Ti3SiC2 MAX FAZININ ELEMENTEL TOZ KULLANILARAK SENTEZİ

MAX seramik ailesinde en dikkat çeken ve üzerinde en fazla araştırma yapılan sistem Ti-Si-C sistemi ve 312 yapısıdır. Ti3SiC2 fazı farklı başlangıç malzemeleri kullanılarak üretilmektedir. Kullanılan malzemelere bağlı olarak, üretim parametreleri ve yöntemleri farklılık göstermektedir. Bu çalışmada, titanyum, silisyum ve karbon kullanılarak, hazırlanan stiokiometrik karışımdan yüksek safiyette Ti3SiC2 fazının sentezi çalışılmıştır. Kullanılan başlangıç karışımları ve elde edilen reaksiyon ürünleri SEM, XRD, XRF, TG/DTA gibi analiz yöntemleriyle analiz edilmiştir. Deneysel sonuçlara göre, başlangıç karışımında bulunan silisyum miktarı önemlidir. X-ışınları analizi göstermiştir ki; 1350˚C'de ve iki saat sinterleme süresinden sonra yapıda 312 MAX fazı oluşmaktadır. Ortamda bulunan karbon kilit role sahiptir ve fazla karbonun bulunması halinde oluşan MAX fazı, yüksek sıcaklılarda ikili karbür yapısına dönüşmektedir.

Anahtar Kelimeler:

MAX Fazı, Seramik Sistemler, İşlenebilir Seramikler, Ti3SiC2, SEM

SYNTHESIS OF Ti3SiC2 MAX PHASE FROM ELEMENTAL POWDERS

In MAX phase material family, Ti-Si-C system and especially 312 Ti3SiC2 phase is the most attracted and investigated structure. It can be produced from different methods. As expected, each method differs processing methods, experimental conditions and parameters depending on the starting composition. In this article, the processing of high purity Ti3SiC2 phase was studied using Ti, Si and C powders. The powders were mixed in stoichiometric ratio to obtain pure Ti3SiC2 phase. Both of the initial and the obtained product samples were characterised using SEM, XRD, XRF, TG/DTA methods. The results showed that, the silicon content was important and carbon plays critical role. X-ray diffraction analysis showed that the 312 TiSiC phases was formed after the sintering at temperature of 1350 ˚C for 2 h. If excess carbon is present in the system, the formed MAX phase was converted into binary carbide phases.

Keywords:

MAX Phase, Ceramic Systems, Machinable Ceramics, Ti3SiC2, SEM,

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