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A micromechanistic model of the combined combustion synthesis-densification process

Published online by Cambridge University Press:  03 March 2011

Yangsheng Zhang
Affiliation:
Institute for Self-Propagating High-Temperature Synthesis, New York State College of Ceramics at Alfred University, Alfred, New York 14802-1296
Gregory C. Stangle
Affiliation:
Institute for Self-Propagating High-Temperature Synthesis, New York State College of Ceramics at Alfred University, Alfred, New York 14802-1296
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Abstract

A series of computer experiments has been conducted in order to study the combined combustion synthesis-densification process, in which a mechanical load is applied to a sample as it undergoes a combustion synthesis process. The current work is an extension of a theoretical model of the combustion synthesis process that was developed previously.1,2 In this work, the appropriate constitutive equations for sample deformation have been incorporated, in order to account for the pore-volume change that may take place when the mechanical load is applied, thus densifying the sample. It was shown that the brief appearance of a liquid phase in the combustion wave front provides an important opportunity for densification when the self-propagating combustion synthesis process is conducted in conjunction with an applied mechanical load. That is, the concomitant decrease in the (local) total volume fraction of the solid phases—due to the elementary melting and dissolution processes that also occur (locally)—effectively lowered the (local) apparent yield strength of the sample, thus allowing for the compaction and densification of the sample (i.e., locally). Results indicated that the mechanical load should be applied at the instant at which the sample is ignited, in order to ensure that articles whose density is uniform throughout the sample can be fabricated. This work provided a more detailed and quantitative understanding of this unique process for preparing dense articles by the self-propagating combustion synthesis process, that is, when it is conducted in conjunction with an applied mechanical load.

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Articles
Copyright
Copyright © Materials Research Society 1995

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References

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