Preparation of Al203 - SiCw in-situ composite powder mixtures by carbothermal reduction of kaolinite

Panda, PK and Mariappan, L and Kannan, TS (1998) Preparation of Al203 - SiCw in-situ composite powder mixtures by carbothermal reduction of kaolinite. In: National Seminar on "Composite Materials - Manufacturing Processing, Evaluation, Application, and Technologies" (COMPEAT-98), 19-20 Mar 1998, Jamshedpur, India.

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Abstract

A12O3-SiCw. composite powder mixtures were prepared by carbothermal reduction of kaolinite (A],03.2SiO,.2H,O) in argon atmosphere at constant gas pressure of 0.15 MPa. The reactions were carried out with different mole ratios of silica (in the precursor) and carbon (4.5-9.0), with two types of carbon i.e.carbon black (300m2/g) and activated charcoal (1000m2/g) and at different temperatures in the temperature range of 1550-17000C with one hour of soaking to find the progress of the reaction in all the cases. It was observed that the reactions were complete at 17000C. The reactions were carried out with higher soaking time to optimise the process. It was noted that mullite forms as the intermediate phase at lower temperatures which converts progressively later to a mixture of A12O3 and SiCw composite product at higher temperatures.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Carbothermal reduction;Kaolinite powder
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
CHEMISTRY AND MATERIALS > Composite Materials
Depositing User: Users 11 not found.
Date Deposited: 15 Nov 2012 08:48
Last Modified: 15 Nov 2012 08:48
URI: http://nal-ir.nal.res.in/id/eprint/11346

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