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Temperature and heating rate effects on tubular alumina filter
Tanikan Thongchai,Siriporn Larpkiattaworn 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
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 Al2O35 μm and the mixture of Al2O30.7 μm (50 wt%) and Al2O35 μm (50 wt%). The mixture was then extruded, dried and sintered at 1300°C-1600°C, vary heating rate at 180, 300 and 600°C/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 Al2O30.7 μm (50 wt%) and Al2O35 μm (50 wt%) sintered at 1300°C 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 μm (50 wt%) and 5 μm (50 wt%) with 3% CMC at 1400°C showed bending strength and water flux of 40.50 MPa and 3.7 m3/(m2.h), respectively.
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