Temperature and heating rate effects on tubular alumina filter

The effect of temperature and heating rate on density, pore size, porosity, bending strength and water flux of sintered Al₂O₃ body was studied in this research. Carboxymethyl Cellulose (CMC) 3% by Al₂O₃ weight was used as additive. The Al₂O₃ particle sizes were varied at Al₂O₃ 5 mum and the mixture of Al₂O₃ 0.7 mum (50 wt%) and Al₂O₃ 5 mum (50 wt%). The mixture was then extruded, dried and sintered at 1300degC-1600degC, vary heating rate at 180, 300 and 600degC/Hour. The sintered samples were measured density, porosity, pore size and bending strength. It was found that, particle size is the most important factor affecting density, porosity, pore size and bending strength. The sintering temperature and heating rate affected the density porosity and bending strength of sintered body. The sample prepared from the mixture of Al₂O₃ 0.7 mum (50 wt%) and Al₂O₃ 5 mum (50 wt%) sintered at 1300degC resulted in lowest density and bending strength. The porosity of sintered Al₂O₃ increased with increasing of particle size and decreasing sintered temperature. Increasing heating rate would slightly decrease density and slightly increase pore size and porosity. Therefore, heating rate and sintering temperature are factor affecting on porosity and pore size but particle size is an important factor for both pore sizes and bending strength. The sintered samples were measured bending strength and water flux. The sample prepared from the mixture of 0.7 mum (50 wt%) and 5 mum (50 wt%) with 3% CMC at 1400degC showed bending strength and water flux of 40.50 MPa and 3.7 m³/(m².h), respectively.