Fabrication of dense cordierite ceramic through reducing Al_2O_3 mole ratio

摘要

Dense cordierite ceramic was fabricated through reducing Al_2O_3 mole ratio from 2.0 to 1.4. The effect of the content of Al_2O_3 on crystalline phases, sintering characteristics and microstructures were studied. The green bodies, made of kaolin, attapulgite and basic magnesium carbonate, were sintered at 1200 ℃. The result suggests that reducing the Al_2O_3 mole ratio can fabricate dense cordierite ceramic. At 1200 ℃, cordierite became the main crystallization phase with a little of sapphirine. With the Al_2O_3 mole ratio decreasing, the shrinkage and bulk density increased but porosity reduced. When the mole ratio of Al_2O_3 reduced to 1.4 and sintered at 1200 ℃, the bulk density tends to the maximum value of 2.50 kg/m~3.