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Computational modeling of reactive hot pressing of zirconium carbide

Published online by Cambridge University Press:  27 May 2015

Tamoghna Chakrabarti ,
Lingappa Rangaraj  and
Vikram Jayaram
Tamoghna Chakrabarti
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, Karnataka, India
Lingappa Rangaraj
Affiliation:
Materials Science Division, CSIR-National Aerospace Laboratories, Bangalore 560017, Karnataka, India
Vikram Jayaram*
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, Karnataka, India
*
a) Address all correspondence to this author. e-mail: qjayaram@materials.iisc.ernet.in
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Abstract

A model of reactive hot pressing of zirconium carbide (ZrCx , 0.5 < x < 1) has been constructed that incorporates four processes that occur in parallel: creep of zirconium (Zr), reaction of Zr and carbon (C), increase in volume fraction of hard phase with progressive reaction that reduces the creep of Zr and, finally, de-densification associated with volume reduction during reaction. The reasonable agreement of the model with experimental results verifies that plastic deformation of Zr is the main factor that is responsible for the low-temperature reactive densification of ZrC and that ZrC may be treated as a rigid inclusion that contributes little to densification. It predicts that densification is impaired by increasing carbon stoichiometry due to the increasing amount of starting hard phase and the greater contraction upon reaction. Additionally, the model predicts that mixtures of Zr and ZrC should show equal or better densification than Zr and C mixtures.

Keywords

UHTCzirconium carbidereactive hot pressinghot pressingsintering

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Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 12 , 28 June 2015 , pp. 1876 - 1886
Copyright
Copyright © Materials Research Society 2015 

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References

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