Swaminathan, S. ; Rao, B. Srinivasa ; Jayaram, V. (2002) The influence of oxygen impurities on the formation of AlN-Al composites by infiltration of molten Al-Mg Materials Science and Engineering: A - Structural Materials - Properties, Microstructure and Processing, 337 (1-2). pp. 134-139. ISSN 0921-5093
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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S09215...
Related URL: http://dx.doi.org/10.1016/S0921-5093(02)00002-3
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 gradients by the appropriate choice of gas mixtures.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | Infiltration; Residual Oxygen; Nitridation; AlN |
| ID Code: | 13592 |
| Deposited On: | 12 Nov 2010 15:17 |
| Last Modified: | 04 Jun 2011 07:10 |
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