Discharge Enhancement Effect of Inorganic Nanometer Spark Plasma Sintering Aid

Abstract:

CaF₂ inorganic nanometer powder particles were used as sintering aid to sintering good conductive Fe-6.5Si alloy. By a physical method, CaF₂ inorganic nanopowder particles were made with a granularity of 15-30 nm assembled between micron-sized Fe-6.5Si powder particles prepared by gas atomization. 6.5 % Si high silicon steel were fabricated by spark plasma sintering (SPS) with varying contents of CaF₂. The discharge enhancement effect of CaF₂ inorganic nanospark plasma aid is confirmed. The initial sintering temperature and the final sintering temperature were decreased by 75 °C and 70 °C respectively with 0.5 % CaF₂ inorganic nanopowder aid. In the case of reduced 60 °C, the higher density for the particles with the addition of CaF₂ was observed compared with without CaF₂. When the nanopowder was 2%, sintering performance decreased. The study indicates that sintering pressure has an enormous effect on the Fe-6.5Si sintering effect.

• Periodical: Materials Science Forum (Volume 850)
• Pages: 829-834
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.850.829
• Online since: March 2016
• Authors: Hao Feng Li, Ming Gang Wang, Zhan Kui Zhao*
• Keywords: Discharge Enhancement Effect, Sintering Aid, Spark Plasma Sintering

References

[1] Z.A. Munir, D.V. Quach, M. Ohyanagi, Electric Current Activation of Sintering: A Review of the Pulsed Electric Current Sintering Process, J. Am. Ceram. Soc. 94(2011) 1-19.

DOI: 10.1111/j.1551-2916.2010.04210.x

[2] E.A. Olevsky, S. Kandukuri, L. Froyen, Consolidation enhancement in spark-plasma sintering: Impact of high heating rates, J. Appl. Phys. 102(2007) 114913.

DOI: 10.1063/1.2822189

[3] S.H. Risbud, Y. -H. Han, Preface and historical perspective on spark plasma sintering, Scr. Mater. 69 (2013) 105-106.

DOI: 10.1016/j.scriptamat.2013.02.024

[4] D.M. Hulbert, A. Anders, J. Andersson, E.J. Lavernia, A.K. Mukherjee, The absence of plasma in spark plasma sintering, Appl. Phys. 60(2009) 835-838.

DOI: 10.1016/j.scriptamat.2008.12.059

[5] U. Anselmi-Tamburini, S. Gennari, J. E. Garay, and Z. A. Munir, Fundamental investigations on the spark plasma sintering/synthesis process: II. Modeling of current and temperature distributions, Mater. Sci. Eng. A. 394(2005) 139–148.

DOI: 10.1016/j.msea.2004.11.019

[6] M. Omori, Sintering, consolidation, reaction and crystal growth by the spark plasma system (SPS), Mater. Sci. Eng. A. 287(2000) 183-188.

DOI: 10.1016/s0921-5093(00)00773-5

[7] G. -D. Zhan, J. Kuntz, J. Wan, J. Garay, and A. K. Mukherjee, Spark-plasma-sintered BaTiO3/Al2O3 nanocomposites, Mater. Sci. Eng. A. 356(2003) 443-446.

DOI: 10.1016/s0921-5093(02)00812-2

[8] X. Song, X. Liu, J. Zhang, Neck Formation and Self-Adjusting Mechanism of Neck Growth of Conducting Powders in Spark Plasma Sintering, J. Am. Ceram. Soc. 89(2006) 494-500.

DOI: 10.1111/j.1551-2916.2005.00777.x

[9] W. Chen, U. Anselmi-Tamburini, J.E. Garay, J.R. Groza, and Z.A. Munir, Fundamental investigations on the spark plasma sintering/synthesis process: I. Effect of dc pulsing on reactivity, Mater. Sci. Eng. A. 394(2005) 132-138.

DOI: 10.1016/j.msea.2004.11.020

[10] R. Chaim, Densification mechanisms in spark plasma sintering of nanocrystalline ceramics, Mater. Sci. Eng. A. 443(2007) 25-32.

DOI: 10.1016/j.msea.2008.02.031

[11] Y. Xiong , Z.Y. Fu, H. Wang, Y.C. Wang, Q.J. Zhang , Microstructure and IR transmittance of spark plasma sintering translucent AlN ceramics with CaF2 additive, Mat Sci. Eng. B. 123(2005) 57–62.

DOI: 10.1016/j.mseb.2005.06.023

[12] K.A. Khor, K.H. Cheng, L.G. Yu, F. Boey, Thermal conductivity and dielectric constant of spark plasma sintered aluminum nitride, Mat. Sci. Eng. A. 347(2003) 300-305.

DOI: 10.1016/s0921-5093(02)00601-9

[13] N. Chawake, L.D. Pinto, A. K. Srivastav, On Joule heating during spark plasma sintering of metal powders, Scr. Mater. 93(2014) 52–55.

DOI: 10.1016/j.scriptamat.2014.09.003