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Phase Formation and Thermodynamic Analysis of Self-propagating High-temperature Synthesis Al–Zr–N System Composites

Published online by Cambridge University Press:  31 January 2011

Kexin Chen ,
Changchun Ge  and
Jiangtao Li
Kexin Chen*
Affiliation:
Department of Material Science & Engineering, Tsinghua University, Beijing 100084, People's Republic of China
Changchun Ge
Affiliation:
Laboratory of Special Ceramics & P/M, University of Science and Technology Beijing, Beijing 100084, People's Republic of China
Jiangtao Li
Affiliation:
Laboratory of Special Ceramics & P/M, University of Science and Technology Beijing, Beijing 100084, People's Republic of China
*
a)Address correspondence to this author.
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Abstract

The self-propagating high temperature synthesis (SHS) of Al–Zr–N system composite ceramics was investigated in this paper. The melting point of Al was low (Tm = 660 °C), while that of Zr was high (Tm =1855 °C). Therefore, Al will melt and coalesce during reaction, which inhibit diffusion of nitrogen from outside the metal compact to interior due to collapse of the pore openings, while Zr will not melt under the combustion temperature which is lower than its melting point. It will not affect the permeation of nitrogen under the conditions. Accordingly, the ratio of Al and Zr in the initial mixed powders will affect the permeation of nitrogen from outside the sample to the interior, which results in different phase formation of the products. In this study, the relationship between the combustion parameters and the phase formation of the products will be experimentally determined through XRD analysis, and then thermodynamically analyzed.

Type
Articles
Information
Journal of Materials Research , Volume 13 , Issue 9 , September 1998 , pp. 2610 - 2613
Copyright
Copyright © Materials Research Society 1998

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