High-temperature carboreduction of kaolins of different crystallinity

Dubois, J and Murat, M and Amroune, A and Carbonneau, X and Gardon, R and Kannan, TS (1998) High-temperature carboreduction of kaolins of different crystallinity. Applied Clay Science, 13 (1). pp. 1-12.

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Abstract

The high-temperature 1600x2013;17008C carboreduction of x2018;kaolinrcarbon blackx2019; raw mixture has been processed under argon atmosphere with two kaolins of quite different crystallinity. Although no transition metal catalyst was added, the growth of SiC whiskers SiCw proceeded via the vaporx2013;liquidx2013;solid VLS -like mechanism, due to the well-known particular role played by iron and titanium impurities contained in the raw kaolin samples. This work shows that the whisker yield essentially depends on the crystallinity of high-temperature phases mullite and silica , which is obtained with kaolin having the highest degree of crystallinity. This later observation and complementary experiments made by varying the carbonrkaolin ratio indicate that the carboreduction reaction must be processed with well-crystallized kaolin sample and carbon excess to produce hot-pressed high-strength x2018;aluminarSiC whiskerx2019; ceramic composites.

Item Type:	Article
Additional Information:	Copyright belongs to Elsevier Science
Uncontrolled Keywords:	High-temperature carboreduction;Kaolin;Crystallinity;SiC whiskers
Subjects:	CHEMISTRY AND MATERIALS > Metals and Metallic Materials CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User:	Mr. N A
Date Deposited:	07 Jun 2006
Last Modified:	03 May 2012 10:33
URI:	http://nal-ir.nal.res.in/id/eprint/1468

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