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

Yıl 2019, Cilt: 31 Sayı: 4, 295 - 304, 01.11.2019

Süleyman Serdar Pazarlıoğlu

https://doi.org/10.7240/jeps.512240

Cited By: 2

Öz

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. 

Anahtar Kelimeler

Hidroksiapatit, Sinterleme, Seryum

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

Öz

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. 

Anahtar Kelimeler

Hydroxyapatite, cerium oxide, Sintering

Kaynakça

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