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Continuum modeling of B4C densification during Spark Plasma Sintering

Published online by Cambridge University Press:  13 June 2017

Ji-an Liu Open the ORCID record for Ji-an Liu [Opens in a new window] ,
Fanhao Zeng ,
Zhihuan Zou ,
Yi Li ,
Yi Gu ,
Fuqin Zhang  and
Tongxiang Liang
Ji-an Liu
Affiliation:
Science and Technology on High-Strength Structural Materials Laboratory, Central South University, Changsha 410083, China
Fanhao Zeng*
Affiliation:
Science and Technology on High-Strength Structural Materials Laboratory, Central South University, Changsha 410083, China
Zhihuan Zou
Affiliation:
Science and Technology on High-Strength Structural Materials Laboratory, Central South University, Changsha 410083, China
Yi Li
Affiliation:
Science and Technology on High-Strength Structural Materials Laboratory, Central South University, Changsha 410083, China
Yi Gu
Affiliation:
School of Materials Science and Engineering, Central South University, Changsha 410083, China
Fuqin Zhang
Affiliation:
Science and Technology on High-Strength Structural Materials Laboratory, Central South University, Changsha 410083, China
Tongxiang Liang
Affiliation:
State Key Laboratory of New Ceramic and Fine Processing, Tsinghua University, Beijing 100084, China
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Boron carbide (B4C) powder was consolidated at 45 MPa by Spark Plasma Sintering (SPS) for 20 min from 1450 to 2000 °C. The density of the B4C reached 99.6% at 2000 °C. A continuum model was applied to describe the densification mechanism of B4C powder under SPS conditions. The shrinkage rate was sensitive to particle size and temperature. The effect of porosity on thermal diffusion was significant, especially for small particle sizes. It appears that there is Joule heating, discharge, and electromagnetic field involved during the SPS of B4C. The current can enhance the sintering process, and it can obviously reduce the creep activation energy.

Keywords

simulationsinteringceramic
Type
Invited Articles
Information
Journal of Materials Research , Volume 32 , Issue 17: Focus Issue: Achieving Superior Ceramics and Coating Properties through Innovative Processing , 14 September 2017 , pp. 3425 - 3433
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Gary L. Messing

References

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