Algerian kaolinite used for mullite formation
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- 作者：F. Sahnoune ; M. Chegaar ; N. Saheb ; P. Goeuriot ; F. Valdivieso
- 关键词：Algerian kaolinite ; Alumina ; Mullite ; Reaction sintering
- 刊名：Applied Clay Science
- 出版年：2008
- 出版时间：February 2008
- 年：2008
- 卷：38
- 期：3-4
- 页码：304-310
- 全文大小：923 K
文摘
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.