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Densification kinetics, phase assemblage and hardness of spark plasma sintered Cu–10 wt% TiB2 and Cu–10 wt% TiB2–10 wt% Pb composites

Published online by Cambridge University Press:  22 May 2013

Amit S. Sharma ,
Nisha Mishra ,
Krishanu Biswas  and
Bikramjit Basu
Amit S. Sharma
Affiliation:
Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur–208016, Uttar Pradesh, India
Nisha Mishra
Affiliation:
Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur–208016, Uttar Pradesh, India
Krishanu Biswas
Affiliation:
Department of Materials Science and Engineering, Indian Institute of Technology Kanpur, Kanpur–208016, Uttar Pradesh, India
Bikramjit Basu*
Affiliation:
Materials Research Center, Indian Institute of Science, Bangalore–560012, Karnataka, India
*
a)Address all correspondence to this author. e-mail: bikram@mrc.iisc.ernet.in
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Abstract

The present work demonstrates the synthesis of Cu–10 wt% TiB2 composites with a theoretical density of more than 90% by tailoring the spark plasma sintering (SPS) conditions in the temperature range of 400–700 °C. Interestingly, 10 wt% Pb addition to Cu–10 wt% TiB2 lowers the sinter density and the difference in the densification behavior of the investigated compositions was discussed in reference to the current profile recorded during a SPS cycle. The sintering kinetics and phase assemblage were also discussed in reference to surface melting of the constituents prior to bulk melting temperature, temperature dependent wettability of Pb on Cu, diffusion kinetics of Cu as well as the formation of various oxides. An important result is that a high hardness of around 2 GPa and relative density close to 92% ρtheoretical was achieved for the Cu–10 wt% TiB2–10 wt% Pb composite, and such a combination has never been achieved before using any conventional processing route.

Keywords

spark plasma sinteringcudensification
Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 11 , 14 June 2013 , pp. 1517 - 1528
Copyright
Copyright © Materials Research Society 2013 

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References

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