Mechanical and Structural Properties of Graphene-Si3N4 Reinforced Hydroxyapatite Nanocomposites

Öz

It is known that hydroxyapatite is similar to the inorganic structure of bones and teeth. However, the use of pure HA in bone-tooth implants is limited because it has low mechanical properties. To overcome this problem, composites can be formed with various bio-ceramics. In this study, it was aimed to produce a new biocompatible composite material with high mechanical strength by adding different amounts of graphene and a constant amount of Si3N4 to HA. 5 different Hydroxyapatite-Silicon Nitride-Graphene bio composites with different reinforcement ratios were turned into pellets with the help of a single-axis press and sintered at 1 100 oC for 2 hours to gain final strength. The densities of the samples were determined according to the Archimedes principle, the microstructure was analysed by scanning electron microscopy (SEM) and the formed phases were determined by XRD analysis. In addition, the hardness of the samples was measured with Microvickers. As a result of the studies, it was determined that the hardness and density values increased by adding graphene and Si3N4 to HA. In addition, mechanisms that increase fracture toughness were observed in SEM images.

Anahtar Kelimeler

• Biomaterial
• hydroxyapatite
• composites
• mechanical properties
• hardness

Grafen-Si3N4 Takviyeli Hidroksiapatit Nanokompozitlerin Mekanik ve Yapısal Özellikleri

Öz

Hidroksiapatitin (HA) kemik ve dişlerin inorganik yapısına benzerlik gösterdiği bilinmektedir. Fakat düşük mekanik özelliklere sahip olduğu için saf haldeki HA’nın kemik-diş implantlarında kullanımı sınırlıdır. Bu sorunun üstesinden gelmek için çeşitli biyo seramikler kullanılarak kompozit oluşturulabilir. Bu çalışmada HA’ya farklı miktarlarda grafen ve sabit miktarda Si3N4 takviye edilmesiyle yüksek mekanik dayanıma sahip ve biyouyumlu yeni bir kompozit malzeme üretilmesi amaçlanmıştır. Farklı miktarlarda takviye oranlarına sahip 5 farklı Hidroksiapatit- Silisyum Nitrür- Grafen biyokompozitler tek eksenli pres yardımıyla pellet haline getirilmiş ve nihai mukavemeti kazanması içinde 1100 °C sıcaklıkta 2 saat sinterlenmiştir. Numunelerin yoğunlukları Arşimet prensibine göre belirlenmiş, mikro yapısı taramalı elektron mikroskobu (SEM) ile analiz edilmiştir ve oluşan fazlar XRD analizi ile tespit edilmiştir. Ayrıca numunelerin sertlikleri Microvickers ile ölçülmüştür. Yapılan çalışmalar sonucunda HA’ya grafen ve Si3N4 takviye edilmesiyle sertlik ve yoğunluk değerlerinin arttığı tespit edilmiştir. Ayrıca SEM görüntülerinde kırılma tokluğunu arttıran mekanizmalar gözlemlenmiştir.

Anahtar Kelimeler

• Biyomalzeme
• hidroksiapatit
• kompozitler
• mekanik özellikler
• sertlik

Kaynakça

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