased up to 900 ^oC. Decomposition rate of the sintered samples increased as the sintering temperature reached to 1300 ^oC. It was about 5.8% for monolithic HA, and increased to 11.4% when the CeO₂ 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 ^oC. The microcracks were also observed on the surface of HA-CeO₂ composites, when they were sintered at 1300 ^oC. The composite of HA-0.5CeO₂ sintered at 1100 ^oC possess the higher fracture toughness (Kıc) (2.510 ± 0.225 MPam^1/2) and the higher compressive strength (152.73 ± 6.31 MPa) compared to other HA-CeO₂ 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. 

Keywords

• Hidroksiapatit
• Sinterleme
• Seryum

Hydroxyapatite/cerium oxide composites: Sintering, microstructural, mechanical and invitro bioactivity properties

Abstract

Effect of cerium oxide (CeO₂) additive on the microstructure, mechanical and invitro bioactivity properties of a commercially synthetic hydroxyapatite (HA) was investigated. HA without CeO₂ started to decompose at 1100 ^oC, but the decomposition temperature of the CeO₂ added samples decreased up to 900 ^oC. Decomposition rate of the sintered samples increased as the sintering temperature reached to 1300 ^oC. It was about 5.8% for monolithic HA, and increased to 11.4% when the CeO₂ 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 ^oC. The microcracks were also observed on the surface of HA-CeO₂ composites, when they were sintered at 1300 ^oC. The composite of HA-0.5CeO₂ sintered at 1100 ^oC possess the higher fracture toughness (Kıc) (2.510 ± 0.225 MPam^1/2) and the higher compressive strength (152.73 ± 6.31 MPa) compared to other HA-CeO₂ 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. 

Keywords

• Hydroxyapatite
• cerium oxide
• Sintering

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