Geopolimerlerden Mekanokimyasal Aktivasyon ile Silisyum Karbür Tip Nano Parçacıkların Üretilebilirliğinin Araştırılması

Mekanokimyasal olarak 6, 12, 24, 48 saat süreyle aktive edilen ve M= (Na+ veya K+) olmak üzere, sodyum veya potasyum alkali metal içeren (M2O•Al2O3•4.5SiO2•12H2O+18C) geopolimer karbon kompozisyonlarının karbotermal reaksiyonu ile silisyum karbür (SiC) tip nanoparçacıklar elde edilmiştir. Aktivasyon süresi ve alkali şartlara bağlı olarak elde edilen SiC, faz analizi, parçacık boyutu ve şekli ve nanoyapı açısından XRD, rietveld arıtımı, SEM ve TEMSAD analizleri ile karakterize edilmiştir. Sonuçlar, sodyum geopolimerde mekanokimyasal aktivasyon süresinin artışı ile beraber 24 saate kadar SiC miktarının arttığını ve 48 saatte azaldığını, potasyum geopolimer durumunda ise süre artışına bağlı olarak genelde hızlı bir azalma olduğunu göstermiştir. Yüksek saflıkta SiC eldesi kritik 24 saat sodyum geopolimerde, ~% 98.4 oranında gerçekleşmiştir. Mikro yapı ise çoğunlukla kristalize olmuş, 50-200 nm çapında ve uzunlukları 2-10 µm arasında değişen nano fiber, geri kalanı ise küresel nano-parçacıklar ve çok az amorf camsı fazdan oluşmaktadır.

Anahtar Kelimeler:

Geopolimer, mekanokimyasal, SiC nano-fiber

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