Investigation of the Effect of Sintering Additive on the Microstructure and the Antibacterial Behavior of Reaction Bonded Silicon Nitride Ceramics

Year 2021, Volume: 13 Issue: 2, 375 - 381, 18.06.2021

Şeniz Reyhan Kuşhan Akın

https://doi.org/10.29137/umagd.793123

Abstract

Silicon nitride (Si3N4) is a superior non-oxide ceramic material generally preferred for high temperature and structural applications. Besides being a very hard material, it is also possible to achieve relatively high toughness values among the ceramic materials by the formation of elongated beta () grains. In addition to these properties, by the understanding of its biocompatibility, the studies to increase the application potential of these materials as bio ceramics is also increased in the last decade. In this study, production of porous Si3N4 ceramics which is advantageous by means of the integration of these materials with the surrounding biological tissue was aimed using reaction bonding technique. The effect of CaO, Y2O3 ve CeO2 sintering additives on the physical and microstructural properties and as a result of these two facts, the antibacterial behavior was investigated. Obtained results revealed that CeO2 is a disadvantageous and Y2O3 is an advantageous sintering additive for both the E. coli and S. aureus bacteria. CaO system is resulted in decreased bacterial poliferation for E. coli and increased poliferation for S. aureus.

Keywords

Si3N4, Reaction bonding, Sintering additive, Antibacterial property

Project Number

2219

Reaksiyon Bağlı Silisyum Nitrür Seramiklerinde Sinterleme İlavesinin Mikroyapı ve Antibakteriyel Davranışa Etkisinin İncelenmesi

Abstract

Silisyum Nitrür (Si3N4) genellikle yüksek sıcaklık ve yapısal uygulamalarda tercih edilen, üstün özellikli bir oksit dışı seramiktir. Çok sert bir malzeme olmasının yanı sıra, çubuksu beta () tanelerin gelişimi ile seramik malzemeler içinde yüksek kabul edilebilecek tokluk değerleri elde etmek mümkün olabilmektedir. Bu özelliklerine ilave olarak biyo uyumluluğunun da anlaşılması ile birlikte özellikle, bu malzemenin biyoseramik olarak kullanım potansiyelini arttırmak amacıyla son on yılda yapılan çalışmaların sayısı da artmıştır. Bu çalışmada da reaksiyon bağlama tekniği ile, çevre biyolojik dokularla entegrasyon açısından avantajlı olan gözenekli Si3N4 seramiklerinin üretilmesi amaçlanmıştır. Sinterleme ilavesi olarak sisteme yapılan CaO, Y2O3 ve CeO2 katkılarının, elde edilen Si3N4 seramiklerin fiziksel ve mikroyapısal özelliklerine ve bunların sonucu olarak antibakteriyel davranışlarına etkileri incelenmiştir. Elde edilen sonuçlar CeO2’in hem E. coli hem de S. aureus açısından dezavantajlı bir sinterleme ilavesi olduğunu, Y2O3’in ise en avantajlı ilave olduğunu görülmüştür. CaO ilavesi yapılan sistem ise E. coli için düşük, S. aureus için yüksek oranda bakteri üremesi ile sonuçlanmıştır.

Keywords

Si3N4, Reaksiyon bağlama, Sinterleme ilavesi, Antibakteriyel özellik

Supporting Institution

TÜBİTAK

Project Number

2219

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