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Received June 10, 2008
Accepted September 22, 2008
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Influence of sintering temperature on microstructural changes of ceramic Raschig ring
Mineral Processing Research Center, Chemical Engineering Department, Sahand University of Technology (SUT), Tabriz, Iran
salem@sut.ac.ir
Korean Journal of Chemical Engineering, March 2009, 26(2), 500-505(6), 10.1007/s11814-009-0085-y
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Abstract
The thermal behavior of Illitic-kaolinitic clay for manufacturing of low porosity ceramic Raschig rings was characterized during the sintering process. The samples were shaped by extrusion method and fired at different temperatures from 1,100 to 1,300 ℃. The main physical-chemical transformations were studied by evaluating changes in shrinkage, water absorption, porosity, mechanical strength, microstructure and mineralogical compositions. The optimum sintering condition was found to obtain maximum mechanical strength. Chemical resistance of ceramic Raschig rings also was determined according standard method. It was shown that the better chemical resistance could be attributed to the different mineralogical compositions, in particular with presence of mullite phase.
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Billet IR, Schultes IM, Chem. Eng. Tech., 16, 1 (1993)
Seibert AF, Fair JR, Ind. Eng. Chem. Res., 32, 2213 (1993)
Strigle Jr. F, Random packing and packed tower, Huston TX; Gulf Publication Co. (1987)
Reed JS, Introduction to principles of ceramic processing, John Wiley & Sons, 2nd ed. New York (1995)
Vieira CMF, Silva PRN, Silva FT, Capitaneo JL, Monteiro SN, Revista Materia, 10, 526 (2005)
Villora JM, Callejas P, Barba MF, Baudin C, J. Eur. Ceram. Soc., 24, 589 (2004)
Carty WM, Senapati U, J. Am. Ceram. Soc., 81, 3 (1998)
Lee S, Kim YJ, Lee HJ, Moon HS, J. Am. Ceram. Soc., 82, 2096 (2001)
Lee WE, Iqbal Y, J. Eur. Ceram. Soc., 21, 2583 (2001)
ASTM-C21: Standard test method for water absorption, bulk density, apparent porosity of fired ceramic, Annual book of ASTM Standards (1995)
ASTM C329-88: Standard test method for specific gravity of fired ceramic whiteware materials, Annual Book of ASTM Standards (1988)
ASTM-C515: Standard specification for chemical-resistant ceramic tower packing, Annual Book of ASTM Standards (1995)
