Nano Hidroksiapatit-Magnezyum Oksit Biyokompozitlerin Mikroyapısal ve Mekanik Özellikleri

AKÜ FEMÜBİD 19 (2019) Özel Sayı (483-487) AKU J. Sci. Eng. 19 (2019) Special Issue (483-487)


Anahtar kelimeler Hidroksiapatit, Nano,Biyokompozit, Magnezyum Oksit, Mekanik Özellikler, Mikroyapı
Öz Hidroksiapatit (HA) ideal biyoaktif malzemedir. Ayrıca, HA iyi biyouyumluluk ve mükemmel osteoiletkenlik göstermektedir. Kimyasal bileşimi ve yapısı, doğal kemik mineralli matrise çok benzemektedir. Nano hidroksiapatitin tane boyutunun kemikteki apatit minerallerine çok benzemesi nedeniyle nano hidroksiapatit üzerindeki araştırmalar büyük önem kazanmıştır. Bu çalışmada, ticari nano hidroksiapatitin mekanik özelliklerini arttırmak için nano magnezyum oksit (nMgO) takviye malzemesi olarak kullanılmıştır. Ağ.% 80 nHA-ağ.% 20 nMgO (nMH1) ve ağ.% 70 nHA-ağ.% 30 nMgO (nMH2) toksik olmayan bağlayıcı içeren kompozitler pres kullanılarak şekillendirildi. Kompozitler 1000 ve 1100°C’de 2 saat süre ile sinterlendi, sonra nano kompozitlerin mikroyapıları ve mekanik özellikleri araştırıldı. Fiziksel ve mekanik özellikler yoğunluk, pişme küçülmesi, basma mukavemeti ve Vickers mikrosertlik (HV) ölçümleri ile tanımlandı. Yapısal karakterizasyon X-ışını kırınımı (XRD) ve taramalı elektron mikroskobu (SEM) ile ortaya kondu. Nano kompozitlerin mekanik özellikleri artan sıcaklık ve MgO ilavesi ile arttı.


Microstructural and Mechanical Properties of Nano HydroxyapatiteMagnesium Oxide Biocomposites
Keywords Hydroxyapatite, Nano, Biocomposite, Magnesium Oxide, Mechanical Properties, Microstructure
Abstract Hydroxyapatite (HA) is an ideal bioactive material. Moreover, HA shows good biocompatibility and excellent osteoconductivity. Its chemical composition and structure are very similar to the mineralized matrix of natural bone. Due to the resemblance of grain sizes of nano hydroxyapatite to that of apatite minerals in bone, the researches of nano hydroxyapatite have become to gain great importance. In this study, in order to improve the mechanical properties of commercial nano hydroxyapatite (nHA), nano magnesium oxide (nMgO) was used as a reinforcement material. 80 wt% nHA-20 wt% MgO (nMH1) and 70 wt% nHA -30 wt% MgO (nMH2) nano composites including nontoxic binder were shaped by using press. The composites were sintered at 1000 and 1100°C for 2 hrs, then microstructures and mechanical properties of nano composites were investigated. The physical and mechanical properties were determined by measuring density, firing shrinkage, compression strength and Vickers microhardness (HV). Structural characterization was carried out with X-ray diffraction (XRD) and scanning electron microscopy (SEM). Mechanical properties of nano composites were increased with increasing temperature and increasing MgO addition.

© Afyon Kocatepe Üniversitesi

Acknowledgements

“The authors would like to thank Kocaeli University Research Project Department (Grant No: 2018/057) for providing financial support

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