Betül ARSLAN, Nazlı ERKEN, Nuray CANIKOĞLU

Dinamik Termokimyasal Yöntem ile Si3N4/SiC Kompozit Tozunun Üretilmesi

Bu çalışmada, silisyum nitrür/silisyum karbür (Si3N4/SiC) kompozit tozu, 2 adımlı dinamik termokimyasal yöntem ile azot ve argon atmosferlerinde silisyum oksit ve karbonun reaksiyonuyla sentezlenmiştir. Bu amaçla farklı reçeteler hazırlanmış olup nitrürlenme ve karbürlenme sıcaklıkları (1400, 1450 ve 1500°C) ile işlem süresi (1 ve 2 saat) üzerine çalışmalar yapılmıştır. Öncelikle farklı reçeteler FactSage programı yardımıyla termodinamik olarak incelenmiştir. Uygun olabilecek reçeteler belirlendikten sonra hammadde karışımları, SiO2 ve karbon siyahı kullanılarak C/SiO2 oranı 2.25 ve 3 olacak şekilde hazırlanmıştır. Toz karışımlarından elde edilen granüllere uygulanan termokimyasal işlemler sonrasında kompozit toz üretimi için en optimum sonuç, 1450°C’de 2 saat N2 atmosferinde nitrürleme ve 1450°C’de 1 saat Ar atmosferinde karbürleme işlemleriyle 4 rpm dönme hızında sağlanmıştır. Üretilen tozların mikroyapı ve faz incelemeleri SEM-EDS ve XRD yöntemleriyle gerçekleştirilmiştir.

Anahtar Kelimeler:

silisyum nitrür, silisyum karbür, kompozit toz, dinamik termokimyasal yöntem, FactSage

Production of Si3N4/SiC Composite Powder by Dynamic Thermochemical Method

In this study, silicon nitride/silicon carbide (Si3N4/SiC) composite powder was synthesised via the reaction of silicon oxide and carbon in nitrogen and argon atmospheres by 2-step dynamic thermochemical method. For this purpose, different recipes were prepared and studies were carried out on nitriding and carburizing temperatures (1400, 1450 and 1500°C) and processing time (1 and 2 hours). First of all, different recipes were examined thermodynamically with the help of FactSage program. After determining the suitable recipes, raw material mixtures were prepared using SiO2 and carbon black with a C/SiO2 ratio of 2.25 and 3. After the thermochemical processes applied to the granules obtained from the powder mixtures, the optimum result for the production of composite powder was obtained by nitriding in N2 atmosphere for 2 hours at 1450°C and carburizing in Ar atmosphere for 1 hour at 1450°C at a rotational speed of 4 rpm. Microstructure and phase investigations of the produced powders were carried out by SEM-EDS and XRD methods.

Keywords:

silicon nitride, silicon carbide, composite powder, dynamic thermochemical method, FactSage,

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