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New technique for pressureless infiltration of Al alloys into Al2O3 preforms

Published online by Cambridge University Press:  31 January 2011

B. Srinivasa Rao  and
V. Jayaram
B. Srinivasa Rao
Affiliation:
Department of Metallurgy, Indian Institute of Science, Bangalore-560 012, India
V. Jayaram
Affiliation:
Department of Metallurgy, Indian Institute of Science, Bangalore-560 012, India
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Abstract

Al alloys were infiltrated into alumina preforms without the aid of pressure in N2 as well as in air at and above 750 °C. It was possible to eliminate termination of infiltration that was seen in open conditions (where N2 was in continuous contact with the melt) by modifying the infiltration geometry. This configuration enables the infiltration to continue for longer periods of time, consequently producing greater thickness of composite. In air, Mg placed at the interface getters the in-coming oxygen until the alloy billet melts and seals off the front from the ingress of the furnace atmosphere thereby eliminating the need for prealloying Al with Mg and N2 atmosphere. In addition, experiments in argon revealed that the infiltration requires some critical amount of N2 in the atmosphere.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 10 , October 2001 , pp. 2906 - 2913
Copyright
Copyright © Materials Research Society 2001

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