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Algerian kaolinite used for mullite formation |
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| Authors: | F Sahnoune M Chegaar N Saheb P Goeuriot F Valdivieso |
| Affiliation: | aDepartment of Physics, Ferhat Abbas University, Setif, 19000, Algeria;bDepartment of Manufacturing and Materials Engineering, 53100 International Islamic University Malaysia;cDépartement de Céramiques Spéciales, SMS Center, URA CNRS 1884, 158 Cours Fauriel, Ecole Nationale Supérieure de Mines, F-42023, Saint-Etienne cedex 2, France |
| Abstract: | In the present study, mullite was synthesized through reaction sintering of Algerian kaolinite and high purity alumina. The raw powders were wet ball milled in a planetary ball mill. Powders' morphology and the microstructure of the sintered samples were characterized by means of a scanning electron microscope. An X-ray diffractometer equipped with a heating facility and a differential thermal analyzer were used to follow mullite formation. Cylindrical specimens were produced by uniaxial cold compaction at a pressure of 75 MPa and sintered at different sintering temperatures for different sintering times. The heating rate was 10 °C/min. It was found that Algerian kaolinite was suitable for mullite production through reaction sintering with pure Al2O3. Formation of complete mullite occurred at 1550 °C. A relative density of 94% (of the theoretical density) was achieved at a relatively low sintering temperature of 1600 °C and a sintering time of 4 h. |
| Keywords: | Algerian kaolinite Alumina Mullite Reaction sintering |
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