Pengaruh Suhu Tinggi terhadap Karakteristik Keram Cordierite Berbasis Silika Sekam Padi Simon Sembiring, Posman Manurung, Pulung Karo-Karo

Abstract

This study was carried out to investigate the effect of high temperature on the functional groups, microstructure and physical characteristics of cordierite ceramics obtained from an aqueous solution of magnesium nitrate hydrate ((Mg(NO₃)₂.6.12H₂O)), aluminium nitrate hydrate (Al(NO₃)₂.9.15H₂O) and silica sols extracted from rice husk. The samples were sintered at temperature of 1000⁰ C, 1200⁰ C and 1400⁰ C. Functional groups and microstructural characteristics of cordierite ceramics were examined by FTIR and SEM, respectivelly. FTIR study shows that the absence of the vibration bands of Na-OH, Si-OH, C-O, Si-O-Si on the samples. However, the formation of cordierite structure was dominated on this high temperature. Microstructure results confirmed the presence of irregular morphology of the solid and compact phases. In addition, the densities, shrinkage and hardness of cordierite increase significantly with increasing temperature, but porosity decreases with increasing temperature.