The influence of oxygen impurities on the formation of AlN-Al composites by infiltration of molten Al-Mg

Swaminathan, S and Rao, BS and Jayaram, V (2002) The influence of oxygen impurities on the formation of AlN-Al composites by infiltration of molten Al-Mg. In: Materials Science and Engineering A, 337 (1-2). pp. 134-139.

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Abstract

The influence of residual oxygen in nitrogen on the formation of AlN-Al matrix by reactive infiltration has been investigated. Increasing the oxygen content from 10 ppm upwards decreased the nitride content in the matrix from 64 to 6%, Based on the analysis of the availability of oxygen at the Al-melt/gas interface, three distinct scenarios have been proposed (i) at lowest values, oxygen does not interfere with either infiltration or nitridation reaction; (ii) at intermediate values, nitridation is suppressed, however infiltration continues; and (iii) at a critical upper value, the melt passivates without any infiltration. This phenomenon offers control of the AlN/Al ratio in the matrix and the possibility of creation of microstructural gradierits by the appropriate choice of gas mixtures. (C) 2002 Elsevier Science B.V. All rights reserved.

Item Type:	Journal Article
Publication:	Materials Science and Engineering A
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Infiltration;Residual oxygen;Nitridation;AlN
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	27 Jul 2011 06:23
Last Modified:	27 Jul 2011 06:23
URI:	http://eprints.iisc.ac.in/id/eprint/39474

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